Convert string class names

Automated using git grep & sed.
Replace StringC classes with StringView classes.
Remove the CFX_ prefix and put string classes in fxcrt namespace.
Change AsStringC() to AsStringView().
Rename tests from TEST(fxcrt, *String*Foo) to TEST(*String*,
Foo).
Couple of tests needed to have their names regularlized.

BUG=pdfium:894

Change-Id: I7ca038685c8d803795f3ed02545124f7a224c83d
Reviewed-on: https://pdfium-review.googlesource.com/14151
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>

181 files changed, 2508 insertions, 2571 deletions

diff --git a/xfa/fde/cfde_texteditengine.cpp b/xfa/fde/cfde_texteditengine.cpp
index 9fc7990ca3..999380b401 100644
--- a/xfa/fde/cfde_texteditengine.cpp
+++ b/xfa/fde/cfde_texteditengine.cpp
@@ -38,7 +38,7 @@ class InsertOperation : public CFDE_TextEditEngine::Operation {
  public:
   InsertOperation(CFDE_TextEditEngine* engine,
                   size_t start_idx,
-                  const CFX_WideString& added_text)
+                  const WideString& added_text)
       : engine_(engine), start_idx_(start_idx), added_text_(added_text) {}
 
   ~InsertOperation() override {}
@@ -56,14 +56,14 @@ class InsertOperation : public CFDE_TextEditEngine::Operation {
  private:
   CFX_UnownedPtr<CFDE_TextEditEngine> engine_;
   size_t start_idx_;
-  CFX_WideString added_text_;
+  WideString added_text_;
 };
 
 class DeleteOperation : public CFDE_TextEditEngine::Operation {
  public:
   DeleteOperation(CFDE_TextEditEngine* engine,
                   size_t start_idx,
-                  const CFX_WideString& removed_text)
+                  const WideString& removed_text)
       : engine_(engine), start_idx_(start_idx), removed_text_(removed_text) {}
 
   ~DeleteOperation() override {}
@@ -81,15 +81,15 @@ class DeleteOperation : public CFDE_TextEditEngine::Operation {
  private:
   CFX_UnownedPtr<CFDE_TextEditEngine> engine_;
   size_t start_idx_;
-  CFX_WideString removed_text_;
+  WideString removed_text_;
 };
 
 class ReplaceOperation : public CFDE_TextEditEngine::Operation {
  public:
   ReplaceOperation(CFDE_TextEditEngine* engine,
                    size_t start_idx,
-                   const CFX_WideString& removed_text,
-                   const CFX_WideString& added_text)
+                   const WideString& removed_text,
+                   const WideString& added_text)
       : insert_op_(engine, start_idx, added_text),
         delete_op_(engine, start_idx, removed_text) {}
 
@@ -195,7 +195,7 @@ void CFDE_TextEditEngine::SetMaxEditOperationsForTesting(size_t max) {
 }
 
 void CFDE_TextEditEngine::AdjustGap(size_t idx, size_t length) {
-  static const size_t char_size = sizeof(CFX_WideString::CharType);
+  static const size_t char_size = sizeof(WideString::CharType);
 
   // Move the gap, if necessary.
   if (idx < gap_position_) {
@@ -222,7 +222,7 @@ void CFDE_TextEditEngine::AdjustGap(size_t idx, size_t length) {
   }
 }
 
-size_t CFDE_TextEditEngine::CountCharsExceedingSize(const CFX_WideString& text,
+size_t CFDE_TextEditEngine::CountCharsExceedingSize(const WideString& text,
                                                     size_t num_to_check) {
   if (!limit_horizontal_area_ && !limit_vertical_area_)
     return 0;
@@ -245,7 +245,7 @@ size_t CFDE_TextEditEngine::CountCharsExceedingSize(const CFX_WideString& text,
   text_out->SetStyles(style);
 
   size_t length = text.GetLength();
-  CFX_WideStringC temp(text.c_str(), length);
+  WideStringView temp(text.c_str(), length);
 
   float vertical_height = line_spacing_ * visible_line_count_;
   size_t chars_exceeding_size = 0;
@@ -253,7 +253,7 @@ size_t CFDE_TextEditEngine::CountCharsExceedingSize(const CFX_WideString& text,
   for (size_t i = 0; i < num_to_check; i++) {
     // This does a lot of string copying ....
     // TODO(dsinclair): make CalcLogicSize take a WideStringC instead.
-    text_out->CalcLogicSize(CFX_WideString(temp), text_rect);
+    text_out->CalcLogicSize(WideString(temp), text_rect);
 
     if (limit_horizontal_area_ && text_rect.width <= available_width_)
       break;
@@ -269,7 +269,7 @@ size_t CFDE_TextEditEngine::CountCharsExceedingSize(const CFX_WideString& text,
 }
 
 void CFDE_TextEditEngine::Insert(size_t idx,
-                                 const CFX_WideString& text,
+                                 const WideString& text,
                                  RecordOperation add_operation) {
   if (idx > text_length_)
     idx = text_length_;
@@ -289,15 +289,15 @@ void CFDE_TextEditEngine::Insert(size_t idx,
   AdjustGap(idx, length);
 
   if (validation_enabled_ || limit_horizontal_area_ || limit_vertical_area_) {
-    CFX_WideString str;
+    WideString str;
     if (gap_position_ > 0)
-      str += CFX_WideStringC(content_.data(), gap_position_);
+      str += WideStringView(content_.data(), gap_position_);
 
     str += text;
 
     if (text_length_ - gap_position_ > 0) {
-      str += CFX_WideStringC(content_.data() + gap_position_ + gap_size_,
-                             text_length_ - gap_position_);
+      str += WideStringView(content_.data() + gap_position_ + gap_size_,
+                            text_length_ - gap_position_);
     }
 
     if (validation_enabled_ && delegate_ && !delegate_->OnValidate(str)) {
@@ -328,12 +328,12 @@ void CFDE_TextEditEngine::Insert(size_t idx,
         pdfium::MakeUnique<InsertOperation>(this, gap_position_, text));
   }
 
-  CFX_WideString previous_text;
+  WideString previous_text;
   if (delegate_)
     previous_text = GetText();
 
   // Copy the new text into the gap.
-  static const size_t char_size = sizeof(CFX_WideString::CharType);
+  static const size_t char_size = sizeof(WideString::CharType);
   memcpy(content_.data() + gap_position_, text.c_str(), length * char_size);
   gap_position_ += length;
   gap_size_ -= length;
@@ -623,32 +623,32 @@ void CFDE_TextEditEngine::SetSelection(size_t start_idx, size_t end_idx) {
   selection_.end_idx = end_idx;
 }
 
-CFX_WideString CFDE_TextEditEngine::GetSelectedText() const {
+WideString CFDE_TextEditEngine::GetSelectedText() const {
   if (!has_selection_)
     return L"";
 
-  CFX_WideString text;
+  WideString text;
   if (selection_.start_idx < gap_position_) {
     if (selection_.end_idx < gap_position_) {
-      text += CFX_WideStringC(content_.data() + selection_.start_idx,
-                              selection_.end_idx - selection_.start_idx + 1);
+      text += WideStringView(content_.data() + selection_.start_idx,
+                             selection_.end_idx - selection_.start_idx + 1);
       return text;
     }
 
-    text += CFX_WideStringC(content_.data() + selection_.start_idx,
-                            gap_position_ - selection_.start_idx);
-    text += CFX_WideStringC(
+    text += WideStringView(content_.data() + selection_.start_idx,
+                           gap_position_ - selection_.start_idx);
+    text += WideStringView(
         content_.data() + gap_position_ + gap_size_,
         selection_.end_idx - (gap_position_ - selection_.start_idx) + 1);
     return text;
   }
 
-  text += CFX_WideStringC(content_.data() + gap_size_ + selection_.start_idx,
-                          selection_.end_idx - selection_.start_idx + 1);
+  text += WideStringView(content_.data() + gap_size_ + selection_.start_idx,
+                         selection_.end_idx - selection_.start_idx + 1);
   return text;
 }
 
-CFX_WideString CFDE_TextEditEngine::DeleteSelectedText(
+WideString CFDE_TextEditEngine::DeleteSelectedText(
     RecordOperation add_operation) {
   if (!has_selection_)
     return L"";
@@ -657,24 +657,24 @@ CFX_WideString CFDE_TextEditEngine::DeleteSelectedText(
                 selection_.end_idx - selection_.start_idx + 1, add_operation);
 }
 
-CFX_WideString CFDE_TextEditEngine::Delete(size_t start_idx,
-                                           size_t length,
-                                           RecordOperation add_operation) {
+WideString CFDE_TextEditEngine::Delete(size_t start_idx,
+                                       size_t length,
+                                       RecordOperation add_operation) {
   if (start_idx >= text_length_)
     return L"";
 
   length = std::min(length, text_length_ - start_idx);
   AdjustGap(start_idx + length, 0);
 
-  CFX_WideString ret;
-  ret += CFX_WideStringC(content_.data() + start_idx, length);
+  WideString ret;
+  ret += WideStringView(content_.data() + start_idx, length);
 
   if (add_operation == RecordOperation::kInsertRecord) {
     AddOperationRecord(
         pdfium::MakeUnique<DeleteOperation>(this, start_idx, ret));
   }
 
-  CFX_WideString previous_text = GetText();
+  WideString previous_text = GetText();
 
   gap_position_ = start_idx;
   gap_size_ += length;
@@ -688,23 +688,23 @@ CFX_WideString CFDE_TextEditEngine::Delete(size_t start_idx,
   return ret;
 }
 
-void CFDE_TextEditEngine::ReplaceSelectedText(const CFX_WideString& rep) {
+void CFDE_TextEditEngine::ReplaceSelectedText(const WideString& rep) {
   size_t start_idx = selection_.start_idx;
 
-  CFX_WideString txt = DeleteSelectedText(RecordOperation::kSkipRecord);
+  WideString txt = DeleteSelectedText(RecordOperation::kSkipRecord);
   Insert(gap_position_, rep, RecordOperation::kSkipRecord);
 
   AddOperationRecord(
       pdfium::MakeUnique<ReplaceOperation>(this, start_idx, txt, rep));
 }
 
-CFX_WideString CFDE_TextEditEngine::GetText() const {
-  CFX_WideString str;
+WideString CFDE_TextEditEngine::GetText() const {
+  WideString str;
   if (gap_position_ > 0)
-    str += CFX_WideStringC(content_.data(), gap_position_);
+    str += WideStringView(content_.data(), gap_position_);
   if (text_length_ - gap_position_ > 0) {
-    str += CFX_WideStringC(content_.data() + gap_position_ + gap_size_,
-                           text_length_ - gap_position_);
+    str += WideStringView(content_.data() + gap_position_ + gap_size_,
+                          text_length_ - gap_position_);
   }
   return str;
 }
diff --git a/xfa/fde/cfde_texteditengine.h b/xfa/fde/cfde_texteditengine.h
index aa8a24381d..750b62a2e1 100644
--- a/xfa/fde/cfde_texteditengine.h
+++ b/xfa/fde/cfde_texteditengine.h
@@ -66,9 +66,9 @@ class CFDE_TextEditEngine {
     virtual ~Delegate() = default;
     virtual void NotifyTextFull() = 0;
     virtual void OnCaretChanged() = 0;
-    virtual void OnTextChanged(const CFX_WideString& prevText) = 0;
+    virtual void OnTextChanged(const WideString& prevText) = 0;
     virtual void OnSelChanged() = 0;
-    virtual bool OnValidate(const CFX_WideString& wsText) = 0;
+    virtual bool OnValidate(const WideString& wsText) = 0;
     virtual void SetScrollOffset(float fScrollOffset) = 0;
   };
 
@@ -84,13 +84,13 @@ class CFDE_TextEditEngine {
   void Clear();
 
   void Insert(size_t idx,
-              const CFX_WideString& text,
+              const WideString& text,
               RecordOperation add_operation = RecordOperation::kInsertRecord);
-  CFX_WideString Delete(
+  WideString Delete(
       size_t start_idx,
       size_t length,
       RecordOperation add_operation = RecordOperation::kInsertRecord);
-  CFX_WideString GetText() const;
+  WideString GetText() const;
   size_t GetLength() const;
 
   // Non-const so we can force a layout.
@@ -147,10 +147,10 @@ class CFDE_TextEditEngine {
   std::pair<size_t, size_t> GetSelection() const {
     return {selection_.start_idx, selection_.end_idx};
   }
-  CFX_WideString GetSelectedText() const;
-  CFX_WideString DeleteSelectedText(
+  WideString GetSelectedText() const;
+  WideString DeleteSelectedText(
       RecordOperation add_operation = RecordOperation::kInsertRecord);
-  void ReplaceSelectedText(const CFX_WideString& str);
+  void ReplaceSelectedText(const WideString& str);
 
   void Layout();
 
@@ -183,8 +183,7 @@ class CFDE_TextEditEngine {
   void SetCombTextWidth();
   void AdjustGap(size_t idx, size_t length);
   void RebuildPieces();
-  size_t CountCharsExceedingSize(const CFX_WideString& str,
-                                 size_t num_to_check);
+  size_t CountCharsExceedingSize(const WideString& str, size_t num_to_check);
   void AddOperationRecord(std::unique_ptr<Operation> op);
 
   bool IsAlignedRight() const {
@@ -210,7 +209,7 @@ class CFDE_TextEditEngine {
   FX_ARGB font_color_;
   float font_size_;
   float line_spacing_;
-  std::vector<CFX_WideString::CharType> content_;
+  std::vector<WideString::CharType> content_;
   size_t text_length_;
   size_t gap_position_;
   size_t gap_size_;
diff --git a/xfa/fde/cfde_texteditengine_unittest.cpp b/xfa/fde/cfde_texteditengine_unittest.cpp
index 2084914bbf..48ed647945 100644
--- a/xfa/fde/cfde_texteditengine_unittest.cpp
+++ b/xfa/fde/cfde_texteditengine_unittest.cpp
@@ -20,9 +20,9 @@ class CFDE_TextEditEngineTest : public testing::Test {
     void NotifyTextFull() override { text_is_full = true; }
 
     void OnCaretChanged() override {}
-    void OnTextChanged(const CFX_WideString& prevText) override {}
+    void OnTextChanged(const WideString& prevText) override {}
     void OnSelChanged() override {}
-    bool OnValidate(const CFX_WideString& wsText) override {
+    bool OnValidate(const WideString& wsText) override {
       return !fail_validation;
     }
     void SetScrollOffset(float fScrollOffset) override {}
diff --git a/xfa/fde/cfde_textout.cpp b/xfa/fde/cfde_textout.cpp
index 7ccc9688da..3cf4ed36e0 100644
--- a/xfa/fde/cfde_textout.cpp
+++ b/xfa/fde/cfde_textout.cpp
@@ -191,13 +191,13 @@ void CFDE_TextOut::SetLineBreakTolerance(float fTolerance) {
   m_pTxtBreak->SetLineBreakTolerance(m_fTolerance);
 }
 
-void CFDE_TextOut::CalcLogicSize(const CFX_WideString& str, CFX_SizeF& size) {
+void CFDE_TextOut::CalcLogicSize(const WideString& str, CFX_SizeF& size) {
   CFX_RectF rtText(0.0f, 0.0f, size.width, size.height);
   CalcLogicSize(str, rtText);
   size = rtText.Size();
 }
 
-void CFDE_TextOut::CalcLogicSize(const CFX_WideString& str, CFX_RectF& rect) {
+void CFDE_TextOut::CalcLogicSize(const WideString& str, CFX_RectF& rect) {
   if (str.IsEmpty()) {
     rect.width = 0.0f;
     rect.height = 0.0f;
@@ -278,7 +278,7 @@ bool CFDE_TextOut::RetrieveLineWidth(CFX_BreakType dwBreakStatus,
 }
 
 void CFDE_TextOut::DrawLogicText(CFX_RenderDevice* device,
-                                 const CFX_WideStringC& str,
+                                 const WideStringView& str,
                                  const CFX_RectF& rect) {
   ASSERT(m_pFont && m_fFontSize >= 1.0f);
 
@@ -292,7 +292,7 @@ void CFDE_TextOut::DrawLogicText(CFX_RenderDevice* device,
   m_ttoLines.clear();
   m_wsText.clear();
 
-  LoadText(CFX_WideString(str), rect);
+  LoadText(WideString(str), rect);
   Reload(rect);
   DoAlignment(rect);
 
@@ -321,7 +321,7 @@ void CFDE_TextOut::DrawLogicText(CFX_RenderDevice* device,
   device->RestoreState(false);
 }
 
-void CFDE_TextOut::LoadText(const CFX_WideString& str, const CFX_RectF& rect) {
+void CFDE_TextOut::LoadText(const WideString& str, const CFX_RectF& rect) {
   ASSERT(!str.IsEmpty());
 
   m_wsText = str;
diff --git a/xfa/fde/cfde_textout.h b/xfa/fde/cfde_textout.h
index 89c8eac28d..b936eb4415 100644
--- a/xfa/fde/cfde_textout.h
+++ b/xfa/fde/cfde_textout.h
@@ -95,10 +95,10 @@ class CFDE_TextOut {
   void SetMatrix(const CFX_Matrix& matrix) { m_Matrix = matrix; }
   void SetLineBreakTolerance(float fTolerance);
 
-  void CalcLogicSize(const CFX_WideString& str, CFX_SizeF& size);
-  void CalcLogicSize(const CFX_WideString& str, CFX_RectF& rect);
+  void CalcLogicSize(const WideString& str, CFX_SizeF& size);
+  void CalcLogicSize(const WideString& str, CFX_RectF& rect);
   void DrawLogicText(CFX_RenderDevice* device,
-                     const CFX_WideStringC& str,
+                     const WideStringView& str,
                      const CFX_RectF& rect);
   int32_t GetTotalLines() const { return m_iTotalLines; }
 
@@ -107,7 +107,7 @@ class CFDE_TextOut {
                          float& fStartPos,
                          float& fWidth,
                          float& fHeight);
-  void LoadText(const CFX_WideString& str, const CFX_RectF& rect);
+  void LoadText(const WideString& str, const CFX_RectF& rect);
 
   void Reload(const CFX_RectF& rect);
   void ReloadLinePiece(CFDE_TTOLine* pLine, const CFX_RectF& rect);
@@ -131,7 +131,7 @@ class CFDE_TextOut {
   std::vector<int32_t> m_CharWidths;
   FX_ARGB m_TxtColor;
   uint32_t m_dwTxtBkStyles;
-  CFX_WideString m_wsText;
+  WideString m_wsText;
   CFX_Matrix m_Matrix;
   std::deque<CFDE_TTOLine> m_ttoLines;
   int32_t m_iCurLine;
diff --git a/xfa/fgas/crt/cfgas_formatstring.cpp b/xfa/fgas/crt/cfgas_formatstring.cpp
index df95a3588a..87b07691a4 100644
--- a/xfa/fgas/crt/cfgas_formatstring.cpp
+++ b/xfa/fgas/crt/cfgas_formatstring.cpp
@@ -97,10 +97,10 @@ int32_t ConvertHex(int32_t iKeyValue, wchar_t ch) {
   return iKeyValue;
 }
 
-CFX_WideString GetLiteralText(const wchar_t* pStrPattern,
-                              int32_t* iPattern,
-                              int32_t iLenPattern) {
-  CFX_WideString wsOutput;
+WideString GetLiteralText(const wchar_t* pStrPattern,
+                          int32_t* iPattern,
+                          int32_t iLenPattern) {
+  WideString wsOutput;
   if (pStrPattern[*iPattern] != '\'')
     return wsOutput;
 
@@ -135,9 +135,9 @@ CFX_WideString GetLiteralText(const wchar_t* pStrPattern,
   return wsOutput;
 }
 
-CFX_WideString GetLiteralTextReverse(const wchar_t* pStrPattern,
-                                     int32_t* iPattern) {
-  CFX_WideString wsOutput;
+WideString GetLiteralTextReverse(const wchar_t* pStrPattern,
+                                 int32_t* iPattern) {
+  WideString wsOutput;
   if (pStrPattern[*iPattern] != '\'')
     return wsOutput;
 
@@ -173,8 +173,8 @@ CFX_WideString GetLiteralTextReverse(const wchar_t* pStrPattern,
   return wsOutput;
 }
 
-bool GetNumericDotIndex(const CFX_WideString& wsNum,
-                        const CFX_WideString& wsDotSymbol,
+bool GetNumericDotIndex(const WideString& wsNum,
+                        const WideString& wsDotSymbol,
                         int32_t* iDotIndex) {
   int32_t ccf = 0;
   int32_t iLenf = wsNum.GetLength();
@@ -221,8 +221,8 @@ bool ExtractCountDigitsWithOptional(const wchar_t* str,
   return true;
 }
 
-bool ParseLocaleDate(const CFX_WideString& wsDate,
-                     const CFX_WideString& wsDatePattern,
+bool ParseLocaleDate(const WideString& wsDate,
+                     const WideString& wsDatePattern,
                      IFX_Locale* pLocale,
                      CFX_DateTime* datetime,
                      int32_t* cc) {
@@ -234,10 +234,10 @@ bool ParseLocaleDate(const CFX_WideString& wsDate,
   int32_t len = wsDate.GetLength();
   const wchar_t* strf = wsDatePattern.c_str();
   int32_t lenf = wsDatePattern.GetLength();
-  CFX_WideStringC wsDateSymbols(gs_wsDateSymbols);
+  WideStringView wsDateSymbols(gs_wsDateSymbols);
   while (*cc < len && ccf < lenf) {
     if (strf[ccf] == '\'') {
-      CFX_WideString wsLiteral = GetLiteralText(strf, &ccf, lenf);
+      WideString wsLiteral = GetLiteralText(strf, &ccf, lenf);
       int32_t iLiteralLen = wsLiteral.GetLength();
       if (*cc + iLiteralLen > len ||
           wcsncmp(str + *cc, wsLiteral.c_str(), iLiteralLen)) {
@@ -254,7 +254,7 @@ bool ParseLocaleDate(const CFX_WideString& wsDate,
       continue;
     }
 
-    CFX_WideString symbol;
+    WideString symbol;
     symbol.Reserve(4);
     symbol += strf[ccf++];
     while (ccf < lenf && strf[ccf] == symbol[0])
@@ -273,7 +273,7 @@ bool ParseLocaleDate(const CFX_WideString& wsDate,
         return false;
     } else if (symbol == L"MMM" || symbol == L"MMMM") {
       for (uint16_t i = 0; i < 12; i++) {
-        CFX_WideString wsMonthName = pLocale->GetMonthName(i, symbol == L"MMM");
+        WideString wsMonthName = pLocale->GetMonthName(i, symbol == L"MMM");
         if (wsMonthName.IsEmpty())
           continue;
         if (!wcsncmp(wsMonthName.c_str(), str + *cc, wsMonthName.GetLength())) {
@@ -284,7 +284,7 @@ bool ParseLocaleDate(const CFX_WideString& wsDate,
       }
     } else if (symbol == L"EEE" || symbol == L"EEEE") {
       for (uint16_t i = 0; i < 7; i++) {
-        CFX_WideString wsDayName = pLocale->GetDayName(i, symbol == L"EEE");
+        WideString wsDayName = pLocale->GetDayName(i, symbol == L"EEE");
         if (wsDayName.IsEmpty())
           continue;
         if (!wcsncmp(wsDayName.c_str(), str + *cc, wsDayName.GetLength())) {
@@ -338,8 +338,8 @@ void ResolveZone(FX_TIMEZONE tzDiff,
   *wMinute = iMinuteDiff % 60;
 }
 
-bool ParseLocaleTime(const CFX_WideString& wsTime,
-                     const CFX_WideString& wsTimePattern,
+bool ParseLocaleTime(const WideString& wsTime,
+                     const WideString& wsTimePattern,
                      IFX_Locale* pLocale,
                      CFX_DateTime* datetime,
                      int32_t* cc) {
@@ -354,10 +354,10 @@ bool ParseLocaleTime(const CFX_WideString& wsTime,
   int lenf = wsTimePattern.GetLength();
   bool bHasA = false;
   bool bPM = false;
-  CFX_WideStringC wsTimeSymbols(gs_wsTimeSymbols);
+  WideStringView wsTimeSymbols(gs_wsTimeSymbols);
   while (*cc < len && ccf < lenf) {
     if (strf[ccf] == '\'') {
-      CFX_WideString wsLiteral = GetLiteralText(strf, &ccf, lenf);
+      WideString wsLiteral = GetLiteralText(strf, &ccf, lenf);
       int32_t iLiteralLen = wsLiteral.GetLength();
       if (*cc + iLiteralLen > len ||
           wcsncmp(str + *cc, wsLiteral.c_str(), iLiteralLen)) {
@@ -375,7 +375,7 @@ bool ParseLocaleTime(const CFX_WideString& wsTime,
       continue;
     }
 
-    CFX_WideString symbol;
+    WideString symbol;
     symbol.Reserve(4);
     symbol += strf[ccf++];
     while (ccf < lenf && strf[ccf] == symbol[0])
@@ -415,16 +415,16 @@ bool ParseLocaleTime(const CFX_WideString& wsTime,
       if (!ExtractCountDigits(str, len, 3, cc, &millisecond))
         return false;
     } else if (symbol == L"A") {
-      CFX_WideString wsAM = pLocale->GetMeridiemName(true);
-      CFX_WideString wsPM = pLocale->GetMeridiemName(false);
+      WideString wsAM = pLocale->GetMeridiemName(true);
+      WideString wsPM = pLocale->GetMeridiemName(false);
       if ((*cc + pdfium::base::checked_cast<int32_t>(wsAM.GetLength()) <=
            len) &&
-          (CFX_WideStringC(str + *cc, wsAM.GetLength()) == wsAM)) {
+          (WideStringView(str + *cc, wsAM.GetLength()) == wsAM)) {
         *cc += wsAM.GetLength();
         bHasA = true;
       } else if ((*cc + pdfium::base::checked_cast<int32_t>(wsPM.GetLength()) <=
                   len) &&
-                 (CFX_WideStringC(str + *cc, wsPM.GetLength()) == wsPM)) {
+                 (WideStringView(str + *cc, wsPM.GetLength()) == wsPM)) {
         *cc += wsPM.GetLength();
         bHasA = true;
         bPM = true;
@@ -433,7 +433,7 @@ bool ParseLocaleTime(const CFX_WideString& wsTime,
       if (*cc + 3 > len)
         continue;
 
-      CFX_WideString tz(str[(*cc)++]);
+      WideString tz(str[(*cc)++]);
       tz += str[(*cc)++];
       tz += str[(*cc)++];
       if (tz == L"GMT") {
@@ -480,7 +480,7 @@ bool ParseLocaleTime(const CFX_WideString& wsTime,
   return !!(*cc);
 }
 
-int32_t GetNumTrailingLimit(const CFX_WideString& wsFormat,
+int32_t GetNumTrailingLimit(const WideString& wsFormat,
                             int iDotPos,
                             bool* bTrimTailZeros) {
   if (iDotPos < 0)
@@ -553,23 +553,23 @@ uint16_t GetWeekOfYear(uint16_t year, uint16_t month, uint16_t day) {
   return week_index;
 }
 
-CFX_WideString NumToString(size_t fmt_size, int32_t value) {
-  CFX_WideString str;
+WideString NumToString(size_t fmt_size, int32_t value) {
+  WideString str;
   str.Format(fmt_size == 1 ? L"%d" : fmt_size == 2 ? L"%02d" : L"%03d", value);
   return str;
 }
 
-CFX_WideString DateFormat(const CFX_WideString& wsDatePattern,
-                          IFX_Locale* pLocale,
-                          const CFX_DateTime& datetime) {
-  CFX_WideString wsResult;
+WideString DateFormat(const WideString& wsDatePattern,
+                      IFX_Locale* pLocale,
+                      const CFX_DateTime& datetime) {
+  WideString wsResult;
   int32_t year = datetime.GetYear();
   uint8_t month = datetime.GetMonth();
   uint8_t day = datetime.GetDay();
   int32_t ccf = 0;
   const wchar_t* strf = wsDatePattern.c_str();
   int32_t lenf = wsDatePattern.GetLength();
-  CFX_WideStringC wsDateSymbols(gs_wsDateSymbols);
+  WideStringView wsDateSymbols(gs_wsDateSymbols);
   while (ccf < lenf) {
     if (strf[ccf] == '\'') {
       wsResult += GetLiteralText(strf, &ccf, lenf);
@@ -581,7 +581,7 @@ CFX_WideString DateFormat(const CFX_WideString& wsDatePattern,
       continue;
     }
 
-    CFX_WideString symbol;
+    WideString symbol;
     symbol.Reserve(4);
     symbol += strf[ccf++];
     while (ccf < lenf && strf[ccf] == symbol[0])
@@ -621,10 +621,10 @@ CFX_WideString DateFormat(const CFX_WideString& wsDatePattern,
   return wsResult;
 }
 
-CFX_WideString TimeFormat(const CFX_WideString& wsTimePattern,
-                          IFX_Locale* pLocale,
-                          const CFX_DateTime& datetime) {
-  CFX_WideString wsResult;
+WideString TimeFormat(const WideString& wsTimePattern,
+                      IFX_Locale* pLocale,
+                      const CFX_DateTime& datetime) {
+  WideString wsResult;
   uint8_t hour = datetime.GetHour();
   uint8_t minute = datetime.GetMinute();
   uint8_t second = datetime.GetSecond();
@@ -639,7 +639,7 @@ CFX_WideString TimeFormat(const CFX_WideString& wsTimePattern,
       bPM = true;
   }
 
-  CFX_WideStringC wsTimeSymbols(gs_wsTimeSymbols);
+  WideStringView wsTimeSymbols(gs_wsTimeSymbols);
   while (ccf < lenf) {
     if (strf[ccf] == '\'') {
       wsResult += GetLiteralText(strf, &ccf, lenf);
@@ -651,7 +651,7 @@ CFX_WideString TimeFormat(const CFX_WideString& wsTimePattern,
       continue;
     }
 
-    CFX_WideString symbol;
+    WideString symbol;
     symbol.Reserve(4);
     symbol += strf[ccf++];
     while (ccf < lenf && strf[ccf] == symbol[0])
@@ -685,7 +685,7 @@ CFX_WideString TimeFormat(const CFX_WideString& wsTimePattern,
       if (tz.tzHour != 0 || tz.tzMinute != 0) {
         wsResult += tz.tzHour < 0 ? L"-" : L"+";
 
-        CFX_WideString wsTimezone;
+        WideString wsTimezone;
         wsTimezone.Format(L"%02d:%02d", abs(tz.tzHour), tz.tzMinute);
         wsResult += wsTimezone;
       }
@@ -694,16 +694,16 @@ CFX_WideString TimeFormat(const CFX_WideString& wsTimePattern,
   return wsResult;
 }
 
-CFX_WideString FormatDateTimeInternal(const CFX_DateTime& dt,
-                                      const CFX_WideString& wsDatePattern,
-                                      const CFX_WideString& wsTimePattern,
-                                      bool bDateFirst,
-                                      IFX_Locale* pLocale) {
-  CFX_WideString wsDateOut;
+WideString FormatDateTimeInternal(const CFX_DateTime& dt,
+                                  const WideString& wsDatePattern,
+                                  const WideString& wsTimePattern,
+                                  bool bDateFirst,
+                                  IFX_Locale* pLocale) {
+  WideString wsDateOut;
   if (!wsDatePattern.IsEmpty())
     wsDateOut = DateFormat(wsDatePattern, pLocale, dt);
 
-  CFX_WideString wsTimeOut;
+  WideString wsTimeOut;
   if (!wsTimePattern.IsEmpty())
     wsTimeOut = TimeFormat(wsTimePattern, pLocale, dt);
 
@@ -712,8 +712,7 @@ CFX_WideString FormatDateTimeInternal(const CFX_DateTime& dt,
 
 }  // namespace
 
-bool FX_DateFromCanonical(const CFX_WideString& wsDate,
-                          CFX_DateTime* datetime) {
+bool FX_DateFromCanonical(const WideString& wsDate, CFX_DateTime* datetime) {
   const wchar_t* str = wsDate.c_str();
   int len = wsDate.GetLength();
   if (len > 10)
@@ -762,7 +761,7 @@ bool FX_DateFromCanonical(const CFX_WideString& wsDate,
   return true;
 }
 
-bool FX_TimeFromCanonical(const CFX_WideStringC& wsTime,
+bool FX_TimeFromCanonical(const WideStringView& wsTime,
                           CFX_DateTime* datetime,
                           IFX_Locale* pLocale) {
   if (wsTime.GetLength() == 0)
@@ -840,8 +839,8 @@ CFGAS_FormatString::CFGAS_FormatString(CXFA_LocaleMgr* pLocaleMgr)
 CFGAS_FormatString::~CFGAS_FormatString() {}
 
 void CFGAS_FormatString::SplitFormatString(
-    const CFX_WideString& wsFormatString,
-    std::vector<CFX_WideString>* wsPatterns) {
+    const WideString& wsFormatString,
+    std::vector<WideString>* wsPatterns) {
   int32_t iStrLen = wsFormatString.GetLength();
   const wchar_t* pStr = wsFormatString.c_str();
   const wchar_t* pToken = pStr;
@@ -849,32 +848,31 @@ void CFGAS_FormatString::SplitFormatString(
   bool iQuote = false;
   while (true) {
     if (pStr >= pEnd) {
-      wsPatterns->push_back(CFX_WideString(pToken, pStr - pToken));
+      wsPatterns->push_back(WideString(pToken, pStr - pToken));
       return;
     }
     if (*pStr == '\'') {
       iQuote = !iQuote;
     } else if (*pStr == L'|' && !iQuote) {
-      wsPatterns->push_back(CFX_WideString(pToken, pStr - pToken));
+      wsPatterns->push_back(WideString(pToken, pStr - pToken));
       pToken = pStr + 1;
     }
     pStr++;
   }
 }
 
-FX_LOCALECATEGORY CFGAS_FormatString::GetCategory(
-    const CFX_WideString& wsPattern) {
+FX_LOCALECATEGORY CFGAS_FormatString::GetCategory(const WideString& wsPattern) {
   FX_LOCALECATEGORY eCategory = FX_LOCALECATEGORY_Unknown;
   int32_t ccf = 0;
   int32_t iLenf = wsPattern.GetLength();
   const wchar_t* pStr = wsPattern.c_str();
   bool bBraceOpen = false;
-  CFX_WideStringC wsConstChars(gs_wsConstChars);
+  WideStringView wsConstChars(gs_wsConstChars);
   while (ccf < iLenf) {
     if (pStr[ccf] == '\'') {
       GetLiteralText(pStr, &ccf, iLenf);
     } else if (!bBraceOpen && !wsConstChars.Contains(pStr[ccf])) {
-      CFX_WideString wsCategory(pStr[ccf]);
+      WideString wsCategory(pStr[ccf]);
       ccf++;
       while (true) {
         if (ccf == iLenf)
@@ -889,7 +887,7 @@ FX_LOCALECATEGORY CFGAS_FormatString::GetCategory(
         ccf++;
       }
 
-      uint32_t dwHash = FX_HashCode_GetW(wsCategory.AsStringC(), false);
+      uint32_t dwHash = FX_HashCode_GetW(wsCategory.AsStringView(), false);
       if (dwHash == FX_LOCALECATEGORY_DateHash) {
         if (eCategory == FX_LOCALECATEGORY_Time)
           return FX_LOCALECATEGORY_DateTime;
@@ -917,22 +915,21 @@ FX_LOCALECATEGORY CFGAS_FormatString::GetCategory(
   return eCategory;
 }
 
-CFX_WideString CFGAS_FormatString::GetTextFormat(
-    const CFX_WideString& wsPattern,
-    const CFX_WideStringC& wsCategory) {
+WideString CFGAS_FormatString::GetTextFormat(const WideString& wsPattern,
+                                             const WideStringView& wsCategory) {
   int32_t ccf = 0;
   int32_t iLenf = wsPattern.GetLength();
   const wchar_t* pStr = wsPattern.c_str();
   bool bBrackOpen = false;
-  CFX_WideStringC wsConstChars(gs_wsConstChars);
-  CFX_WideString wsPurgePattern;
+  WideStringView wsConstChars(gs_wsConstChars);
+  WideString wsPurgePattern;
   while (ccf < iLenf) {
     if (pStr[ccf] == '\'') {
       int32_t iCurChar = ccf;
       GetLiteralText(pStr, &ccf, iLenf);
-      wsPurgePattern += CFX_WideStringC(pStr + iCurChar, ccf - iCurChar + 1);
+      wsPurgePattern += WideStringView(pStr + iCurChar, ccf - iCurChar + 1);
     } else if (!bBrackOpen && !wsConstChars.Contains(pStr[ccf])) {
-      CFX_WideString wsSearchCategory(pStr[ccf]);
+      WideString wsSearchCategory(pStr[ccf]);
       ccf++;
       while (ccf < iLenf && pStr[ccf] != '{' && pStr[ccf] != '.' &&
              pStr[ccf] != '(') {
@@ -965,11 +962,10 @@ CFX_WideString CFGAS_FormatString::GetTextFormat(
   return wsPurgePattern;
 }
 
-IFX_Locale* CFGAS_FormatString::GetNumericFormat(
-    const CFX_WideString& wsPattern,
-    int32_t* iDotIndex,
-    uint32_t* dwStyle,
-    CFX_WideString* wsPurgePattern) {
+IFX_Locale* CFGAS_FormatString::GetNumericFormat(const WideString& wsPattern,
+                                                 int32_t* iDotIndex,
+                                                 uint32_t* dwStyle,
+                                                 WideString* wsPurgePattern) {
   *dwStyle = 0;
   IFX_Locale* pLocale = nullptr;
   int32_t ccf = 0;
@@ -977,14 +973,14 @@ IFX_Locale* CFGAS_FormatString::GetNumericFormat(
   const wchar_t* pStr = wsPattern.c_str();
   bool bFindDot = false;
   bool bBrackOpen = false;
-  CFX_WideStringC wsConstChars(gs_wsConstChars);
+  WideStringView wsConstChars(gs_wsConstChars);
   while (ccf < iLenf) {
     if (pStr[ccf] == '\'') {
       int32_t iCurChar = ccf;
       GetLiteralText(pStr, &ccf, iLenf);
-      *wsPurgePattern += CFX_WideStringC(pStr + iCurChar, ccf - iCurChar + 1);
+      *wsPurgePattern += WideStringView(pStr + iCurChar, ccf - iCurChar + 1);
     } else if (!bBrackOpen && !wsConstChars.Contains(pStr[ccf])) {
-      CFX_WideString wsCategory(pStr[ccf]);
+      WideString wsCategory(pStr[ccf]);
       ccf++;
       while (ccf < iLenf && pStr[ccf] != '{' && pStr[ccf] != '.' &&
              pStr[ccf] != '(') {
@@ -999,7 +995,7 @@ IFX_Locale* CFGAS_FormatString::GetNumericFormat(
       while (ccf < iLenf) {
         if (pStr[ccf] == '(') {
           ccf++;
-          CFX_WideString wsLCID;
+          WideString wsLCID;
           while (ccf < iLenf && pStr[ccf] != ')')
             wsLCID += pStr[ccf++];
 
@@ -1008,13 +1004,13 @@ IFX_Locale* CFGAS_FormatString::GetNumericFormat(
           bBrackOpen = true;
           break;
         } else if (pStr[ccf] == '.') {
-          CFX_WideString wsSubCategory;
+          WideString wsSubCategory;
           ccf++;
           while (ccf < iLenf && pStr[ccf] != '(' && pStr[ccf] != '{')
             wsSubCategory += pStr[ccf++];
 
           uint32_t dwSubHash =
-              FX_HashCode_GetW(wsSubCategory.AsStringC(), false);
+              FX_HashCode_GetW(wsSubCategory.AsStringView(), false);
           FX_LOCALENUMSUBCATEGORY eSubCategory = FX_LOCALENUMPATTERN_Decimal;
           for (int32_t i = 0; i < g_iFXLocaleNumSubCatCount; i++) {
             if (g_FXLocaleNumSubCatData[i].uHash == dwSubHash) {
@@ -1068,14 +1064,14 @@ IFX_Locale* CFGAS_FormatString::GetNumericFormat(
   return pLocale;
 }
 
-bool CFGAS_FormatString::ParseText(const CFX_WideString& wsSrcText,
-                                   const CFX_WideString& wsPattern,
-                                   CFX_WideString* wsValue) {
+bool CFGAS_FormatString::ParseText(const WideString& wsSrcText,
+                                   const WideString& wsPattern,
+                                   WideString* wsValue) {
   wsValue->clear();
   if (wsSrcText.IsEmpty() || wsPattern.IsEmpty())
     return false;
 
-  CFX_WideString wsTextFormat = GetTextFormat(wsPattern, L"text");
+  WideString wsTextFormat = GetTextFormat(wsPattern, L"text");
   if (wsTextFormat.IsEmpty())
     return false;
 
@@ -1088,7 +1084,7 @@ bool CFGAS_FormatString::ParseText(const CFX_WideString& wsSrcText,
   while (iPattern < iLenPattern && iText < iLenText) {
     switch (pStrPattern[iPattern]) {
       case '\'': {
-        CFX_WideString wsLiteral =
+        WideString wsLiteral =
             GetLiteralText(pStrPattern, &iPattern, iLenPattern);
         int32_t iLiteralLen = wsLiteral.GetLength();
         if (iText + iLiteralLen > iLenText ||
@@ -1141,28 +1137,28 @@ bool CFGAS_FormatString::ParseText(const CFX_WideString& wsSrcText,
   return iPattern == iLenPattern && iText == iLenText;
 }
 
-bool CFGAS_FormatString::ParseNum(const CFX_WideString& wsSrcNum,
-                                  const CFX_WideString& wsPattern,
-                                  CFX_WideString* wsValue) {
+bool CFGAS_FormatString::ParseNum(const WideString& wsSrcNum,
+                                  const WideString& wsPattern,
+                                  WideString* wsValue) {
   wsValue->clear();
   if (wsSrcNum.IsEmpty() || wsPattern.IsEmpty())
     return false;
 
   int32_t dot_index_f = -1;
   uint32_t dwFormatStyle = 0;
-  CFX_WideString wsNumFormat;
+  WideString wsNumFormat;
   IFX_Locale* pLocale =
       GetNumericFormat(wsPattern, &dot_index_f, &dwFormatStyle, &wsNumFormat);
   if (!pLocale || wsNumFormat.IsEmpty())
     return false;
 
   int32_t iExponent = 0;
-  CFX_WideString wsDotSymbol =
+  WideString wsDotSymbol =
       pLocale->GetNumbericSymbol(FX_LOCALENUMSYMBOL_Decimal);
-  CFX_WideString wsGroupSymbol =
+  WideString wsGroupSymbol =
       pLocale->GetNumbericSymbol(FX_LOCALENUMSYMBOL_Grouping);
   int32_t iGroupLen = wsGroupSymbol.GetLength();
-  CFX_WideString wsMinus = pLocale->GetNumbericSymbol(FX_LOCALENUMSYMBOL_Minus);
+  WideString wsMinus = pLocale->GetNumbericSymbol(FX_LOCALENUMSYMBOL_Minus);
   int32_t iMinusLen = wsMinus.GetLength();
   const wchar_t* str = wsSrcNum.c_str();
   int len = wsSrcNum.GetLength();
@@ -1192,7 +1188,7 @@ bool CFGAS_FormatString::ParseNum(const CFX_WideString& wsSrcNum,
   while (ccf >= 0 && cc >= 0) {
     switch (strf[ccf]) {
       case '\'': {
-        CFX_WideString wsLiteral = GetLiteralTextReverse(strf, &ccf);
+        WideString wsLiteral = GetLiteralTextReverse(strf, &ccf);
         int32_t iLiteralLen = wsLiteral.GetLength();
         cc -= iLiteralLen - 1;
         if (cc < 0 || wcsncmp(str + cc, wsLiteral.c_str(), iLiteralLen))
@@ -1265,7 +1261,7 @@ bool CFGAS_FormatString::ParseNum(const CFX_WideString& wsSrcNum,
         break;
       }
       case '$': {
-        CFX_WideString wsSymbol =
+        WideString wsSymbol =
             pLocale->GetNumbericSymbol(FX_LOCALENUMSYMBOL_CurrencySymbol);
         int32_t iSymbolLen = wsSymbol.GetLength();
         cc -= iSymbolLen - 1;
@@ -1307,7 +1303,7 @@ bool CFGAS_FormatString::ParseNum(const CFX_WideString& wsSrcNum,
         }
         break;
       case '%': {
-        CFX_WideString wsSymbol =
+        WideString wsSymbol =
             pLocale->GetNumbericSymbol(FX_LOCALENUMSYMBOL_Percent);
         int32_t iSysmbolLen = wsSymbol.GetLength();
         cc -= iSysmbolLen - 1;
@@ -1371,7 +1367,7 @@ bool CFGAS_FormatString::ParseNum(const CFX_WideString& wsSrcNum,
     while (cc < len && ccf < lenf) {
       switch (strf[ccf]) {
         case '\'': {
-          CFX_WideString wsLiteral = GetLiteralText(strf, &ccf, lenf);
+          WideString wsLiteral = GetLiteralText(strf, &ccf, lenf);
           int32_t iLiteralLen = wsLiteral.GetLength();
           if (cc + iLiteralLen > len ||
               wcsncmp(str + cc, wsLiteral.c_str(), iLiteralLen)) {
@@ -1441,7 +1437,7 @@ bool CFGAS_FormatString::ParseNum(const CFX_WideString& wsSrcNum,
           break;
         }
         case '$': {
-          CFX_WideString wsSymbol =
+          WideString wsSymbol =
               pLocale->GetNumbericSymbol(FX_LOCALENUMSYMBOL_CurrencySymbol);
           int32_t iSymbolLen = wsSymbol.GetLength();
           if (cc + iSymbolLen > len ||
@@ -1483,7 +1479,7 @@ bool CFGAS_FormatString::ParseNum(const CFX_WideString& wsSrcNum,
         case 'v':
           return false;
         case '%': {
-          CFX_WideString wsSymbol =
+          WideString wsSymbol =
               pLocale->GetNumbericSymbol(FX_LOCALENUMSYMBOL_Percent);
           int32_t iSysmbolLen = wsSymbol.GetLength();
           if (cc + iSysmbolLen <= len &&
@@ -1532,7 +1528,7 @@ bool CFGAS_FormatString::ParseNum(const CFX_WideString& wsSrcNum,
       return false;
   }
   if (iExponent || bHavePercentSymbol) {
-    CFX_Decimal decimal = CFX_Decimal(wsValue->AsStringC());
+    CFX_Decimal decimal = CFX_Decimal(wsValue->AsStringView());
     if (iExponent) {
       decimal = decimal *
                 CFX_Decimal(FXSYS_pow(10, static_cast<float>(iExponent)), 3);
@@ -1549,27 +1545,27 @@ bool CFGAS_FormatString::ParseNum(const CFX_WideString& wsSrcNum,
 }
 
 FX_DATETIMETYPE CFGAS_FormatString::GetDateTimeFormat(
-    const CFX_WideString& wsPattern,
+    const WideString& wsPattern,
     IFX_Locale** pLocale,
-    CFX_WideString* wsDatePattern,
-    CFX_WideString* wsTimePattern) {
+    WideString* wsDatePattern,
+    WideString* wsTimePattern) {
   *pLocale = nullptr;
-  CFX_WideString wsTempPattern;
+  WideString wsTempPattern;
   FX_LOCALECATEGORY eCategory = FX_LOCALECATEGORY_Unknown;
   int32_t ccf = 0;
   int32_t iLenf = wsPattern.GetLength();
   const wchar_t* pStr = wsPattern.c_str();
   int32_t iFindCategory = 0;
   bool bBraceOpen = false;
-  CFX_WideStringC wsConstChars(gs_wsConstChars);
+  WideStringView wsConstChars(gs_wsConstChars);
   while (ccf < iLenf) {
     if (pStr[ccf] == '\'') {
       int32_t iCurChar = ccf;
       GetLiteralText(pStr, &ccf, iLenf);
-      wsTempPattern += CFX_WideStringC(pStr + iCurChar, ccf - iCurChar + 1);
+      wsTempPattern += WideStringView(pStr + iCurChar, ccf - iCurChar + 1);
     } else if (!bBraceOpen && iFindCategory != 3 &&
                !wsConstChars.Contains(pStr[ccf])) {
-      CFX_WideString wsCategory(pStr[ccf]);
+      WideString wsCategory(pStr[ccf]);
       ccf++;
       while (ccf < iLenf && pStr[ccf] != '{' && pStr[ccf] != '.' &&
              pStr[ccf] != '(') {
@@ -1602,7 +1598,7 @@ FX_DATETIMETYPE CFGAS_FormatString::GetDateTimeFormat(
       while (ccf < iLenf) {
         if (pStr[ccf] == '(') {
           ccf++;
-          CFX_WideString wsLCID;
+          WideString wsLCID;
           while (ccf < iLenf && pStr[ccf] != ')')
             wsLCID += pStr[ccf++];
 
@@ -1611,13 +1607,13 @@ FX_DATETIMETYPE CFGAS_FormatString::GetDateTimeFormat(
           bBraceOpen = true;
           break;
         } else if (pStr[ccf] == '.') {
-          CFX_WideString wsSubCategory;
+          WideString wsSubCategory;
           ccf++;
           while (ccf < iLenf && pStr[ccf] != '(' && pStr[ccf] != '{')
             wsSubCategory += pStr[ccf++];
 
           uint32_t dwSubHash =
-              FX_HashCode_GetW(wsSubCategory.AsStringC(), false);
+              FX_HashCode_GetW(wsSubCategory.AsStringView(), false);
           FX_LOCALEDATETIMESUBCATEGORY eSubCategory =
               FX_LOCALEDATETIMESUBCATEGORY_Medium;
           for (int32_t i = 0; i < g_iFXLocaleDateTimeSubCatCount; i++) {
@@ -1685,16 +1681,16 @@ FX_DATETIMETYPE CFGAS_FormatString::GetDateTimeFormat(
   return (FX_DATETIMETYPE)iFindCategory;
 }
 
-bool CFGAS_FormatString::ParseDateTime(const CFX_WideString& wsSrcDateTime,
-                                       const CFX_WideString& wsPattern,
+bool CFGAS_FormatString::ParseDateTime(const WideString& wsSrcDateTime,
+                                       const WideString& wsPattern,
                                        FX_DATETIMETYPE eDateTimeType,
                                        CFX_DateTime* dtValue) {
   dtValue->Reset();
   if (wsSrcDateTime.IsEmpty() || wsPattern.IsEmpty())
     return false;
 
-  CFX_WideString wsDatePattern;
-  CFX_WideString wsTimePattern;
+  WideString wsDatePattern;
+  WideString wsTimePattern;
   IFX_Locale* pLocale = nullptr;
   FX_DATETIMETYPE eCategory =
       GetDateTimeFormat(wsPattern, &pLocale, &wsDatePattern, &wsTimePattern);
@@ -1730,9 +1726,9 @@ bool CFGAS_FormatString::ParseDateTime(const CFX_WideString& wsSrcDateTime,
   return true;
 }
 
-bool CFGAS_FormatString::ParseZero(const CFX_WideString& wsSrcText,
-                                   const CFX_WideString& wsPattern) {
-  CFX_WideString wsTextFormat = GetTextFormat(wsPattern, L"zero");
+bool CFGAS_FormatString::ParseZero(const WideString& wsSrcText,
+                                   const WideString& wsPattern) {
+  WideString wsTextFormat = GetTextFormat(wsPattern, L"zero");
 
   int32_t iText = 0;
   int32_t iPattern = 0;
@@ -1742,7 +1738,7 @@ bool CFGAS_FormatString::ParseZero(const CFX_WideString& wsSrcText,
   int32_t iLenPattern = wsTextFormat.GetLength();
   while (iPattern < iLenPattern && iText < iLenText) {
     if (pStrPattern[iPattern] == '\'') {
-      CFX_WideString wsLiteral =
+      WideString wsLiteral =
           GetLiteralText(pStrPattern, &iPattern, iLenPattern);
       int32_t iLiteralLen = wsLiteral.GetLength();
       if (iText + iLiteralLen > iLenText ||
@@ -1762,9 +1758,9 @@ bool CFGAS_FormatString::ParseZero(const CFX_WideString& wsSrcText,
   return iPattern == iLenPattern && iText == iLenText;
 }
 
-bool CFGAS_FormatString::ParseNull(const CFX_WideString& wsSrcText,
-                                   const CFX_WideString& wsPattern) {
-  CFX_WideString wsTextFormat = GetTextFormat(wsPattern, L"null");
+bool CFGAS_FormatString::ParseNull(const WideString& wsSrcText,
+                                   const WideString& wsPattern) {
+  WideString wsTextFormat = GetTextFormat(wsPattern, L"null");
 
   int32_t iText = 0;
   int32_t iPattern = 0;
@@ -1774,7 +1770,7 @@ bool CFGAS_FormatString::ParseNull(const CFX_WideString& wsSrcText,
   int32_t iLenPattern = wsTextFormat.GetLength();
   while (iPattern < iLenPattern && iText < iLenText) {
     if (pStrPattern[iPattern] == '\'') {
-      CFX_WideString wsLiteral =
+      WideString wsLiteral =
           GetLiteralText(pStrPattern, &iPattern, iLenPattern);
       int32_t iLiteralLen = wsLiteral.GetLength();
       if (iText + iLiteralLen > iLenText ||
@@ -1794,9 +1790,9 @@ bool CFGAS_FormatString::ParseNull(const CFX_WideString& wsSrcText,
   return iPattern == iLenPattern && iText == iLenText;
 }
 
-bool CFGAS_FormatString::FormatText(const CFX_WideString& wsSrcText,
-                                    const CFX_WideString& wsPattern,
-                                    CFX_WideString* wsOutput) {
+bool CFGAS_FormatString::FormatText(const WideString& wsSrcText,
+                                    const WideString& wsPattern,
+                                    WideString* wsOutput) {
   if (wsPattern.IsEmpty())
     return false;
 
@@ -1804,7 +1800,7 @@ bool CFGAS_FormatString::FormatText(const CFX_WideString& wsSrcText,
   if (iLenText == 0)
     return false;
 
-  CFX_WideString wsTextFormat = GetTextFormat(wsPattern, L"text");
+  WideString wsTextFormat = GetTextFormat(wsPattern, L"text");
 
   int32_t iText = 0;
   int32_t iPattern = 0;
@@ -1856,15 +1852,15 @@ bool CFGAS_FormatString::FormatText(const CFX_WideString& wsSrcText,
   return iText == iLenText;
 }
 
-bool CFGAS_FormatString::FormatStrNum(const CFX_WideStringC& wsInputNum,
-                                      const CFX_WideString& wsPattern,
-                                      CFX_WideString* wsOutput) {
+bool CFGAS_FormatString::FormatStrNum(const WideStringView& wsInputNum,
+                                      const WideString& wsPattern,
+                                      WideString* wsOutput) {
   if (wsInputNum.IsEmpty() || wsPattern.IsEmpty())
     return false;
 
   int32_t dot_index_f = -1;
   uint32_t dwNumStyle = 0;
-  CFX_WideString wsNumFormat;
+  WideString wsNumFormat;
   IFX_Locale* pLocale =
       GetNumericFormat(wsPattern, &dot_index_f, &dwNumStyle, &wsNumFormat);
   if (!pLocale || wsNumFormat.IsEmpty())
@@ -1873,12 +1869,12 @@ bool CFGAS_FormatString::FormatStrNum(const CFX_WideStringC& wsInputNum,
   int32_t cc = 0, ccf = 0;
   const wchar_t* strf = wsNumFormat.c_str();
   int lenf = wsNumFormat.GetLength();
-  CFX_WideString wsSrcNum(wsInputNum);
+  WideString wsSrcNum(wsInputNum);
   wsSrcNum.TrimLeft('0');
   if (wsSrcNum.IsEmpty() || wsSrcNum[0] == '.')
     wsSrcNum.InsertAtFront('0');
 
-  CFX_Decimal decimal = CFX_Decimal(wsSrcNum.AsStringC());
+  CFX_Decimal decimal = CFX_Decimal(wsSrcNum.AsStringView());
   if (dwNumStyle & FX_NUMSTYLE_Percent) {
     decimal = decimal * CFX_Decimal(100);
     wsSrcNum = decimal;
@@ -1937,7 +1933,7 @@ bool CFGAS_FormatString::FormatStrNum(const CFX_WideStringC& wsInputNum,
     wsSrcNum.TrimRight(L".");
   }
 
-  CFX_WideString wsGroupSymbol =
+  WideString wsGroupSymbol =
       pLocale->GetNumbericSymbol(FX_LOCALENUMSYMBOL_Grouping);
   bool bNeg = false;
   if (wsSrcNum[0] == '-') {
@@ -2010,7 +2006,7 @@ bool CFGAS_FormatString::FormatStrNum(const CFX_WideStringC& wsInputNum,
         ccf--;
         break;
       case 'E': {
-        CFX_WideString wsExp;
+        WideString wsExp;
         wsExp.Format(L"E%+d", exponent);
         *wsOutput = wsExp + *wsOutput;
         ccf--;
@@ -2114,7 +2110,7 @@ bool CFGAS_FormatString::FormatStrNum(const CFX_WideStringC& wsInputNum,
     return true;
   }
 
-  CFX_WideString wsDotSymbol =
+  WideString wsDotSymbol =
       pLocale->GetNumbericSymbol(FX_LOCALENUMSYMBOL_Decimal);
   if (strf[dot_index_f] == 'V') {
     *wsOutput += wsDotSymbol;
@@ -2168,7 +2164,7 @@ bool CFGAS_FormatString::FormatStrNum(const CFX_WideStringC& wsInputNum,
         ccf++;
         break;
       case 'E': {
-        CFX_WideString wsExp;
+        WideString wsExp;
         wsExp.Format(L"E%+d", exponent);
         *wsOutput += wsExp;
         ccf++;
@@ -2247,23 +2243,23 @@ bool CFGAS_FormatString::FormatStrNum(const CFX_WideStringC& wsInputNum,
   return true;
 }
 
-bool CFGAS_FormatString::FormatNum(const CFX_WideString& wsSrcNum,
-                                   const CFX_WideString& wsPattern,
-                                   CFX_WideString* wsOutput) {
+bool CFGAS_FormatString::FormatNum(const WideString& wsSrcNum,
+                                   const WideString& wsPattern,
+                                   WideString* wsOutput) {
   if (wsSrcNum.IsEmpty() || wsPattern.IsEmpty())
     return false;
-  return FormatStrNum(wsSrcNum.AsStringC(), wsPattern, wsOutput);
+  return FormatStrNum(wsSrcNum.AsStringView(), wsPattern, wsOutput);
 }
 
-bool CFGAS_FormatString::FormatDateTime(const CFX_WideString& wsSrcDateTime,
-                                        const CFX_WideString& wsPattern,
+bool CFGAS_FormatString::FormatDateTime(const WideString& wsSrcDateTime,
+                                        const WideString& wsPattern,
                                         FX_DATETIMETYPE eDateTimeType,
-                                        CFX_WideString* wsOutput) {
+                                        WideString* wsOutput) {
   if (wsSrcDateTime.IsEmpty() || wsPattern.IsEmpty())
     return false;
 
-  CFX_WideString wsDatePattern;
-  CFX_WideString wsTimePattern;
+  WideString wsDatePattern;
+  WideString wsTimePattern;
   IFX_Locale* pLocale = nullptr;
   FX_DATETIMETYPE eCategory =
       GetDateTimeFormat(wsPattern, &pLocale, &wsDatePattern, &wsTimePattern);
@@ -2290,15 +2286,15 @@ bool CFGAS_FormatString::FormatDateTime(const CFX_WideString& wsSrcDateTime,
       return true;
     }
     if (eCategory == FX_DATETIMETYPE_Time &&
-        FX_TimeFromCanonical(wsSrcDateTime.AsStringC(), &dt, pLocale)) {
+        FX_TimeFromCanonical(wsSrcDateTime.AsStringView(), &dt, pLocale)) {
       *wsOutput = FormatDateTimeInternal(dt, wsDatePattern, wsTimePattern, true,
                                          pLocale);
       return true;
     }
   } else {
-    CFX_WideString wsSrcDate(wsSrcDateTime.c_str(), iT.value());
-    CFX_WideStringC wsSrcTime(wsSrcDateTime.c_str() + iT.value() + 1,
-                              wsSrcDateTime.GetLength() - iT.value() - 1);
+    WideString wsSrcDate(wsSrcDateTime.c_str(), iT.value());
+    WideStringView wsSrcTime(wsSrcDateTime.c_str() + iT.value() + 1,
+                             wsSrcDateTime.GetLength() - iT.value() - 1);
     if (wsSrcDate.IsEmpty() || wsSrcTime.IsEmpty())
       return false;
     if (FX_DateFromCanonical(wsSrcDate, &dt) &&
@@ -2312,12 +2308,12 @@ bool CFGAS_FormatString::FormatDateTime(const CFX_WideString& wsSrcDateTime,
   return false;
 }
 
-bool CFGAS_FormatString::FormatZero(const CFX_WideString& wsPattern,
-                                    CFX_WideString* wsOutput) {
+bool CFGAS_FormatString::FormatZero(const WideString& wsPattern,
+                                    WideString* wsOutput) {
   if (wsPattern.IsEmpty())
     return false;
 
-  CFX_WideString wsTextFormat = GetTextFormat(wsPattern, L"zero");
+  WideString wsTextFormat = GetTextFormat(wsPattern, L"zero");
   int32_t iPattern = 0;
   const wchar_t* pStrPattern = wsTextFormat.c_str();
   int32_t iLenPattern = wsTextFormat.GetLength();
@@ -2334,12 +2330,12 @@ bool CFGAS_FormatString::FormatZero(const CFX_WideString& wsPattern,
   return true;
 }
 
-bool CFGAS_FormatString::FormatNull(const CFX_WideString& wsPattern,
-                                    CFX_WideString* wsOutput) {
+bool CFGAS_FormatString::FormatNull(const WideString& wsPattern,
+                                    WideString* wsOutput) {
   if (wsPattern.IsEmpty())
     return false;
 
-  CFX_WideString wsTextFormat = GetTextFormat(wsPattern, L"null");
+  WideString wsTextFormat = GetTextFormat(wsPattern, L"null");
   int32_t iPattern = 0;
   const wchar_t* pStrPattern = wsTextFormat.c_str();
   int32_t iLenPattern = wsTextFormat.GetLength();
diff --git a/xfa/fgas/crt/cfgas_formatstring.h b/xfa/fgas/crt/cfgas_formatstring.h
index c91f43598e..5eae25dca5 100644
--- a/xfa/fgas/crt/cfgas_formatstring.h
+++ b/xfa/fgas/crt/cfgas_formatstring.h
@@ -12,8 +12,8 @@
 #include "core/fxcrt/ifx_locale.h"
 #include "xfa/fxfa/parser/cxfa_localemgr.h"
 
-bool FX_DateFromCanonical(const CFX_WideString& wsDate, CFX_DateTime* datetime);
-bool FX_TimeFromCanonical(const CFX_WideStringC& wsTime,
+bool FX_DateFromCanonical(const WideString& wsDate, CFX_DateTime* datetime);
+bool FX_TimeFromCanonical(const WideStringView& wsTime,
                           CFX_DateTime* datetime,
                           IFX_Locale* pLocale);
 
@@ -22,52 +22,50 @@ class CFGAS_FormatString {
   explicit CFGAS_FormatString(CXFA_LocaleMgr* pLocaleMgr);
   ~CFGAS_FormatString();
 
-  void SplitFormatString(const CFX_WideString& wsFormatString,
-                         std::vector<CFX_WideString>* wsPatterns);
-  FX_LOCALECATEGORY GetCategory(const CFX_WideString& wsPattern);
+  void SplitFormatString(const WideString& wsFormatString,
+                         std::vector<WideString>* wsPatterns);
+  FX_LOCALECATEGORY GetCategory(const WideString& wsPattern);
 
-  bool ParseText(const CFX_WideString& wsSrcText,
-                 const CFX_WideString& wsPattern,
-                 CFX_WideString* wsValue);
-  bool ParseNum(const CFX_WideString& wsSrcNum,
-                const CFX_WideString& wsPattern,
-                CFX_WideString* wsValue);
-  bool ParseDateTime(const CFX_WideString& wsSrcDateTime,
-                     const CFX_WideString& wsPattern,
+  bool ParseText(const WideString& wsSrcText,
+                 const WideString& wsPattern,
+                 WideString* wsValue);
+  bool ParseNum(const WideString& wsSrcNum,
+                const WideString& wsPattern,
+                WideString* wsValue);
+  bool ParseDateTime(const WideString& wsSrcDateTime,
+                     const WideString& wsPattern,
                      FX_DATETIMETYPE eDateTimeType,
                      CFX_DateTime* dtValue);
-  bool ParseZero(const CFX_WideString& wsSrcText,
-                 const CFX_WideString& wsPattern);
-  bool ParseNull(const CFX_WideString& wsSrcText,
-                 const CFX_WideString& wsPattern);
+  bool ParseZero(const WideString& wsSrcText, const WideString& wsPattern);
+  bool ParseNull(const WideString& wsSrcText, const WideString& wsPattern);
 
-  bool FormatText(const CFX_WideString& wsSrcText,
-                  const CFX_WideString& wsPattern,
-                  CFX_WideString* wsOutput);
-  bool FormatNum(const CFX_WideString& wsSrcNum,
-                 const CFX_WideString& wsPattern,
-                 CFX_WideString* wsOutput);
-  bool FormatDateTime(const CFX_WideString& wsSrcDateTime,
-                      const CFX_WideString& wsPattern,
+  bool FormatText(const WideString& wsSrcText,
+                  const WideString& wsPattern,
+                  WideString* wsOutput);
+  bool FormatNum(const WideString& wsSrcNum,
+                 const WideString& wsPattern,
+                 WideString* wsOutput);
+  bool FormatDateTime(const WideString& wsSrcDateTime,
+                      const WideString& wsPattern,
                       FX_DATETIMETYPE eDateTimeType,
-                      CFX_WideString* wsOutput);
-  bool FormatZero(const CFX_WideString& wsPattern, CFX_WideString* wsOutput);
-  bool FormatNull(const CFX_WideString& wsPattern, CFX_WideString* wsOutput);
+                      WideString* wsOutput);
+  bool FormatZero(const WideString& wsPattern, WideString* wsOutput);
+  bool FormatNull(const WideString& wsPattern, WideString* wsOutput);
 
  private:
-  CFX_WideString GetTextFormat(const CFX_WideString& wsPattern,
-                               const CFX_WideStringC& wsCategory);
-  IFX_Locale* GetNumericFormat(const CFX_WideString& wsPattern,
+  WideString GetTextFormat(const WideString& wsPattern,
+                           const WideStringView& wsCategory);
+  IFX_Locale* GetNumericFormat(const WideString& wsPattern,
                                int32_t* iDotIndex,
                                uint32_t* dwStyle,
-                               CFX_WideString* wsPurgePattern);
-  bool FormatStrNum(const CFX_WideStringC& wsInputNum,
-                    const CFX_WideString& wsPattern,
-                    CFX_WideString* wsOutput);
-  FX_DATETIMETYPE GetDateTimeFormat(const CFX_WideString& wsPattern,
+                               WideString* wsPurgePattern);
+  bool FormatStrNum(const WideStringView& wsInputNum,
+                    const WideString& wsPattern,
+                    WideString* wsOutput);
+  FX_DATETIMETYPE GetDateTimeFormat(const WideString& wsPattern,
                                     IFX_Locale** pLocale,
-                                    CFX_WideString* wsDatePattern,
-                                    CFX_WideString* wsTimePattern);
+                                    WideString* wsDatePattern,
+                                    WideString* wsTimePattern);
 
   CXFA_LocaleMgr* m_pLocaleMgr;
 };
diff --git a/xfa/fgas/crt/cfgas_formatstring_unittest.cpp b/xfa/fgas/crt/cfgas_formatstring_unittest.cpp
index 3adcedf7b2..b3d42f655e 100644
--- a/xfa/fgas/crt/cfgas_formatstring_unittest.cpp
+++ b/xfa/fgas/crt/cfgas_formatstring_unittest.cpp
@@ -43,7 +43,7 @@ class CFGAS_FormatStringTest : public testing::Test {
 
   // Note, this re-creates the fmt on each call. If you need to multiple
   // times store it locally.
-  CFGAS_FormatString* fmt(const CFX_WideString& locale) {
+  CFGAS_FormatString* fmt(const WideString& locale) {
     mgr_ = pdfium::MakeUnique<CXFA_LocaleMgr>(nullptr, locale);
     fmt_ = pdfium::MakeUnique<CFGAS_FormatString>(mgr_.get());
     return fmt_.get();
@@ -112,7 +112,7 @@ TEST_F(CFGAS_FormatStringTest, DateFormat) {
   // of DDD, DDDD, MMM, MMMM, E, e, gg, YYY, YYYYY.
 
   for (size_t i = 0; i < FX_ArraySize(tests); ++i) {
-    CFX_WideString result;
+    WideString result;
     EXPECT_TRUE(fmt(tests[i].locale)
                     ->FormatDateTime(tests[i].input, tests[i].pattern,
                                      FX_DATETIMETYPE_Date, &result));
@@ -161,7 +161,7 @@ TEST_F(CFGAS_FormatStringTest, TimeFormat) {
   SetTZ("UTC+2");
 
   for (size_t i = 0; i < FX_ArraySize(tests); ++i) {
-    CFX_WideString result;
+    WideString result;
     EXPECT_TRUE(fmt(tests[i].locale)
                     ->FormatDateTime(tests[i].input, tests[i].pattern,
                                      FX_DATETIMETYPE_Time, &result));
@@ -191,7 +191,7 @@ TEST_F(CFGAS_FormatStringTest, DateTimeFormat) {
        L"At 10:30 GMT on Jul 16, 1999"}};
 
   for (size_t i = 0; i < FX_ArraySize(tests); ++i) {
-    CFX_WideString result;
+    WideString result;
     EXPECT_TRUE(fmt(tests[i].locale)
                     ->FormatDateTime(tests[i].input, tests[i].pattern,
                                      FX_DATETIMETYPE_TimeDate, &result));
@@ -288,7 +288,7 @@ TEST_F(CFGAS_FormatStringTest, DateParse) {
 // }
 
 TEST_F(CFGAS_FormatStringTest, SplitFormatString) {
-  std::vector<CFX_WideString> results;
+  std::vector<WideString> results;
   fmt(L"en")->SplitFormatString(
       L"null{'No data'} | null{} | text{999*9999} | text{999*999*9999}",
       &results);
@@ -416,7 +416,7 @@ TEST_F(CFGAS_FormatStringTest, NumParse) {
   };
 
   for (size_t i = 0; i < FX_ArraySize(tests); ++i) {
-    CFX_WideString result;
+    WideString result;
     EXPECT_TRUE(fmt(tests[i].locale)
                     ->ParseNum(tests[i].input, tests[i].pattern, &result))
         << " TEST: " << i;
@@ -512,7 +512,7 @@ TEST_F(CFGAS_FormatStringTest, NumFormat) {
   };
 
   for (size_t i = 0; i < FX_ArraySize(tests); ++i) {
-    CFX_WideString result;
+    WideString result;
     EXPECT_TRUE(fmt(tests[i].locale)
                     ->FormatNum(tests[i].input, tests[i].pattern, &result))
         << " TEST: " << i;
@@ -538,7 +538,7 @@ TEST_F(CFGAS_FormatStringTest, TextParse) {
                {L"en", L"A1C-1234-D text", L"000-9999-X 'text'", L"A1C1234D"}};
 
   for (size_t i = 0; i < FX_ArraySize(tests); ++i) {
-    CFX_WideString result;
+    WideString result;
     EXPECT_TRUE(fmt(tests[i].locale)
                     ->ParseText(tests[i].input, tests[i].pattern, &result));
     EXPECT_STREQ(tests[i].output, result.c_str()) << " TEST: " << i;
@@ -547,7 +547,7 @@ TEST_F(CFGAS_FormatStringTest, TextParse) {
 
 TEST_F(CFGAS_FormatStringTest, InvalidTextParse) {
   // Input does not match mask.
-  CFX_WideString result;
+  WideString result;
   EXPECT_FALSE(fmt(L"en")->ParseText(L"123-4567-8", L"AAA-9999-X", &result));
 }
 
@@ -568,7 +568,7 @@ TEST_F(CFGAS_FormatStringTest, TextFormat) {
   };
 
   for (size_t i = 0; i < FX_ArraySize(tests); ++i) {
-    CFX_WideString result;
+    WideString result;
     EXPECT_TRUE(fmt(tests[i].locale)
                     ->FormatText(tests[i].input, tests[i].pattern, &result));
     EXPECT_STREQ(tests[i].output, result.c_str()) << " TEST: " << i;
@@ -599,7 +599,7 @@ TEST_F(CFGAS_FormatStringTest, NullFormat) {
   } tests[] = {{L"en", L"null{'n/a'}", L"n/a"}, {L"en", L"null{}", L""}};
 
   for (size_t i = 0; i < FX_ArraySize(tests); ++i) {
-    CFX_WideString result;
+    WideString result;
     EXPECT_TRUE(fmt(tests[i].locale)->FormatNull(tests[i].pattern, &result));
     EXPECT_STREQ(tests[i].output, result.c_str()) << " TEST: " << i;
   }
@@ -635,7 +635,7 @@ TEST_F(CFGAS_FormatStringTest, ZeroFormat) {
                {L"en", L"0", L"zero{}", L""}};
 
   for (size_t i = 0; i < FX_ArraySize(tests); ++i) {
-    CFX_WideString result;
+    WideString result;
     EXPECT_TRUE(
         fmt(tests[i].locale)
             ->FormatZero(/* tests[i].input,*/ tests[i].pattern, &result));
diff --git a/xfa/fgas/font/cfgas_fontmgr.cpp b/xfa/fgas/font/cfgas_fontmgr.cpp
index 9cb772ecba..f2405e9844 100644
--- a/xfa/fgas/font/cfgas_fontmgr.cpp
+++ b/xfa/fgas/font/cfgas_fontmgr.cpp
@@ -172,14 +172,14 @@ uint32_t GetFontHashCode(uint16_t wCodePage, uint32_t dwFontStyles) {
 uint32_t GetFontFamilyHash(const wchar_t* pszFontFamily,
                            uint32_t dwFontStyles,
                            uint16_t wCodePage) {
-  CFX_WideString wsFont(pszFontFamily);
+  WideString wsFont(pszFontFamily);
   if (dwFontStyles & FX_FONTSTYLE_Bold)
     wsFont += L"Bold";
   if (dwFontStyles & FX_FONTSTYLE_Italic)
     wsFont += L"Italic";
 
   wsFont += wCodePage;
-  return FX_HashCode_GetW(wsFont.AsStringC(), false);
+  return FX_HashCode_GetW(wsFont.AsStringView(), false);
 }
 
 }  // namespace
@@ -307,8 +307,8 @@ CFX_RetainPtr<CFGAS_GEFont> CFGAS_FontMgr::LoadFont(
 
   void* buffer[3] = {pSrcFont.Get(), (void*)(uintptr_t)dwFontStyles,
                      (void*)(uintptr_t)wCodePage};
-  uint32_t dwHash = FX_HashCode_GetA(
-      CFX_ByteStringC((uint8_t*)buffer, sizeof(buffer)), false);
+  uint32_t dwHash =
+      FX_HashCode_GetA(ByteStringView((uint8_t*)buffer, sizeof(buffer)), false);
   auto it = m_DeriveFonts.find(dwHash);
   if (it != m_DeriveFonts.end() && it->second)
     return it->second;
@@ -627,7 +627,7 @@ CFX_FontSourceEnum_File::CFX_FontSourceEnum_File() {
 
 CFX_FontSourceEnum_File::~CFX_FontSourceEnum_File() {}
 
-CFX_ByteString CFX_FontSourceEnum_File::GetNextFile() {
+ByteString CFX_FontSourceEnum_File::GetNextFile() {
   FX_FileHandle* pCurHandle =
       !m_FolderQueue.empty() ? m_FolderQueue.back().pFileHandle : nullptr;
   if (!pCurHandle) {
@@ -639,10 +639,10 @@ CFX_ByteString CFX_FontSourceEnum_File::GetNextFile() {
     hpp.bsParentPath = m_FolderPaths.back();
     m_FolderQueue.push_back(hpp);
   }
-  CFX_ByteString bsName;
+  ByteString bsName;
   bool bFolder;
-  CFX_ByteString bsFolderSeparator =
-      CFX_ByteString::FromUnicode(CFX_WideString(kFolderSeparator));
+  ByteString bsFolderSeparator =
+      ByteString::FromUnicode(WideString(kFolderSeparator));
   while (true) {
     if (!FX_GetNextFile(pCurHandle, &bsName, &bFolder)) {
       FX_CloseFolder(pCurHandle);
@@ -684,7 +684,7 @@ CFX_RetainPtr<CFX_CRTFileAccess> CFX_FontSourceEnum_File::GetNext() {
   if (m_wsNext.GetLength() == 0)
     return nullptr;
 
-  auto pAccess = pdfium::MakeRetain<CFX_CRTFileAccess>(m_wsNext.AsStringC());
+  auto pAccess = pdfium::MakeRetain<CFX_CRTFileAccess>(m_wsNext.AsStringView());
   m_wsNext = GetNextFile().UTF8Decode();
   return pAccess;
 }
@@ -722,8 +722,8 @@ bool CFGAS_FontMgr::EnumFontsFromFontMapper() {
     if (!pFontStream)
       continue;
 
-    CFX_WideString wsFaceName =
-        CFX_WideString::FromLocal(pFontMapper->GetFaceName(i).c_str());
+    WideString wsFaceName =
+        WideString::FromLocal(pFontMapper->GetFaceName(i).c_str());
     RegisterFaces(pFontStream, &wsFaceName);
   }
   return !m_InstalledFonts.empty();
@@ -759,10 +759,10 @@ CFX_RetainPtr<CFGAS_GEFont> CFGAS_FontMgr::GetFontByCodePage(
     uint16_t wCodePage,
     uint32_t dwFontStyles,
     const wchar_t* pszFontFamily) {
-  CFX_ByteString bsHash;
+  ByteString bsHash;
   bsHash.Format("%d, %d", wCodePage, dwFontStyles);
-  bsHash += FX_UTF8Encode(CFX_WideStringC(pszFontFamily));
-  uint32_t dwHash = FX_HashCode_GetA(bsHash.AsStringC(), false);
+  bsHash += FX_UTF8Encode(WideStringView(pszFontFamily));
+  uint32_t dwHash = FX_HashCode_GetA(bsHash.AsStringView(), false);
   std::vector<CFX_RetainPtr<CFGAS_GEFont>>* pFontArray = &m_Hash2Fonts[dwHash];
   if (!pFontArray->empty())
     return (*pFontArray)[0];
@@ -773,7 +773,7 @@ CFX_RetainPtr<CFGAS_GEFont> CFGAS_FontMgr::GetFontByCodePage(
     auto pNewFonts = pdfium::MakeUnique<std::vector<CFX_FontDescriptorInfo>>();
     sortedFontInfos = pNewFonts.get();
     MatchFonts(sortedFontInfos, wCodePage, dwFontStyles,
-               CFX_WideString(pszFontFamily), 0);
+               WideString(pszFontFamily), 0);
     m_Hash2CandidateList[dwHash] = std::move(pNewFonts);
   }
   if (sortedFontInfos->empty())
@@ -800,13 +800,13 @@ CFX_RetainPtr<CFGAS_GEFont> CFGAS_FontMgr::GetFontByUnicode(
   const FGAS_FONTUSB* x = FGAS_GetUnicodeBitField(wUnicode);
   uint16_t wCodePage = x ? x->wCodePage : 0xFFFF;
   uint16_t wBitField = x ? x->wBitField : 0x03E7;
-  CFX_ByteString bsHash;
+  ByteString bsHash;
   if (wCodePage == 0xFFFF)
     bsHash.Format("%d, %d, %d", wCodePage, wBitField, dwFontStyles);
   else
     bsHash.Format("%d, %d", wCodePage, dwFontStyles);
-  bsHash += FX_UTF8Encode(CFX_WideStringC(pszFontFamily));
-  uint32_t dwHash = FX_HashCode_GetA(bsHash.AsStringC(), false);
+  bsHash += FX_UTF8Encode(WideStringView(pszFontFamily));
+  uint32_t dwHash = FX_HashCode_GetA(bsHash.AsStringView(), false);
   std::vector<CFX_RetainPtr<CFGAS_GEFont>>* pFonts = &m_Hash2Fonts[dwHash];
   for (size_t i = 0; i < pFonts->size(); ++i) {
     if (VerifyUnicode((*pFonts)[i], wUnicode))
@@ -818,7 +818,7 @@ CFX_RetainPtr<CFGAS_GEFont> CFGAS_FontMgr::GetFontByUnicode(
     auto pNewFonts = pdfium::MakeUnique<std::vector<CFX_FontDescriptorInfo>>();
     sortedFontInfos = pNewFonts.get();
     MatchFonts(sortedFontInfos, wCodePage, dwFontStyles,
-               CFX_WideString(pszFontFamily), wUnicode);
+               WideString(pszFontFamily), wUnicode);
     m_Hash2CandidateList[dwHash] = std::move(pNewFonts);
   }
   for (const auto& info : *sortedFontInfos) {
@@ -876,7 +876,7 @@ bool CFGAS_FontMgr::VerifyUnicode(const CFX_RetainPtr<CFGAS_GEFont>& pFont,
 }
 
 CFX_RetainPtr<CFGAS_GEFont> CFGAS_FontMgr::LoadFont(
-    const CFX_WideString& wsFaceName,
+    const WideString& wsFaceName,
     int32_t iFaceIndex,
     int32_t* pFaceCount) {
   CFX_FontMgr* pFontMgr = CFX_GEModule::Get()->GetFontMgr();
@@ -993,7 +993,7 @@ CFX_RetainPtr<IFX_SeekableReadStream> CFGAS_FontMgr::CreateFontStream(
 }
 
 CFX_RetainPtr<IFX_SeekableReadStream> CFGAS_FontMgr::CreateFontStream(
-    const CFX_ByteString& bsFaceName) {
+    const ByteString& bsFaceName) {
   CFX_FontMgr* pFontMgr = CFX_GEModule::Get()->GetFontMgr();
   CFX_FontMapper* pFontMapper = pFontMgr->GetBuiltinMapper();
   if (!pFontMapper)
@@ -1015,7 +1015,7 @@ void CFGAS_FontMgr::MatchFonts(
     std::vector<CFX_FontDescriptorInfo>* pMatchedFonts,
     uint16_t wCodePage,
     uint32_t dwFontStyles,
-    const CFX_WideString& FontName,
+    const WideString& FontName,
     wchar_t wcUnicode) {
   pMatchedFonts->clear();
   for (const auto& pFont : m_InstalledFonts) {
@@ -1033,7 +1033,7 @@ void CFGAS_FontMgr::MatchFonts(
 int32_t CFGAS_FontMgr::CalcPenalty(CFX_FontDescriptor* pInstalled,
                                    uint16_t wCodePage,
                                    uint32_t dwFontStyles,
-                                   const CFX_WideString& FontName,
+                                   const WideString& FontName,
                                    wchar_t wcUnicode) {
   int32_t nPenalty = 30000;
   if (FontName.GetLength() != 0) {
@@ -1122,8 +1122,7 @@ void CFGAS_FontMgr::RemoveFont(const CFX_RetainPtr<CFGAS_GEFont>& pEFont) {
   }
 }
 
-void CFGAS_FontMgr::RegisterFace(FXFT_Face pFace,
-                                 const CFX_WideString* pFaceName) {
+void CFGAS_FontMgr::RegisterFace(FXFT_Face pFace, const WideString* pFaceName) {
   if ((pFace->face_flags & FT_FACE_FLAG_SCALABLE) == 0)
     return;
 
@@ -1147,18 +1146,17 @@ void CFGAS_FontMgr::RegisterFace(FXFT_Face pFace,
       table.clear();
   }
   GetNames(table.empty() ? nullptr : table.data(), pFont->m_wsFamilyNames);
-  pFont->m_wsFamilyNames.push_back(
-      CFX_ByteString(pFace->family_name).UTF8Decode());
+  pFont->m_wsFamilyNames.push_back(ByteString(pFace->family_name).UTF8Decode());
   pFont->m_wsFaceName =
       pFaceName ? *pFaceName
-                : CFX_WideString::FromLocal(FXFT_Get_Postscript_Name(pFace));
+                : WideString::FromLocal(FXFT_Get_Postscript_Name(pFace));
   pFont->m_nFaceIndex = pFace->face_index;
   m_InstalledFonts.push_back(std::move(pFont));
 }
 
 void CFGAS_FontMgr::RegisterFaces(
     const CFX_RetainPtr<IFX_SeekableReadStream>& pFontStream,
-    const CFX_WideString* pFaceName) {
+    const WideString* pFaceName) {
   int32_t index = 0;
   int32_t num_faces = 0;
   do {
@@ -1194,12 +1192,12 @@ uint32_t CFGAS_FontMgr::GetFlags(FXFT_Face pFace) {
 }
 
 void CFGAS_FontMgr::GetNames(const uint8_t* name_table,
-                             std::vector<CFX_WideString>& Names) {
+                             std::vector<WideString>& Names) {
   if (!name_table)
     return;
 
   uint8_t* lpTable = (uint8_t*)name_table;
-  CFX_WideString wsFamily;
+  WideString wsFamily;
   uint8_t* sp = lpTable + 2;
   uint8_t* lpNameRecord = lpTable + 6;
   uint16_t nNameCount = GetUInt16(sp);
@@ -1267,8 +1265,8 @@ void CFGAS_FontMgr::GetUSBCSB(FXFT_Face pFace, uint32_t* USB, uint32_t* CSB) {
   CSB[1] = pOS2->ulCodePageRange2;
 }
 
-int32_t CFGAS_FontMgr::IsPartName(const CFX_WideString& Name1,
-                                  const CFX_WideString& Name2) {
+int32_t CFGAS_FontMgr::IsPartName(const WideString& Name1,
+                                  const WideString& Name2) {
   if (Name1.Contains(Name2.c_str()))
     return 1;
   return 0;
diff --git a/xfa/fgas/font/cfgas_fontmgr.h b/xfa/fgas/font/cfgas_fontmgr.h
index ca3cf1c710..8e970361b4 100644
--- a/xfa/fgas/font/cfgas_fontmgr.h
+++ b/xfa/fgas/font/cfgas_fontmgr.h
@@ -131,8 +131,8 @@ class CFX_FontDescriptor {
   ~CFX_FontDescriptor();
 
   int32_t m_nFaceIndex;
-  CFX_WideString m_wsFaceName;
-  std::vector<CFX_WideString> m_wsFamilyNames;
+  WideString m_wsFaceName;
+  std::vector<WideString> m_wsFamilyNames;
   uint32_t m_dwFontStyles;
   uint32_t m_dwUsb[4];
   uint32_t m_dwCsb[2];
@@ -161,7 +161,7 @@ struct FX_HandleParentPath {
     bsParentPath = x.bsParentPath;
   }
   FX_FileHandle* pFileHandle;
-  CFX_ByteString bsParentPath;
+  ByteString bsParentPath;
 };
 
 class CFX_FontSourceEnum_File {
@@ -173,11 +173,11 @@ class CFX_FontSourceEnum_File {
   CFX_RetainPtr<CFX_CRTFileAccess> GetNext();
 
  private:
-  CFX_ByteString GetNextFile();
+  ByteString GetNextFile();
 
-  CFX_WideString m_wsNext;
+  WideString m_wsNext;
   std::vector<FX_HandleParentPath> m_FolderQueue;
-  std::vector<CFX_ByteString> m_FolderPaths;
+  std::vector<ByteString> m_FolderPaths;
 };
 
 class CFGAS_FontMgr : public CFX_Observable<CFGAS_FontMgr> {
@@ -203,28 +203,28 @@ class CFGAS_FontMgr : public CFX_Observable<CFGAS_FontMgr> {
   bool EnumFonts();
   bool EnumFontsFromFontMapper();
   bool EnumFontsFromFiles();
-  void RegisterFace(FXFT_Face pFace, const CFX_WideString* pFaceName);
+  void RegisterFace(FXFT_Face pFace, const WideString* pFaceName);
   void RegisterFaces(const CFX_RetainPtr<IFX_SeekableReadStream>& pFontStream,
-                     const CFX_WideString* pFaceName);
-  void GetNames(const uint8_t* name_table, std::vector<CFX_WideString>& Names);
+                     const WideString* pFaceName);
+  void GetNames(const uint8_t* name_table, std::vector<WideString>& Names);
   std::vector<uint16_t> GetCharsets(FXFT_Face pFace) const;
   void GetUSBCSB(FXFT_Face pFace, uint32_t* USB, uint32_t* CSB);
   uint32_t GetFlags(FXFT_Face pFace);
   bool VerifyUnicode(CFX_FontDescriptor* pDesc, wchar_t wcUnicode);
   bool VerifyUnicode(const CFX_RetainPtr<CFGAS_GEFont>& pFont,
                      wchar_t wcUnicode);
-  int32_t IsPartName(const CFX_WideString& Name1, const CFX_WideString& Name2);
+  int32_t IsPartName(const WideString& Name1, const WideString& Name2);
   void MatchFonts(std::vector<CFX_FontDescriptorInfo>* MatchedFonts,
                   uint16_t wCodePage,
                   uint32_t dwFontStyles,
-                  const CFX_WideString& FontName,
+                  const WideString& FontName,
                   wchar_t wcUnicode = 0xFFFE);
   int32_t CalcPenalty(CFX_FontDescriptor* pInstalled,
                       uint16_t wCodePage,
                       uint32_t dwFontStyles,
-                      const CFX_WideString& FontName,
+                      const WideString& FontName,
                       wchar_t wcUnicode = 0xFFFE);
-  CFX_RetainPtr<CFGAS_GEFont> LoadFont(const CFX_WideString& wsFaceName,
+  CFX_RetainPtr<CFGAS_GEFont> LoadFont(const WideString& wsFaceName,
                                        int32_t iFaceIndex,
                                        int32_t* pFaceCount);
   FXFT_Face LoadFace(const CFX_RetainPtr<IFX_SeekableReadStream>& pFontStream,
@@ -234,7 +234,7 @@ class CFGAS_FontMgr : public CFX_Observable<CFGAS_FontMgr> {
       IFX_SystemFontInfo* pSystemFontInfo,
       uint32_t index);
   CFX_RetainPtr<IFX_SeekableReadStream> CreateFontStream(
-      const CFX_ByteString& bsFaceName);
+      const ByteString& bsFaceName);
 
   CFX_FontSourceEnum_File* const m_pFontSource;
   std::vector<std::unique_ptr<CFX_FontDescriptor>> m_InstalledFonts;
diff --git a/xfa/fgas/font/cfgas_gefont.cpp b/xfa/fgas/font/cfgas_gefont.cpp
index 151aec7d9e..c710ed96b0 100644
--- a/xfa/fgas/font/cfgas_gefont.cpp
+++ b/xfa/fgas/font/cfgas_gefont.cpp
@@ -102,9 +102,9 @@ bool CFGAS_GEFont::LoadFontInternal(const wchar_t* pszFontFamily,
                                     uint16_t wCodePage) {
   if (m_pFont)
     return false;
-  CFX_ByteString csFontFamily;
+  ByteString csFontFamily;
   if (pszFontFamily)
-    csFontFamily = CFX_ByteString::FromUnicode(pszFontFamily);
+    csFontFamily = ByteString::FromUnicode(pszFontFamily);
   uint32_t dwFlags = 0;
   if (dwFontStyles & FX_FONTSTYLE_FixedPitch)
     dwFlags |= FXFONT_FIXED_PITCH;
@@ -173,13 +173,13 @@ CFX_RetainPtr<CFGAS_GEFont> CFGAS_GEFont::Derive(uint32_t dwFontStyles,
   return pdfium::MakeRetain<CFGAS_GEFont>(pFont, dwFontStyles);
 }
 
-CFX_WideString CFGAS_GEFont::GetFamilyName() const {
+WideString CFGAS_GEFont::GetFamilyName() const {
   if (!m_pFont->GetSubstFont() ||
       m_pFont->GetSubstFont()->m_Family.GetLength() == 0) {
-    return CFX_WideString::FromLocal(m_pFont->GetFamilyName().AsStringC());
+    return WideString::FromLocal(m_pFont->GetFamilyName().AsStringView());
   }
-  return CFX_WideString::FromLocal(
-      m_pFont->GetSubstFont()->m_Family.AsStringC());
+  return WideString::FromLocal(
+      m_pFont->GetSubstFont()->m_Family.AsStringView());
 }
 
 uint32_t CFGAS_GEFont::GetFontStyles() const {
@@ -330,7 +330,7 @@ int32_t CFGAS_GEFont::GetGlyphIndex(wchar_t wUnicode,
   if (!m_pFontMgr || !bRecursive)
     return 0xFFFF;
 
-  CFX_WideString wsFamily = GetFamilyName();
+  WideString wsFamily = GetFamilyName();
   CFX_RetainPtr<CFGAS_GEFont> pFont =
       m_pFontMgr->GetFontByUnicode(wUnicode, GetFontStyles(), wsFamily.c_str());
 #if _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
diff --git a/xfa/fgas/font/cfgas_gefont.h b/xfa/fgas/font/cfgas_gefont.h
index cc9e56a110..13ac48f9cb 100644
--- a/xfa/fgas/font/cfgas_gefont.h
+++ b/xfa/fgas/font/cfgas_gefont.h
@@ -89,7 +89,7 @@ class CFGAS_GEFont : public CFX_Retainable {
                         bool bRecursive,
                         CFX_RetainPtr<CFGAS_GEFont>* ppFont,
                         bool bCharCode = false);
-  CFX_WideString GetFamilyName() const;
+  WideString GetFamilyName() const;
 
 #if _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
   bool m_bUseLogFontStyle;
diff --git a/xfa/fgas/layout/cfx_breakline.cpp b/xfa/fgas/layout/cfx_breakline.cpp
index 9eb0211119..d3fce06d6f 100644
--- a/xfa/fgas/layout/cfx_breakline.cpp
+++ b/xfa/fgas/layout/cfx_breakline.cpp
@@ -35,7 +35,7 @@ const CFX_BreakPiece* CFX_BreakLine::GetPiece(int32_t index) const {
   return &m_LinePieces[index];
 }
 
-void CFX_BreakLine::GetString(CFX_WideString& wsStr) const {
+void CFX_BreakLine::GetString(WideString& wsStr) const {
   int32_t iCount = pdfium::CollectionSize<int32_t>(m_LineChars);
   wchar_t* pBuf = wsStr.GetBuffer(iCount);
   for (int32_t i = 0; i < iCount; i++)
diff --git a/xfa/fgas/layout/cfx_breakline.h b/xfa/fgas/layout/cfx_breakline.h
index 138ee3104e..8826976517 100644
--- a/xfa/fgas/layout/cfx_breakline.h
+++ b/xfa/fgas/layout/cfx_breakline.h
@@ -24,7 +24,7 @@ class CFX_BreakLine {
   int32_t CountPieces() const;
   const CFX_BreakPiece* GetPiece(int32_t index) const;
 
-  void GetString(CFX_WideString& wsStr) const;
+  void GetString(WideString& wsStr) const;
   int32_t GetLineEnd() const;
 
   void Clear();
diff --git a/xfa/fgas/layout/cfx_breakpiece.cpp b/xfa/fgas/layout/cfx_breakpiece.cpp
index 70ac66e8ba..364c117e89 100644
--- a/xfa/fgas/layout/cfx_breakpiece.cpp
+++ b/xfa/fgas/layout/cfx_breakpiece.cpp
@@ -34,8 +34,8 @@ CFX_Char* CFX_BreakPiece::GetChar(int32_t index) const {
   return &(*m_pChars)[m_iStartChar + index];
 }
 
-CFX_WideString CFX_BreakPiece::GetString() const {
-  CFX_WideString ret;
+WideString CFX_BreakPiece::GetString() const {
+  WideString ret;
   ret.Reserve(m_iChars);
   for (int32_t i = m_iStartChar; i < m_iStartChar + m_iChars; i++)
     ret += static_cast<wchar_t>((*m_pChars)[i].char_code());
diff --git a/xfa/fgas/layout/cfx_breakpiece.h b/xfa/fgas/layout/cfx_breakpiece.h
index 668245f3c0..bbf4558eb1 100644
--- a/xfa/fgas/layout/cfx_breakpiece.h
+++ b/xfa/fgas/layout/cfx_breakpiece.h
@@ -25,7 +25,7 @@ class CFX_BreakPiece {
   int32_t GetLength() const { return m_iChars; }
 
   CFX_Char* GetChar(int32_t index) const;
-  CFX_WideString GetString() const;
+  WideString GetString() const;
   std::vector<int32_t> GetWidths() const;
 
   CFX_BreakType m_dwStatus;
diff --git a/xfa/fgas/layout/cfx_rtfbreak.h b/xfa/fgas/layout/cfx_rtfbreak.h
index 699815ab98..f5ad90838f 100644
--- a/xfa/fgas/layout/cfx_rtfbreak.h
+++ b/xfa/fgas/layout/cfx_rtfbreak.h
@@ -31,7 +31,7 @@ struct FX_RTFTEXTOBJ {
   FX_RTFTEXTOBJ();
   ~FX_RTFTEXTOBJ();
 
-  CFX_WideString pStr;
+  WideString pStr;
   std::vector<int32_t> pWidths;
   CFX_RetainPtr<CFGAS_GEFont> pFont;
   const CFX_RectF* pRect;
diff --git a/xfa/fgas/layout/cfx_rtfbreak_unittest.cpp b/xfa/fgas/layout/cfx_rtfbreak_unittest.cpp
index 8997edc083..bda52fc76a 100644
--- a/xfa/fgas/layout/cfx_rtfbreak_unittest.cpp
+++ b/xfa/fgas/layout/cfx_rtfbreak_unittest.cpp
@@ -39,7 +39,7 @@ class CFX_RTFBreakTest : public testing::Test {
 TEST_F(CFX_RTFBreakTest, AddChars) {
   auto b = CreateBreak(FX_LAYOUTSTYLE_ExpandTab);
 
-  CFX_WideString str(L"Input String.");
+  WideString str(L"Input String.");
   for (const auto& c : str)
     EXPECT_EQ(CFX_BreakType::None, b->AppendChar(c));
 
diff --git a/xfa/fgas/layout/cfx_txtbreak.h b/xfa/fgas/layout/cfx_txtbreak.h
index 72614bc2e7..959cd8eb48 100644
--- a/xfa/fgas/layout/cfx_txtbreak.h
+++ b/xfa/fgas/layout/cfx_txtbreak.h
@@ -41,7 +41,7 @@ struct FX_TXTRUN {
 
   CFDE_TextEditEngine* pEdtEngine;
   const FDE_TEXTEDITPIECE* pIdentity;
-  CFX_WideString wsStr;
+  WideString wsStr;
   int32_t* pWidths;
   int32_t iLength;
   CFX_RetainPtr<CFGAS_GEFont> pFont;
diff --git a/xfa/fwl/cfwl_barcode.cpp b/xfa/fwl/cfwl_barcode.cpp
index 166827dcb1..1f2a978171 100644
--- a/xfa/fwl/cfwl_barcode.cpp
+++ b/xfa/fwl/cfwl_barcode.cpp
@@ -67,7 +67,7 @@ void CFWL_Barcode::SetType(BC_TYPE type) {
   m_dwStatus = XFA_BCS_NeedUpdate;
 }
 
-void CFWL_Barcode::SetText(const CFX_WideString& wsText) {
+void CFWL_Barcode::SetText(const WideString& wsText) {
   m_pBarcodeEngine.reset();
   m_dwStatus = XFA_BCS_NeedUpdate;
   CFWL_Edit::SetText(wsText);
@@ -204,7 +204,7 @@ void CFWL_Barcode::GenerateBarcodeImageCache() {
   if (m_dwAttributeMask & FWL_BCDATTRIBUTE_TRUNCATED)
     m_pBarcodeEngine->SetTruncated(m_bTruncated);
 
-  m_dwStatus = m_pBarcodeEngine->Encode(GetText().AsStringC())
+  m_dwStatus = m_pBarcodeEngine->Encode(GetText().AsStringView())
                    ? XFA_BCS_EncodeSuccess
                    : 0;
 }
diff --git a/xfa/fwl/cfwl_barcode.h b/xfa/fwl/cfwl_barcode.h
index 48bdeabdd3..2fc79608b3 100644
--- a/xfa/fwl/cfwl_barcode.h
+++ b/xfa/fwl/cfwl_barcode.h
@@ -49,7 +49,7 @@ class CFWL_Barcode : public CFWL_Edit {
   void OnProcessEvent(CFWL_Event* pEvent) override;
 
   // CFWL_Edit
-  void SetText(const CFX_WideString& wsText) override;
+  void SetText(const WideString& wsText) override;
 
   void SetType(BC_TYPE type);
   bool IsProtectedType() const;
diff --git a/xfa/fwl/cfwl_combobox.cpp b/xfa/fwl/cfwl_combobox.cpp
index cbfbd9a447..143d797fbd 100644
--- a/xfa/fwl/cfwl_combobox.cpp
+++ b/xfa/fwl/cfwl_combobox.cpp
@@ -69,7 +69,7 @@ FWL_Type CFWL_ComboBox::GetClassID() const {
   return FWL_Type::ComboBox;
 }
 
-void CFWL_ComboBox::AddString(const CFX_WideStringC& wsText) {
+void CFWL_ComboBox::AddString(const WideStringView& wsText) {
   m_pListBox->AddString(wsText);
 }
 
@@ -208,7 +208,7 @@ void CFWL_ComboBox::SetThemeProvider(IFWL_ThemeProvider* pThemeProvider) {
     m_pEdit->SetThemeProvider(pThemeProvider);
 }
 
-CFX_WideString CFWL_ComboBox::GetTextByIndex(int32_t iIndex) const {
+WideString CFWL_ComboBox::GetTextByIndex(int32_t iIndex) const {
   CFWL_ListItem* pItem = static_cast<CFWL_ListItem*>(
       m_pListBox->GetItem(m_pListBox.get(), iIndex));
   return pItem ? pItem->GetText() : L"";
@@ -219,7 +219,7 @@ void CFWL_ComboBox::SetCurSel(int32_t iSel) {
   bool bClearSel = iSel < 0 || iSel >= iCount;
   if (IsDropDownStyle() && m_pEdit) {
     if (bClearSel) {
-      m_pEdit->SetText(CFX_WideString());
+      m_pEdit->SetText(WideString());
     } else {
       CFWL_ListItem* hItem = m_pListBox->GetItem(this, iSel);
       m_pEdit->SetText(hItem ? hItem->GetText() : L"");
@@ -245,7 +245,7 @@ void CFWL_ComboBox::RemoveStates(uint32_t dwStates) {
   CFWL_Widget::RemoveStates(dwStates);
 }
 
-void CFWL_ComboBox::SetEditText(const CFX_WideString& wsText) {
+void CFWL_ComboBox::SetEditText(const WideString& wsText) {
   if (!m_pEdit)
     return;
 
@@ -253,7 +253,7 @@ void CFWL_ComboBox::SetEditText(const CFX_WideString& wsText) {
   m_pEdit->Update();
 }
 
-CFX_WideString CFWL_ComboBox::GetEditText() const {
+WideString CFWL_ComboBox::GetEditText() const {
   if (m_pEdit)
     return m_pEdit->GetText();
   if (!m_pListBox)
@@ -348,7 +348,7 @@ void CFWL_ComboBox::ShowDropList(bool bActivate) {
 }
 
 void CFWL_ComboBox::MatchEditText() {
-  CFX_WideString wsText = m_pEdit->GetText();
+  WideString wsText = m_pEdit->GetText();
   int32_t iMatch = m_pListBox->MatchItem(wsText);
   if (iMatch != m_iCurSel) {
     m_pListBox->ChangeSelected(iMatch);
@@ -861,7 +861,7 @@ void CFWL_ComboBox::DoSubCtrlKey(CFWL_MessageKey* pMsg) {
     int32_t iCurSel = m_iCurSel;
     bool bDropDown = IsDropDownStyle();
     if (bDropDown && m_pEdit) {
-      CFX_WideString wsText = m_pEdit->GetText();
+      WideString wsText = m_pEdit->GetText();
       iCurSel = m_pListBox->MatchItem(wsText);
       if (iCurSel >= 0) {
         CFWL_ListItem* hItem = m_pListBox->GetItem(this, iCurSel);
@@ -990,7 +990,7 @@ void CFWL_ComboBox::DisForm_OnKey(CFWL_MessageKey* pMsg) {
     bool bMatchEqual = false;
     int32_t iCurSel = m_iCurSel;
     if (m_pEdit) {
-      CFX_WideString wsText = m_pEdit->GetText();
+      WideString wsText = m_pEdit->GetText();
       iCurSel = pComboList->MatchItem(wsText);
       if (iCurSel >= 0) {
         CFWL_ListItem* item = m_pListBox->GetSelItem(iCurSel);
diff --git a/xfa/fwl/cfwl_combobox.h b/xfa/fwl/cfwl_combobox.h
index 7242b1f450..923e2d8b9a 100644
--- a/xfa/fwl/cfwl_combobox.h
+++ b/xfa/fwl/cfwl_combobox.h
@@ -59,16 +59,16 @@ class CFWL_ComboBox : public CFWL_Widget {
   void OnDrawWidget(CXFA_Graphics* pGraphics,
                     const CFX_Matrix& matrix) override;
 
-  CFX_WideString GetTextByIndex(int32_t iIndex) const;
+  WideString GetTextByIndex(int32_t iIndex) const;
   int32_t GetCurSel() const { return m_iCurSel; }
   void SetCurSel(int32_t iSel);
 
-  void AddString(const CFX_WideStringC& wsText);
+  void AddString(const WideStringView& wsText);
   void RemoveAt(int32_t iIndex);
   void RemoveAll();
 
-  void SetEditText(const CFX_WideString& wsText);
-  CFX_WideString GetEditText() const;
+  void SetEditText(const WideString& wsText);
+  WideString GetEditText() const;
 
   void OpenDropDownList(bool bActivate);
 
@@ -83,11 +83,9 @@ class CFWL_ComboBox : public CFWL_Widget {
     return EditCanCopy();
   }
   bool EditCanSelectAll() const { return m_pEdit->GetTextLength() > 0; }
-  bool EditCopy(CFX_WideString& wsCopy) const { return m_pEdit->Copy(wsCopy); }
-  bool EditCut(CFX_WideString& wsCut) { return m_pEdit->Cut(wsCut); }
-  bool EditPaste(const CFX_WideString& wsPaste) {
-    return m_pEdit->Paste(wsPaste);
-  }
+  bool EditCopy(WideString& wsCopy) const { return m_pEdit->Copy(wsCopy); }
+  bool EditCut(WideString& wsCut) { return m_pEdit->Cut(wsCut); }
+  bool EditPaste(const WideString& wsPaste) { return m_pEdit->Paste(wsPaste); }
   void EditSelectAll() { m_pEdit->SelectAll(); }
   void EditDelete() { m_pEdit->ClearText(); }
   void EditDeSelect() { m_pEdit->ClearSelection(); }
diff --git a/xfa/fwl/cfwl_combolist.cpp b/xfa/fwl/cfwl_combolist.cpp
index f334f027e7..1180acf5c8 100644
--- a/xfa/fwl/cfwl_combolist.cpp
+++ b/xfa/fwl/cfwl_combolist.cpp
@@ -25,14 +25,14 @@ CFWL_ComboList::CFWL_ComboList(
   ASSERT(pOuter);
 }
 
-int32_t CFWL_ComboList::MatchItem(const CFX_WideString& wsMatch) {
+int32_t CFWL_ComboList::MatchItem(const WideString& wsMatch) {
   if (wsMatch.IsEmpty())
     return -1;
 
   int32_t iCount = CountItems(this);
   for (int32_t i = 0; i < iCount; i++) {
     CFWL_ListItem* hItem = GetItem(this, i);
-    CFX_WideString wsText = hItem ? hItem->GetText() : L"";
+    WideString wsText = hItem ? hItem->GetText() : L"";
     auto pos = wsText.Find(wsMatch.c_str());
     if (pos.has_value() && pos.value() == 0)
       return i;
diff --git a/xfa/fwl/cfwl_combolist.h b/xfa/fwl/cfwl_combolist.h
index b7ba6b5780..a4d513559e 100644
--- a/xfa/fwl/cfwl_combolist.h
+++ b/xfa/fwl/cfwl_combolist.h
@@ -22,7 +22,7 @@ class CFWL_ComboList : public CFWL_ListBox {
   // CFWL_ListBox.
   void OnProcessMessage(CFWL_Message* pMessage) override;
 
-  int32_t MatchItem(const CFX_WideString& wsMatch);
+  int32_t MatchItem(const WideString& wsMatch);
 
   void ChangeSelected(int32_t iSel);
 
diff --git a/xfa/fwl/cfwl_datetimepicker.cpp b/xfa/fwl/cfwl_datetimepicker.cpp
index c8d7c5dc19..cd58dc7f92 100644
--- a/xfa/fwl/cfwl_datetimepicker.cpp
+++ b/xfa/fwl/cfwl_datetimepicker.cpp
@@ -160,7 +160,7 @@ void CFWL_DateTimePicker::SetCurSel(int32_t iYear,
   m_pMonthCal->SetSelect(iYear, iMonth, iDay);
 }
 
-void CFWL_DateTimePicker::SetEditText(const CFX_WideString& wsText) {
+void CFWL_DateTimePicker::SetEditText(const WideString& wsText) {
   if (!m_pEdit)
     return;
 
@@ -171,7 +171,7 @@ void CFWL_DateTimePicker::SetEditText(const CFX_WideString& wsText) {
   DispatchEvent(&ev);
 }
 
-CFX_WideString CFWL_DateTimePicker::GetEditText() const {
+WideString CFWL_DateTimePicker::GetEditText() const {
   return m_pEdit ? m_pEdit->GetText() : L"";
 }
 
@@ -211,7 +211,7 @@ void CFWL_DateTimePicker::DrawDropDownButton(CXFA_Graphics* pGraphics,
 void CFWL_DateTimePicker::FormatDateString(int32_t iYear,
                                            int32_t iMonth,
                                            int32_t iDay,
-                                           CFX_WideString& wsText) {
+                                           WideString& wsText) {
   if ((m_pProperties->m_dwStyleExes & FWL_STYLEEXT_DTP_ShortDateFormat) ==
       FWL_STYLEEXT_DTP_ShortDateFormat) {
     wsText.Format(L"%d-%d-%d", iYear, iMonth, iDay);
@@ -307,7 +307,7 @@ void CFWL_DateTimePicker::ProcessSelChanged(int32_t iYear,
   m_iMonth = iMonth;
   m_iDay = iDay;
 
-  CFX_WideString wsText;
+  WideString wsText;
   FormatDateString(m_iYear, m_iMonth, m_iDay, wsText);
   m_pEdit->SetText(wsText);
   m_pEdit->Update();
diff --git a/xfa/fwl/cfwl_datetimepicker.h b/xfa/fwl/cfwl_datetimepicker.h
index ece489e276..276fea451d 100644
--- a/xfa/fwl/cfwl_datetimepicker.h
+++ b/xfa/fwl/cfwl_datetimepicker.h
@@ -49,8 +49,8 @@ class CFWL_DateTimePicker : public CFWL_Widget {
   void GetCurSel(int32_t& iYear, int32_t& iMonth, int32_t& iDay);
   void SetCurSel(int32_t iYear, int32_t iMonth, int32_t iDay);
 
-  void SetEditText(const CFX_WideString& wsText);
-  CFX_WideString GetEditText() const;
+  void SetEditText(const WideString& wsText);
+  WideString GetEditText() const;
 
   bool HasSelection() const { return m_pEdit->HasSelection(); }
   // Returns <start, end> indices of the selection.
@@ -75,7 +75,7 @@ class CFWL_DateTimePicker : public CFWL_Widget {
   void FormatDateString(int32_t iYear,
                         int32_t iMonth,
                         int32_t iDay,
-                        CFX_WideString& wsText);
+                        WideString& wsText);
   void ResetEditAlignment();
   void InitProxyForm();
   void OnFocusChanged(CFWL_Message* pMsg, bool bSet);
diff --git a/xfa/fwl/cfwl_edit.cpp b/xfa/fwl/cfwl_edit.cpp
index ffe324cefd..1bec1503fc 100644
--- a/xfa/fwl/cfwl_edit.cpp
+++ b/xfa/fwl/cfwl_edit.cpp
@@ -189,12 +189,12 @@ void CFWL_Edit::DrawSpellCheck(CXFA_Graphics* pGraphics,
     pGraphics->ConcatMatrix(pMatrix);
 
   CFWL_EventCheckWord checkWordEvent(this);
-  CFX_ByteString sLatinWord;
+  ByteString sLatinWord;
   CXFA_Path pathSpell;
   int32_t nStart = 0;
   float fOffSetX = m_rtEngine.left - m_fScrollOffsetX;
   float fOffSetY = m_rtEngine.top - m_fScrollOffsetY + m_fVAlignOffset;
-  CFX_WideString wsSpell = GetText();
+  WideString wsSpell = GetText();
   int32_t nContentLen = wsSpell.GetLength();
   for (int i = 0; i < nContentLen; i++) {
     if (FxEditIsLatinWord(wsSpell[i])) {
@@ -270,7 +270,7 @@ void CFWL_Edit::SetThemeProvider(IFWL_ThemeProvider* pThemeProvider) {
   m_pProperties->m_pThemeProvider = pThemeProvider;
 }
 
-void CFWL_Edit::SetText(const CFX_WideString& wsText) {
+void CFWL_Edit::SetText(const WideString& wsText) {
   m_EdtEngine.Clear();
   m_EdtEngine.Insert(0, wsText);
 }
@@ -279,7 +279,7 @@ int32_t CFWL_Edit::GetTextLength() const {
   return m_EdtEngine.GetLength();
 }
 
-CFX_WideString CFWL_Edit::GetText() const {
+WideString CFWL_Edit::GetText() const {
   return m_EdtEngine.GetText();
 }
 
@@ -322,7 +322,7 @@ void CFWL_Edit::SetAliasChar(wchar_t wAlias) {
   m_EdtEngine.SetAliasChar(wAlias);
 }
 
-bool CFWL_Edit::Copy(CFX_WideString& wsCopy) {
+bool CFWL_Edit::Copy(WideString& wsCopy) {
   if (!m_EdtEngine.HasSelection())
     return false;
 
@@ -330,7 +330,7 @@ bool CFWL_Edit::Copy(CFX_WideString& wsCopy) {
   return true;
 }
 
-bool CFWL_Edit::Cut(CFX_WideString& wsCut) {
+bool CFWL_Edit::Cut(WideString& wsCut) {
   if (!m_EdtEngine.HasSelection())
     return false;
 
@@ -338,7 +338,7 @@ bool CFWL_Edit::Cut(CFX_WideString& wsCut) {
   return true;
 }
 
-bool CFWL_Edit::Paste(const CFX_WideString& wsPaste) {
+bool CFWL_Edit::Paste(const WideString& wsPaste) {
   if (m_EdtEngine.HasSelection())
     m_EdtEngine.ReplaceSelectedText(wsPaste);
   else
@@ -396,7 +396,7 @@ void CFWL_Edit::OnCaretChanged() {
   }
 }
 
-void CFWL_Edit::OnTextChanged(const CFX_WideString& prevText) {
+void CFWL_Edit::OnTextChanged(const WideString& prevText) {
   if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_VAlignMask)
     UpdateVAlignment();
 
@@ -412,7 +412,7 @@ void CFWL_Edit::OnSelChanged() {
   RepaintRect(GetClientRect());
 }
 
-bool CFWL_Edit::OnValidate(const CFX_WideString& wsText) {
+bool CFWL_Edit::OnValidate(const WideString& wsText) {
   CFWL_Widget* pDst = GetOuter();
   if (!pDst)
     pDst = this;
@@ -1050,7 +1050,7 @@ bool CFWL_Edit::ValidateNumberChar(wchar_t cNum) {
   if (!m_bSetRange)
     return true;
 
-  CFX_WideString wsText = m_EdtEngine.GetText();
+  WideString wsText = m_EdtEngine.GetText();
   if (wsText.IsEmpty())
     return cNum != L'0';
 
@@ -1060,9 +1060,9 @@ bool CFWL_Edit::ValidateNumberChar(wchar_t cNum) {
     return false;
 
   int32_t nLen = wsText.GetLength();
-  CFX_WideString l = wsText.Left(m_CursorPosition);
-  CFX_WideString r = wsText.Right(nLen - m_CursorPosition);
-  CFX_WideString wsNew = l + cNum + r;
+  WideString l = wsText.Left(m_CursorPosition);
+  WideString r = wsText.Right(nLen - m_CursorPosition);
+  WideString wsNew = l + cNum + r;
   return wsNew.GetInteger() <= m_iMax;
 }
 
@@ -1369,7 +1369,7 @@ void CFWL_Edit::OnChar(CFWL_MessageKey* pMsg) {
       if (pMsg->m_dwFlags & kEditingModifier)
         break;
 
-      m_EdtEngine.Insert(m_CursorPosition, CFX_WideString(c));
+      m_EdtEngine.Insert(m_CursorPosition, WideString(c));
       SetCursorPosition(m_CursorPosition + 1);
       break;
     }
diff --git a/xfa/fwl/cfwl_edit.h b/xfa/fwl/cfwl_edit.h
index 310cb81578..e85baaaa38 100644
--- a/xfa/fwl/cfwl_edit.h
+++ b/xfa/fwl/cfwl_edit.h
@@ -65,10 +65,10 @@ class CFWL_Edit : public CFWL_Widget, public CFDE_TextEditEngine::Delegate {
   void OnDrawWidget(CXFA_Graphics* pGraphics,
                     const CFX_Matrix& matrix) override;
 
-  virtual void SetText(const CFX_WideString& wsText);
+  virtual void SetText(const WideString& wsText);
 
   int32_t GetTextLength() const;
-  CFX_WideString GetText() const;
+  WideString GetText() const;
   void ClearText();
 
   void SelectAll();
@@ -80,9 +80,9 @@ class CFWL_Edit : public CFWL_Widget, public CFDE_TextEditEngine::Delegate {
   int32_t GetLimit() const;
   void SetLimit(int32_t nLimit);
   void SetAliasChar(wchar_t wAlias);
-  bool Copy(CFX_WideString& wsCopy);
-  bool Cut(CFX_WideString& wsCut);
-  bool Paste(const CFX_WideString& wsPaste);
+  bool Copy(WideString& wsCopy);
+  bool Cut(WideString& wsCut);
+  bool Paste(const WideString& wsPaste);
   bool Undo();
   bool Redo();
   bool CanUndo();
@@ -93,9 +93,9 @@ class CFWL_Edit : public CFWL_Widget, public CFDE_TextEditEngine::Delegate {
   // CFDE_TextEditEngine::Delegate
   void NotifyTextFull() override;
   void OnCaretChanged() override;
-  void OnTextChanged(const CFX_WideString& prevText) override;
+  void OnTextChanged(const WideString& prevText) override;
   void OnSelChanged() override;
-  bool OnValidate(const CFX_WideString& wsText) override;
+  bool OnValidate(const WideString& wsText) override;
   void SetScrollOffset(float fScrollOffset) override;
 
  protected:
@@ -171,8 +171,8 @@ class CFWL_Edit : public CFWL_Widget, public CFDE_TextEditEngine::Delegate {
   std::unique_ptr<CFWL_ScrollBar> m_pVertScrollBar;
   std::unique_ptr<CFWL_ScrollBar> m_pHorzScrollBar;
   std::unique_ptr<CFWL_Caret> m_pCaret;
-  CFX_WideString m_wsCache;
-  CFX_WideString m_wsFont;
+  WideString m_wsCache;
+  WideString m_wsFont;
 };
 
 #endif  // XFA_FWL_CFWL_EDIT_H_
diff --git a/xfa/fwl/cfwl_eventcheckword.h b/xfa/fwl/cfwl_eventcheckword.h
index 3de1e75c24..fafe3d3278 100644
--- a/xfa/fwl/cfwl_eventcheckword.h
+++ b/xfa/fwl/cfwl_eventcheckword.h
@@ -14,7 +14,7 @@ class CFWL_EventCheckWord : public CFWL_Event {
   explicit CFWL_EventCheckWord(CFWL_Widget* pSrcTarget);
   ~CFWL_EventCheckWord() override;
 
-  CFX_ByteString bsWord;
+  ByteString bsWord;
   bool bCheckWord;
 };
 
diff --git a/xfa/fwl/cfwl_eventtextchanged.h b/xfa/fwl/cfwl_eventtextchanged.h
index 8ae27627b5..4494f08075 100644
--- a/xfa/fwl/cfwl_eventtextchanged.h
+++ b/xfa/fwl/cfwl_eventtextchanged.h
@@ -14,7 +14,7 @@ class CFWL_EventTextChanged : public CFWL_Event {
   explicit CFWL_EventTextChanged(CFWL_Widget* pSrcTarget);
   ~CFWL_EventTextChanged() override;
 
-  CFX_WideString wsPrevText;
+  WideString wsPrevText;
 };
 
 #endif  // XFA_FWL_CFWL_EVENTTEXTCHANGED_H_
diff --git a/xfa/fwl/cfwl_eventvalidate.h b/xfa/fwl/cfwl_eventvalidate.h
index 512161212a..b8feff1120 100644
--- a/xfa/fwl/cfwl_eventvalidate.h
+++ b/xfa/fwl/cfwl_eventvalidate.h
@@ -14,7 +14,7 @@ class CFWL_EventValidate : public CFWL_Event {
   explicit CFWL_EventValidate(CFWL_Widget* pSrcTarget);
   ~CFWL_EventValidate() override;
 
-  CFX_WideString wsInsert;
+  WideString wsInsert;
   bool bValidate;
 };
 
diff --git a/xfa/fwl/cfwl_form.cpp b/xfa/fwl/cfwl_form.cpp
index 5e59f274b4..4761693d3e 100644
--- a/xfa/fwl/cfwl_form.cpp
+++ b/xfa/fwl/cfwl_form.cpp
@@ -45,8 +45,8 @@ FWL_Type CFWL_Form::GetClassID() const {
   return FWL_Type::Form;
 }
 
-bool CFWL_Form::IsInstance(const CFX_WideStringC& wsClass) const {
-  if (wsClass == CFX_WideStringC(FWL_CLASS_Form))
+bool CFWL_Form::IsInstance(const WideStringView& wsClass) const {
+  if (wsClass == WideStringView(FWL_CLASS_Form))
     return true;
   return CFWL_Widget::IsInstance(wsClass);
 }
diff --git a/xfa/fwl/cfwl_form.h b/xfa/fwl/cfwl_form.h
index 78fee4b915..014ed22798 100644
--- a/xfa/fwl/cfwl_form.h
+++ b/xfa/fwl/cfwl_form.h
@@ -34,7 +34,7 @@ class CFWL_Form : public CFWL_Widget {
 
   // CFWL_Widget
   FWL_Type GetClassID() const override;
-  bool IsInstance(const CFX_WideStringC& wsClass) const override;
+  bool IsInstance(const WideStringView& wsClass) const override;
   CFX_RectF GetClientRect() override;
   void Update() override;
   FWL_WidgetHit HitTest(const CFX_PointF& point) override;
diff --git a/xfa/fwl/cfwl_formproxy.cpp b/xfa/fwl/cfwl_formproxy.cpp
index 123cf2509a..d03c1488cd 100644
--- a/xfa/fwl/cfwl_formproxy.cpp
+++ b/xfa/fwl/cfwl_formproxy.cpp
@@ -24,8 +24,8 @@ FWL_Type CFWL_FormProxy::GetClassID() const {
   return FWL_Type::FormProxy;
 }
 
-bool CFWL_FormProxy::IsInstance(const CFX_WideStringC& wsClass) const {
-  if (wsClass == CFX_WideStringC(FWL_CLASS_FormProxy))
+bool CFWL_FormProxy::IsInstance(const WideStringView& wsClass) const {
+  if (wsClass == WideStringView(FWL_CLASS_FormProxy))
     return true;
   return CFWL_Form::IsInstance(wsClass);
 }
diff --git a/xfa/fwl/cfwl_formproxy.h b/xfa/fwl/cfwl_formproxy.h
index 630719505d..498ff42a3e 100644
--- a/xfa/fwl/cfwl_formproxy.h
+++ b/xfa/fwl/cfwl_formproxy.h
@@ -22,7 +22,7 @@ class CFWL_FormProxy : public CFWL_Form {
 
   // CFWL_Widget
   FWL_Type GetClassID() const override;
-  bool IsInstance(const CFX_WideStringC& wsClass) const override;
+  bool IsInstance(const WideStringView& wsClass) const override;
   void Update() override;
   void DrawWidget(CXFA_Graphics* pGraphics, const CFX_Matrix& matrix) override;
   void OnProcessMessage(CFWL_Message* pMessage) override;
diff --git a/xfa/fwl/cfwl_listbox.cpp b/xfa/fwl/cfwl_listbox.cpp
index 210ec1f06e..0ddb65bc1a 100644
--- a/xfa/fwl/cfwl_listbox.cpp
+++ b/xfa/fwl/cfwl_listbox.cpp
@@ -444,7 +444,7 @@ void CFWL_ListBox::DrawItem(CXFA_Graphics* pGraphics,
   if (!pItem)
     return;
 
-  CFX_WideString wsText = pItem->GetText();
+  WideString wsText = pItem->GetText();
   if (wsText.GetLength() <= 0)
     return;
 
@@ -907,9 +907,9 @@ int32_t CFWL_ListBox::GetItemIndex(CFWL_Widget* pWidget, CFWL_ListItem* pItem) {
   return it != m_ItemArray.end() ? it - m_ItemArray.begin() : -1;
 }
 
-CFWL_ListItem* CFWL_ListBox::AddString(const CFX_WideStringC& wsAdd) {
+CFWL_ListItem* CFWL_ListBox::AddString(const WideStringView& wsAdd) {
   m_ItemArray.emplace_back(
-      pdfium::MakeUnique<CFWL_ListItem>(CFX_WideString(wsAdd)));
+      pdfium::MakeUnique<CFWL_ListItem>(WideString(wsAdd)));
   return m_ItemArray.back().get();
 }
 
diff --git a/xfa/fwl/cfwl_listbox.h b/xfa/fwl/cfwl_listbox.h
index 4704a8a840..4a7818c38d 100644
--- a/xfa/fwl/cfwl_listbox.h
+++ b/xfa/fwl/cfwl_listbox.h
@@ -53,7 +53,7 @@ class CFWL_ListBox : public CFWL_Widget {
   CFWL_ListItem* GetItem(const CFWL_Widget* pWidget, int32_t nIndex) const;
   int32_t GetItemIndex(CFWL_Widget* pWidget, CFWL_ListItem* pItem);
 
-  CFWL_ListItem* AddString(const CFX_WideStringC& wsAdd);
+  CFWL_ListItem* AddString(const WideStringView& wsAdd);
   void RemoveAt(int32_t iIndex);
   void DeleteString(CFWL_ListItem* pItem);
   void DeleteAll();
diff --git a/xfa/fwl/cfwl_listitem.cpp b/xfa/fwl/cfwl_listitem.cpp
index a8ea8a6452..f8a7b753aa 100644
--- a/xfa/fwl/cfwl_listitem.cpp
+++ b/xfa/fwl/cfwl_listitem.cpp
@@ -6,7 +6,7 @@
 
 #include "xfa/fwl/cfwl_listitem.h"
 
-CFWL_ListItem::CFWL_ListItem(const CFX_WideString& text)
+CFWL_ListItem::CFWL_ListItem(const WideString& text)
     : m_dwStates(0), m_wsText(text) {
   m_rtItem.Reset();
 }
diff --git a/xfa/fwl/cfwl_listitem.h b/xfa/fwl/cfwl_listitem.h
index aac67fcb51..62c3a98bd7 100644
--- a/xfa/fwl/cfwl_listitem.h
+++ b/xfa/fwl/cfwl_listitem.h
@@ -12,7 +12,7 @@
 
 class CFWL_ListItem {
  public:
-  explicit CFWL_ListItem(const CFX_WideString& text);
+  explicit CFWL_ListItem(const WideString& text);
   ~CFWL_ListItem();
 
   CFX_RectF GetRect() const { return m_rtItem; }
@@ -21,12 +21,12 @@ class CFWL_ListItem {
   uint32_t GetStates() const { return m_dwStates; }
   void SetStates(uint32_t dwStates) { m_dwStates = dwStates; }
 
-  CFX_WideString GetText() const { return m_wsText; }
+  WideString GetText() const { return m_wsText; }
 
  private:
   CFX_RectF m_rtItem;
   uint32_t m_dwStates;
-  CFX_WideString m_wsText;
+  WideString m_wsText;
 };
 
 #endif  // XFA_FWL_CFWL_LISTITEM_H_
diff --git a/xfa/fwl/cfwl_monthcalendar.cpp b/xfa/fwl/cfwl_monthcalendar.cpp
index 11712fefa4..82cef65c3c 100644
--- a/xfa/fwl/cfwl_monthcalendar.cpp
+++ b/xfa/fwl/cfwl_monthcalendar.cpp
@@ -32,9 +32,9 @@
 
 namespace {
 
-CFX_WideString GetCapacityForDay(IFWL_ThemeProvider* pTheme,
-                                 CFWL_ThemePart& params,
-                                 uint32_t day) {
+WideString GetCapacityForDay(IFWL_ThemeProvider* pTheme,
+                             CFWL_ThemePart& params,
+                             uint32_t day) {
   ASSERT(day < 7);
 
   if (day == 0)
@@ -52,9 +52,9 @@ CFX_WideString GetCapacityForDay(IFWL_ThemeProvider* pTheme,
   return L"Sat";
 }
 
-CFX_WideString GetCapacityForMonth(IFWL_ThemeProvider* pTheme,
-                                   CFWL_ThemePart& params,
-                                   uint32_t month) {
+WideString GetCapacityForMonth(IFWL_ThemeProvider* pTheme,
+                               CFWL_ThemePart& params,
+                               uint32_t month) {
   ASSERT(month < 12);
 
   if (month == 0)
@@ -430,7 +430,7 @@ CFX_SizeF CFWL_MonthCalendar::CalcSize() {
   float fDayMaxW = 0.0f;
   float fDayMaxH = 0.0f;
   for (int day = 10; day <= 31; day++) {
-    CFX_WideString wsDay;
+    WideString wsDay;
     wsDay.Format(L"%d", day);
     CFX_SizeF sz = CalcTextSize(wsDay, m_pProperties->m_pThemeProvider, false);
     fDayMaxW = (fDayMaxW >= sz.width) ? fDayMaxW : sz.width;
@@ -462,7 +462,7 @@ CFX_SizeF CFWL_MonthCalendar::CalcSize() {
       m_szHead.width + MONTHCAL_HEADER_BTN_HMARGIN * 2 + m_szCell.width * 2;
   fs.width = std::max(fs.width, fMonthMaxW);
 
-  CFX_WideString wsToday = GetTodayText(m_iYear, m_iMonth, m_iDay);
+  WideString wsToday = GetTodayText(m_iYear, m_iMonth, m_iDay);
   m_wsToday = L"Today" + wsToday;
   m_szToday = CalcTextSize(wsToday, m_pProperties->m_pThemeProvider, false);
   m_szToday.height = (m_szToday.height >= m_szCell.height) ? m_szToday.height
@@ -579,7 +579,7 @@ void CFWL_MonthCalendar::ResetDateItem() {
     if (iDayOfWeek >= 7)
       iDayOfWeek = 0;
 
-    CFX_WideString wsDay;
+    WideString wsDay;
     wsDay.Format(L"%d", i + 1);
     uint32_t dwStates = 0;
     if (m_iYear == m_iCurYear && m_iMonth == m_iCurMonth && m_iDay == (i + 1))
@@ -674,21 +674,21 @@ void CFWL_MonthCalendar::JumpToToday() {
     AddSelDay(m_iDay);
 }
 
-CFX_WideString CFWL_MonthCalendar::GetHeadText(int32_t iYear, int32_t iMonth) {
+WideString CFWL_MonthCalendar::GetHeadText(int32_t iYear, int32_t iMonth) {
   ASSERT(iMonth > 0 && iMonth < 13);
   static const wchar_t* const pMonth[] = {L"January", L"February", L"March",
                                           L"April",   L"May",      L"June",
                                           L"July",    L"August",   L"September",
                                           L"October", L"November", L"December"};
-  CFX_WideString wsHead;
+  WideString wsHead;
   wsHead.Format(L"%s, %d", pMonth[iMonth - 1], iYear);
   return wsHead;
 }
 
-CFX_WideString CFWL_MonthCalendar::GetTodayText(int32_t iYear,
-                                                int32_t iMonth,
-                                                int32_t iDay) {
-  CFX_WideString wsToday;
+WideString CFWL_MonthCalendar::GetTodayText(int32_t iYear,
+                                            int32_t iMonth,
+                                            int32_t iDay) {
+  WideString wsToday;
   wsToday.Format(L", %d/%d/%d", iDay, iMonth, iYear);
   return wsToday;
 }
@@ -893,7 +893,7 @@ CFWL_MonthCalendar::DATEINFO::DATEINFO(int32_t day,
                                        int32_t dayofweek,
                                        uint32_t dwSt,
                                        CFX_RectF rc,
-                                       CFX_WideString& wsday)
+                                       WideString& wsday)
     : iDay(day),
       iDayOfWeek(dayofweek),
       dwStates(dwSt),
diff --git a/xfa/fwl/cfwl_monthcalendar.h b/xfa/fwl/cfwl_monthcalendar.h
index 6e0d4711f1..50e6843507 100644
--- a/xfa/fwl/cfwl_monthcalendar.h
+++ b/xfa/fwl/cfwl_monthcalendar.h
@@ -80,14 +80,14 @@ class CFWL_MonthCalendar : public CFWL_Widget {
              int32_t dayofweek,
              uint32_t dwSt,
              CFX_RectF rc,
-             CFX_WideString& wsday);
+             WideString& wsday);
     ~DATEINFO();
 
     int32_t iDay;
     int32_t iDayOfWeek;
     uint32_t dwStates;
     CFX_RectF rect;
-    CFX_WideString wsDay;
+    WideString wsDay;
   };
 
   void DrawBackground(CXFA_Graphics* pGraphics,
@@ -141,8 +141,8 @@ class CFWL_MonthCalendar : public CFWL_Widget {
   void RemoveSelDay();
   void AddSelDay(int32_t iDay);
   void JumpToToday();
-  CFX_WideString GetHeadText(int32_t iYear, int32_t iMonth);
-  CFX_WideString GetTodayText(int32_t iYear, int32_t iMonth, int32_t iDay);
+  WideString GetHeadText(int32_t iYear, int32_t iMonth);
+  WideString GetTodayText(int32_t iYear, int32_t iMonth, int32_t iDay);
   int32_t GetDayAtPoint(const CFX_PointF& point) const;
   CFX_RectF GetDayRect(int32_t iDay);
   void OnLButtonDown(CFWL_MessageMouse* pMsg);
@@ -163,8 +163,8 @@ class CFWL_MonthCalendar : public CFWL_Widget {
   CFX_RectF m_rtTodayFlag;
   CFX_RectF m_rtWeekNum;
   CFX_RectF m_rtWeekNumSep;
-  CFX_WideString m_wsHead;
-  CFX_WideString m_wsToday;
+  WideString m_wsHead;
+  WideString m_wsToday;
   std::vector<std::unique_ptr<DATEINFO>> m_arrDates;
   int32_t m_iCurYear;
   int32_t m_iCurMonth;
diff --git a/xfa/fwl/cfwl_themetext.h b/xfa/fwl/cfwl_themetext.h
index 2a42615d6f..91a3f385df 100644
--- a/xfa/fwl/cfwl_themetext.h
+++ b/xfa/fwl/cfwl_themetext.h
@@ -15,7 +15,7 @@ class CFWL_ThemeText : public CFWL_ThemePart {
  public:
   CFWL_ThemeText() : m_pGraphics(nullptr) {}
 
-  CFX_WideString m_wsText;
+  WideString m_wsText;
   FDE_TextStyle m_dwTTOStyles;
   FDE_TextAlignment m_iTTOAlign;
   CXFA_Graphics* m_pGraphics;
diff --git a/xfa/fwl/cfwl_widget.cpp b/xfa/fwl/cfwl_widget.cpp
index 9071f0fb0e..b9b04cf1f4 100644
--- a/xfa/fwl/cfwl_widget.cpp
+++ b/xfa/fwl/cfwl_widget.cpp
@@ -63,7 +63,7 @@ CFWL_Widget::~CFWL_Widget() {
   m_pWidgetMgr->RemoveWidget(this);
 }
 
-bool CFWL_Widget::IsInstance(const CFX_WideStringC& wsClass) const {
+bool CFWL_Widget::IsInstance(const WideStringView& wsClass) const {
   return false;
 }
 
@@ -315,7 +315,7 @@ CFWL_Widget* CFWL_Widget::GetRootOuter() {
   return pRet;
 }
 
-CFX_SizeF CFWL_Widget::CalcTextSize(const CFX_WideString& wsText,
+CFX_SizeF CFWL_Widget::CalcTextSize(const WideString& wsText,
                                     IFWL_ThemeProvider* pTheme,
                                     bool bMultiLine) {
   if (!pTheme)
@@ -336,7 +336,7 @@ CFX_SizeF CFWL_Widget::CalcTextSize(const CFX_WideString& wsText,
   return CFX_SizeF(rect.width, rect.height);
 }
 
-void CFWL_Widget::CalcTextRect(const CFX_WideString& wsText,
+void CFWL_Widget::CalcTextRect(const WideString& wsText,
                                IFWL_ThemeProvider* pTheme,
                                const FDE_TextStyle& dwTTOStyles,
                                FDE_TextAlignment iTTOAlign,
diff --git a/xfa/fwl/cfwl_widget.h b/xfa/fwl/cfwl_widget.h
index 1c5f84d62e..16a818e708 100644
--- a/xfa/fwl/cfwl_widget.h
+++ b/xfa/fwl/cfwl_widget.h
@@ -53,7 +53,7 @@ class CFWL_Widget : public IFWL_WidgetDelegate {
   ~CFWL_Widget() override;
 
   virtual FWL_Type GetClassID() const = 0;
-  virtual bool IsInstance(const CFX_WideStringC& wsClass) const;
+  virtual bool IsInstance(const WideStringView& wsClass) const;
   virtual CFX_RectF GetAutosizedWidgetRect();
   virtual CFX_RectF GetWidgetRect();
   virtual CFX_RectF GetClientRect();
@@ -127,10 +127,10 @@ class CFWL_Widget : public IFWL_WidgetDelegate {
   float GetBorderSize(bool bCX);
   CFX_RectF GetRelativeRect();
   IFWL_ThemeProvider* GetAvailableTheme();
-  CFX_SizeF CalcTextSize(const CFX_WideString& wsText,
+  CFX_SizeF CalcTextSize(const WideString& wsText,
                          IFWL_ThemeProvider* pTheme,
                          bool bMultiLine);
-  void CalcTextRect(const CFX_WideString& wsText,
+  void CalcTextRect(const WideString& wsText,
                     IFWL_ThemeProvider* pTheme,
                     const FDE_TextStyle& dwTTOStyles,
                     FDE_TextAlignment iTTOAlign,
diff --git a/xfa/fwl/cfx_barcode.cpp b/xfa/fwl/cfx_barcode.cpp
index 8b51f2d741..9d667c67b9 100644
--- a/xfa/fwl/cfx_barcode.cpp
+++ b/xfa/fwl/cfx_barcode.cpp
@@ -294,7 +294,7 @@ bool CFX_Barcode::SetTruncated(bool truncated) {
                                : false;
 }
 
-bool CFX_Barcode::Encode(const CFX_WideStringC& contents) {
+bool CFX_Barcode::Encode(const WideStringView& contents) {
   return m_pBCEngine && m_pBCEngine->Encode(contents);
 }
 
diff --git a/xfa/fwl/cfx_barcode.h b/xfa/fwl/cfx_barcode.h
index 32a6db57cc..eec4648e82 100644
--- a/xfa/fwl/cfx_barcode.h
+++ b/xfa/fwl/cfx_barcode.h
@@ -27,7 +27,7 @@ class CFX_Barcode {
 
   bool Create(BC_TYPE type);
   BC_TYPE GetType();
-  bool Encode(const CFX_WideStringC& contents);
+  bool Encode(const WideStringView& contents);
 
   bool RenderDevice(CFX_RenderDevice* device, const CFX_Matrix* matrix);
 
diff --git a/xfa/fwl/theme/cfwl_monthcalendartp.h b/xfa/fwl/theme/cfwl_monthcalendartp.h
index 57438a0551..6a1b9be360 100644
--- a/xfa/fwl/theme/cfwl_monthcalendartp.h
+++ b/xfa/fwl/theme/cfwl_monthcalendartp.h
@@ -45,7 +45,7 @@ class CFWL_MonthCalendarTP : public CFWL_WidgetTP {
   FWLTHEME_STATE GetState(uint32_t dwFWLStates);
 
   std::unique_ptr<MCThemeData> m_pThemeData;
-  CFX_WideString wsResource;
+  WideString wsResource;
 
  private:
   void SetThemeData();
diff --git a/xfa/fwl/theme/cfwl_widgettp.cpp b/xfa/fwl/theme/cfwl_widgettp.cpp
index 4d6503f845..1eade9c70b 100644
--- a/xfa/fwl/theme/cfwl_widgettp.cpp
+++ b/xfa/fwl/theme/cfwl_widgettp.cpp
@@ -53,7 +53,7 @@ void CFWL_WidgetTP::DrawText(CFWL_ThemeText* pParams) {
   pMatrix->Concat(*pGraphics->GetMatrix());
   m_pTextOut->SetMatrix(*pMatrix);
   m_pTextOut->DrawLogicText(pGraphics->GetRenderDevice(),
-                            CFX_WideStringC(pParams->m_wsText.c_str(), iLen),
+                            WideStringView(pParams->m_wsText.c_str(), iLen),
                             pParams->m_rtPart);
 }
 
@@ -260,14 +260,14 @@ CFWL_FontData::CFWL_FontData() : m_dwStyles(0), m_dwCodePage(0) {}
 
 CFWL_FontData::~CFWL_FontData() {}
 
-bool CFWL_FontData::Equal(const CFX_WideStringC& wsFontFamily,
+bool CFWL_FontData::Equal(const WideStringView& wsFontFamily,
                           uint32_t dwFontStyles,
                           uint16_t wCodePage) {
   return m_wsFamily == wsFontFamily && m_dwStyles == dwFontStyles &&
          m_dwCodePage == wCodePage;
 }
 
-bool CFWL_FontData::LoadFont(const CFX_WideStringC& wsFontFamily,
+bool CFWL_FontData::LoadFont(const WideStringView& wsFontFamily,
                              uint32_t dwFontStyles,
                              uint16_t dwCodePage) {
   m_wsFamily = wsFontFamily;
@@ -304,7 +304,7 @@ CFWL_FontManager::CFWL_FontManager() {}
 CFWL_FontManager::~CFWL_FontManager() {}
 
 CFX_RetainPtr<CFGAS_GEFont> CFWL_FontManager::FindFont(
-    const CFX_WideStringC& wsFontFamily,
+    const WideStringView& wsFontFamily,
     uint32_t dwFontStyles,
     uint16_t wCodePage) {
   for (const auto& pData : m_FontsArray) {
diff --git a/xfa/fwl/theme/cfwl_widgettp.h b/xfa/fwl/theme/cfwl_widgettp.h
index 229b9ea7c3..dd36778704 100644
--- a/xfa/fwl/theme/cfwl_widgettp.h
+++ b/xfa/fwl/theme/cfwl_widgettp.h
@@ -106,16 +106,16 @@ class CFWL_FontData {
   CFWL_FontData();
   virtual ~CFWL_FontData();
 
-  bool Equal(const CFX_WideStringC& wsFontFamily,
+  bool Equal(const WideStringView& wsFontFamily,
              uint32_t dwFontStyles,
              uint16_t wCodePage);
-  bool LoadFont(const CFX_WideStringC& wsFontFamily,
+  bool LoadFont(const WideStringView& wsFontFamily,
                 uint32_t dwFontStyles,
                 uint16_t wCodePage);
   CFX_RetainPtr<CFGAS_GEFont> GetFont() const { return m_pFont; }
 
  protected:
-  CFX_WideString m_wsFamily;
+  WideString m_wsFamily;
   uint32_t m_dwStyles;
   uint32_t m_dwCodePage;
 #if _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
@@ -130,7 +130,7 @@ class CFWL_FontManager {
   static CFWL_FontManager* GetInstance();
   static void DestroyInstance();
 
-  CFX_RetainPtr<CFGAS_GEFont> FindFont(const CFX_WideStringC& wsFontFamily,
+  CFX_RetainPtr<CFGAS_GEFont> FindFont(const WideStringView& wsFontFamily,
                                        uint32_t dwFontStyles,
                                        uint16_t dwCodePage);
 
diff --git a/xfa/fxfa/cxfa_deffontmgr.cpp b/xfa/fxfa/cxfa_deffontmgr.cpp
index db730677b5..7dd5de90b1 100644
--- a/xfa/fxfa/cxfa_deffontmgr.cpp
+++ b/xfa/fxfa/cxfa_deffontmgr.cpp
@@ -16,16 +16,16 @@ CXFA_DefFontMgr::~CXFA_DefFontMgr() {}
 
 CFX_RetainPtr<CFGAS_GEFont> CXFA_DefFontMgr::GetFont(
     CXFA_FFDoc* hDoc,
-    const CFX_WideStringC& wsFontFamily,
+    const WideStringView& wsFontFamily,
     uint32_t dwFontStyles,
     uint16_t wCodePage) {
-  CFX_WideString wsFontName(wsFontFamily);
+  WideString wsFontName(wsFontFamily);
   CFGAS_FontMgr* pFDEFontMgr = hDoc->GetApp()->GetFDEFontMgr();
   CFX_RetainPtr<CFGAS_GEFont> pFont =
       pFDEFontMgr->LoadFont(wsFontName.c_str(), dwFontStyles, wCodePage);
   if (!pFont) {
     const XFA_FONTINFO* pCurFont =
-        XFA_GetFontINFOByFontName(wsFontName.AsStringC());
+        XFA_GetFontINFOByFontName(wsFontName.AsStringView());
     if (pCurFont && pCurFont->pReplaceFont) {
       uint32_t dwStyle = 0;
       if (dwFontStyles & FX_FONTSTYLE_Bold) {
@@ -42,8 +42,7 @@ CFX_RetainPtr<CFGAS_GEFont> CXFA_DefFontMgr::GetFont(
           pNameText++;
           iLength--;
         }
-        CFX_WideString wsReplace =
-            CFX_WideString(pReplace, pNameText - pReplace);
+        WideString wsReplace = WideString(pReplace, pNameText - pReplace);
         pFont = pFDEFontMgr->LoadFont(wsReplace.c_str(), dwStyle, wCodePage);
         if (pFont)
           break;
@@ -61,7 +60,7 @@ CFX_RetainPtr<CFGAS_GEFont> CXFA_DefFontMgr::GetFont(
 
 CFX_RetainPtr<CFGAS_GEFont> CXFA_DefFontMgr::GetDefaultFont(
     CXFA_FFDoc* hDoc,
-    const CFX_WideStringC& wsFontFamily,
+    const WideStringView& wsFontFamily,
     uint32_t dwFontStyles,
     uint16_t wCodePage) {
   CFGAS_FontMgr* pFDEFontMgr = hDoc->GetApp()->GetFDEFontMgr();
diff --git a/xfa/fxfa/cxfa_deffontmgr.h b/xfa/fxfa/cxfa_deffontmgr.h
index 5f50ffb08d..3a5ea75460 100644
--- a/xfa/fxfa/cxfa_deffontmgr.h
+++ b/xfa/fxfa/cxfa_deffontmgr.h
@@ -21,14 +21,13 @@ class CXFA_DefFontMgr {
   ~CXFA_DefFontMgr();
 
   CFX_RetainPtr<CFGAS_GEFont> GetFont(CXFA_FFDoc* hDoc,
-                                      const CFX_WideStringC& wsFontFamily,
+                                      const WideStringView& wsFontFamily,
                                       uint32_t dwFontStyles,
                                       uint16_t wCodePage = 0xFFFF);
-  CFX_RetainPtr<CFGAS_GEFont> GetDefaultFont(
-      CXFA_FFDoc* hDoc,
-      const CFX_WideStringC& wsFontFamily,
-      uint32_t dwFontStyles,
-      uint16_t wCodePage = 0xFFFF);
+  CFX_RetainPtr<CFGAS_GEFont> GetDefaultFont(CXFA_FFDoc* hDoc,
+                                             const WideStringView& wsFontFamily,
+                                             uint32_t dwFontStyles,
+                                             uint16_t wCodePage = 0xFFFF);
 
  private:
   std::vector<CFX_RetainPtr<CFGAS_GEFont>> m_CacheFonts;
diff --git a/xfa/fxfa/cxfa_eventparam.h b/xfa/fxfa/cxfa_eventparam.h
index 1e7c12a34a..eafd76c6af 100644
--- a/xfa/fxfa/cxfa_eventparam.h
+++ b/xfa/fxfa/cxfa_eventparam.h
@@ -55,7 +55,7 @@ class CXFA_EventParam {
 
   CXFA_WidgetAcc* m_pTarget;
   XFA_EVENTTYPE m_eType;
-  CFX_WideString m_wsResult;
+  WideString m_wsResult;
   bool m_bCancelAction;
   int32_t m_iCommitKey;
   bool m_bKeyDown;
@@ -64,14 +64,14 @@ class CXFA_EventParam {
   int32_t m_iSelEnd;
   int32_t m_iSelStart;
   bool m_bShift;
-  CFX_WideString m_wsChange;
-  CFX_WideString m_wsFullText;
-  CFX_WideString m_wsNewContentType;
-  CFX_WideString m_wsNewText;
-  CFX_WideString m_wsPrevContentType;
-  CFX_WideString m_wsPrevText;
-  CFX_WideString m_wsSoapFaultCode;
-  CFX_WideString m_wsSoapFaultString;
+  WideString m_wsChange;
+  WideString m_wsFullText;
+  WideString m_wsNewContentType;
+  WideString m_wsNewText;
+  WideString m_wsPrevContentType;
+  WideString m_wsPrevText;
+  WideString m_wsSoapFaultCode;
+  WideString m_wsSoapFaultString;
   bool m_bIsFormReady;
 };
 
diff --git a/xfa/fxfa/cxfa_ffbarcode.cpp b/xfa/fxfa/cxfa_ffbarcode.cpp
index 03a7c7d915..9686416f89 100644
--- a/xfa/fxfa/cxfa_ffbarcode.cpp
+++ b/xfa/fxfa/cxfa_ffbarcode.cpp
@@ -95,7 +95,7 @@ const BarCodeInfo g_BarCodeData[] = {
 
 // static
 const BarCodeInfo* CXFA_FFBarcode::GetBarcodeTypeByName(
-    const CFX_WideStringC& wsName) {
+    const WideStringView& wsName) {
   if (wsName.IsEmpty())
     return nullptr;
 
@@ -129,7 +129,7 @@ bool CXFA_FFBarcode::LoadWidget() {
   m_pNormalWidget->SetDelegate(this);
   m_pNormalWidget->LockUpdate();
 
-  CFX_WideString wsText;
+  WideString wsText;
   m_pDataAcc->GetValue(wsText, XFA_VALUEPICTURE_Display);
   pFWLBarcode->SetText(wsText);
   UpdateWidgetProperty();
@@ -161,8 +161,8 @@ void CXFA_FFBarcode::UpdateWidgetProperty() {
   CXFA_FFTextEdit::UpdateWidgetProperty();
 
   auto* pBarCodeWidget = static_cast<CFWL_Barcode*>(m_pNormalWidget.get());
-  CFX_WideString wsType = GetDataAcc()->GetBarcodeType();
-  const BarCodeInfo* pBarcodeInfo = GetBarcodeTypeByName(wsType.AsStringC());
+  WideString wsType = GetDataAcc()->GetBarcodeType();
+  const BarCodeInfo* pBarcodeInfo = GetBarcodeTypeByName(wsType.AsStringView());
   if (!pBarcodeInfo)
     return;
 
diff --git a/xfa/fxfa/cxfa_ffbarcode.h b/xfa/fxfa/cxfa_ffbarcode.h
index 13e5032594..f03246d18e 100644
--- a/xfa/fxfa/cxfa_ffbarcode.h
+++ b/xfa/fxfa/cxfa_ffbarcode.h
@@ -85,7 +85,7 @@ struct BarCodeInfo {
 
 class CXFA_FFBarcode : public CXFA_FFTextEdit {
  public:
-  static const BarCodeInfo* GetBarcodeTypeByName(const CFX_WideStringC& wsName);
+  static const BarCodeInfo* GetBarcodeTypeByName(const WideStringView& wsName);
 
   explicit CXFA_FFBarcode(CXFA_WidgetAcc* pDataAcc);
   ~CXFA_FFBarcode() override;
diff --git a/xfa/fxfa/cxfa_ffcombobox.cpp b/xfa/fxfa/cxfa_ffcombobox.cpp
index 950cab5daf..ca5645f8e2 100644
--- a/xfa/fxfa/cxfa_ffcombobox.cpp
+++ b/xfa/fxfa/cxfa_ffcombobox.cpp
@@ -52,13 +52,13 @@ bool CXFA_FFComboBox::LoadWidget() {
   m_pNormalWidget->LockUpdate();
 
   for (const auto& label : m_pDataAcc->GetChoiceListItems(false))
-    pComboBox->AddString(label.AsStringC());
+    pComboBox->AddString(label.AsStringView());
 
   std::vector<int32_t> iSelArray = m_pDataAcc->GetSelectedItems();
   if (!iSelArray.empty()) {
     pComboBox->SetCurSel(iSelArray.front());
   } else {
-    CFX_WideString wsText;
+    WideString wsText;
     m_pDataAcc->GetValue(wsText, XFA_VALUEPICTURE_Raw);
     pComboBox->SetEditText(wsText);
   }
@@ -120,15 +120,15 @@ bool CXFA_FFComboBox::CommitData() {
 
 bool CXFA_FFComboBox::IsDataChanged() {
   auto* pFWLcombobox = ToComboBox(m_pNormalWidget.get());
-  CFX_WideString wsText = pFWLcombobox->GetEditText();
+  WideString wsText = pFWLcombobox->GetEditText();
   int32_t iCursel = pFWLcombobox->GetCurSel();
   if (iCursel >= 0) {
-    CFX_WideString wsSel = pFWLcombobox->GetTextByIndex(iCursel);
+    WideString wsSel = pFWLcombobox->GetTextByIndex(iCursel);
     if (wsSel == wsText)
       m_pDataAcc->GetChoiceListItem(wsText, iCursel, true);
   }
 
-  CFX_WideString wsOldValue;
+  WideString wsOldValue;
   m_pDataAcc->GetValue(wsOldValue, XFA_VALUEPICTURE_Raw);
   if (wsOldValue == wsText)
     return false;
@@ -193,7 +193,7 @@ bool CXFA_FFComboBox::UpdateFWLData() {
   if (!iSelArray.empty()) {
     pComboBox->SetCurSel(iSelArray.front());
   } else {
-    CFX_WideString wsText;
+    WideString wsText;
     pComboBox->SetCurSel(-1);
     m_pDataAcc->GetValue(wsText, XFA_VALUEPICTURE_Raw);
     pComboBox->SetEditText(wsText);
@@ -241,16 +241,16 @@ bool CXFA_FFComboBox::CanSelectAll() {
   return ToComboBox(m_pNormalWidget.get())->EditCanSelectAll();
 }
 
-bool CXFA_FFComboBox::Copy(CFX_WideString& wsCopy) {
+bool CXFA_FFComboBox::Copy(WideString& wsCopy) {
   return ToComboBox(m_pNormalWidget.get())->EditCopy(wsCopy);
 }
 
-bool CXFA_FFComboBox::Cut(CFX_WideString& wsCut) {
+bool CXFA_FFComboBox::Cut(WideString& wsCut) {
   return m_pDataAcc->IsChoiceListAllowTextEntry() &&
          ToComboBox(m_pNormalWidget.get())->EditCut(wsCut);
 }
 
-bool CXFA_FFComboBox::Paste(const CFX_WideString& wsPaste) {
+bool CXFA_FFComboBox::Paste(const WideString& wsPaste) {
   return m_pDataAcc->IsChoiceListAllowTextEntry() &&
          ToComboBox(m_pNormalWidget.get())->EditPaste(wsPaste);
 }
@@ -273,7 +273,7 @@ void CXFA_FFComboBox::SetItemState(int32_t nIndex, bool bSelected) {
   AddInvalidateRect();
 }
 
-void CXFA_FFComboBox::InsertItem(const CFX_WideStringC& wsLabel,
+void CXFA_FFComboBox::InsertItem(const WideStringView& wsLabel,
                                  int32_t nIndex) {
   ToComboBox(m_pNormalWidget.get())->AddString(wsLabel);
   m_pNormalWidget->Update();
@@ -291,7 +291,7 @@ void CXFA_FFComboBox::DeleteItem(int32_t nIndex) {
 }
 
 void CXFA_FFComboBox::OnTextChanged(CFWL_Widget* pWidget,
-                                    const CFX_WideString& wsChanged) {
+                                    const WideString& wsChanged) {
   CXFA_EventParam eParam;
   m_pDataAcc->GetValue(eParam.m_wsPrevText, XFA_VALUEPICTURE_Raw);
   eParam.m_wsChange = wsChanged;
@@ -335,7 +335,7 @@ void CXFA_FFComboBox::OnProcessEvent(CFWL_Event* pEvent) {
       break;
     }
     case CFWL_Event::Type::EditChanged: {
-      CFX_WideString wsChanged;
+      WideString wsChanged;
       OnTextChanged(m_pNormalWidget.get(), wsChanged);
       break;
     }
diff --git a/xfa/fxfa/cxfa_ffcombobox.h b/xfa/fxfa/cxfa_ffcombobox.h
index 33e7d7cc1f..81da2c2125 100644
--- a/xfa/fxfa/cxfa_ffcombobox.h
+++ b/xfa/fxfa/cxfa_ffcombobox.h
@@ -29,9 +29,9 @@ class CXFA_FFComboBox : public CXFA_FFField {
   bool CanCut() override;
   bool CanPaste() override;
   bool CanSelectAll() override;
-  bool Copy(CFX_WideString& wsCopy) override;
-  bool Cut(CFX_WideString& wsCut) override;
-  bool Paste(const CFX_WideString& wsPaste) override;
+  bool Copy(WideString& wsCopy) override;
+  bool Cut(WideString& wsCut) override;
+  bool Paste(const WideString& wsPaste) override;
   void SelectAll() override;
   void Delete() override;
   void DeSelect() override;
@@ -44,12 +44,12 @@ class CXFA_FFComboBox : public CXFA_FFField {
 
   virtual void OpenDropDownList();
 
-  void OnTextChanged(CFWL_Widget* pWidget, const CFX_WideString& wsChanged);
+  void OnTextChanged(CFWL_Widget* pWidget, const WideString& wsChanged);
   void OnSelectChanged(CFWL_Widget* pWidget, bool bLButtonUp);
   void OnPreOpen(CFWL_Widget* pWidget);
   void OnPostOpen(CFWL_Widget* pWidget);
   void SetItemState(int32_t nIndex, bool bSelected);
-  void InsertItem(const CFX_WideStringC& wsLabel, int32_t nIndex);
+  void InsertItem(const WideStringView& wsLabel, int32_t nIndex);
   void DeleteItem(int32_t nIndex);
 
  private:
@@ -62,7 +62,7 @@ class CXFA_FFComboBox : public CXFA_FFField {
   uint32_t GetAlignment();
   void FWLEventSelChange(CXFA_EventParam* pParam);
 
-  CFX_WideString m_wsNewValue;
+  WideString m_wsNewValue;
   IFWL_WidgetDelegate* m_pOldDelegate;
 };
 
diff --git a/xfa/fxfa/cxfa_ffdatetimeedit.cpp b/xfa/fxfa/cxfa_ffdatetimeedit.cpp
index cfef664039..643d384efd 100644
--- a/xfa/fxfa/cxfa_ffdatetimeedit.cpp
+++ b/xfa/fxfa/cxfa_ffdatetimeedit.cpp
@@ -45,7 +45,7 @@ bool CXFA_FFDateTimeEdit::LoadWidget() {
   m_pNormalWidget->SetDelegate(this);
   m_pNormalWidget->LockUpdate();
 
-  CFX_WideString wsText;
+  WideString wsText;
   m_pDataAcc->GetValue(wsText, XFA_VALUEPICTURE_Display);
   pWidget->SetEditText(wsText);
   if (CXFA_Value value = m_pDataAcc->GetFormValue()) {
@@ -148,7 +148,7 @@ bool CXFA_FFDateTimeEdit::UpdateFWLData() {
   if (IsFocused())
     eType = XFA_VALUEPICTURE_Edit;
 
-  CFX_WideString wsText;
+  WideString wsText;
   m_pDataAcc->GetValue(wsText, eType);
 
   auto* normalWidget = static_cast<CFWL_DateTimePicker*>(m_pNormalWidget.get());
@@ -169,9 +169,9 @@ bool CXFA_FFDateTimeEdit::IsDataChanged() {
   if (m_dwStatus & XFA_WidgetStatus_TextEditValueChanged)
     return true;
 
-  CFX_WideString wsText =
+  WideString wsText =
       static_cast<CFWL_DateTimePicker*>(m_pNormalWidget.get())->GetEditText();
-  CFX_WideString wsOldValue;
+  WideString wsOldValue;
   m_pDataAcc->GetValue(wsOldValue, XFA_VALUEPICTURE_Edit);
   return wsOldValue != wsText;
 }
@@ -180,13 +180,13 @@ void CXFA_FFDateTimeEdit::OnSelectChanged(CFWL_Widget* pWidget,
                                           int32_t iYear,
                                           int32_t iMonth,
                                           int32_t iDay) {
-  CFX_WideString wsPicture;
+  WideString wsPicture;
   m_pDataAcc->GetPictureContent(wsPicture, XFA_VALUEPICTURE_Edit);
 
   CXFA_LocaleValue date(XFA_VT_DATE, GetDoc()->GetXFADoc()->GetLocalMgr());
   date.SetDate(CFX_DateTime(iYear, iMonth, iDay, 0, 0, 0, 0));
 
-  CFX_WideString wsDate;
+  WideString wsDate;
   date.FormatPatterns(wsDate, wsPicture, m_pDataAcc->GetLocal(),
                       XFA_VALUEPICTURE_Edit);
 
diff --git a/xfa/fxfa/cxfa_ffdoc.cpp b/xfa/fxfa/cxfa_ffdoc.cpp
index 4d998e16d9..b3ff3c9930 100644
--- a/xfa/fxfa/cxfa_ffdoc.cpp
+++ b/xfa/fxfa/cxfa_ffdoc.cpp
@@ -181,7 +181,7 @@ bool XFA_GetPDFContentsFromPDFXML(CFX_XMLNode* pPDFElement,
        pXMLNode; pXMLNode = pXMLNode->GetNodeItem(CFX_XMLNode::NextSibling)) {
     if (pXMLNode->GetType() == FX_XMLNODE_Element) {
       CFX_XMLElement* pXMLElement = static_cast<CFX_XMLElement*>(pXMLNode);
-      CFX_WideString wsTagName = pXMLElement->GetName();
+      WideString wsTagName = pXMLElement->GetName();
       if (wsTagName == L"document") {
         pDocumentElement = pXMLElement;
         break;
@@ -197,7 +197,7 @@ bool XFA_GetPDFContentsFromPDFXML(CFX_XMLNode* pPDFElement,
        pXMLNode; pXMLNode = pXMLNode->GetNodeItem(CFX_XMLNode::NextSibling)) {
     if (pXMLNode->GetType() == FX_XMLNODE_Element) {
       CFX_XMLElement* pXMLElement = static_cast<CFX_XMLElement*>(pXMLNode);
-      CFX_WideString wsTagName = pXMLElement->GetName();
+      WideString wsTagName = pXMLElement->GetName();
       if (wsTagName == L"chunk") {
         pChunkElement = pXMLElement;
         break;
@@ -207,7 +207,7 @@ bool XFA_GetPDFContentsFromPDFXML(CFX_XMLNode* pPDFElement,
   if (!pChunkElement) {
     return false;
   }
-  CFX_WideString wsPDFContent = pChunkElement->GetTextData();
+  WideString wsPDFContent = pChunkElement->GetTextData();
   iBufferSize =
       Base64DecodeW(wsPDFContent.c_str(), wsPDFContent.GetLength(), nullptr);
   pByteBuffer = FX_Alloc(uint8_t, iBufferSize + 1);
@@ -261,7 +261,7 @@ void CXFA_FFDoc::StopLoad() {
   if (!pDynamicRender)
     return;
 
-  CFX_WideString wsType;
+  WideString wsType;
   if (pDynamicRender->TryContent(wsType) && wsType == L"required")
     m_dwDocType = XFA_DocType::Dynamic;
 }
@@ -333,7 +333,7 @@ void CXFA_FFDoc::CloseDoc() {
 }
 
 CFX_RetainPtr<CFX_DIBitmap> CXFA_FFDoc::GetPDFNamedImage(
-    const CFX_WideStringC& wsName,
+    const WideStringView& wsName,
     int32_t& iImageXDpi,
     int32_t& iImageYDpi) {
   if (!m_pPDFDoc)
@@ -360,10 +360,10 @@ CFX_RetainPtr<CFX_DIBitmap> CXFA_FFDoc::GetPDFNamedImage(
     return nullptr;
 
   CPDF_NameTree nametree(pXFAImages);
-  CPDF_Object* pObject = nametree.LookupValue(CFX_WideString(wsName));
+  CPDF_Object* pObject = nametree.LookupValue(WideString(wsName));
   if (!pObject) {
     for (size_t i = 0; i < nametree.GetCount(); i++) {
-      CFX_WideString wsTemp;
+      WideString wsTemp;
       CPDF_Object* pTempObject = nametree.LookupValueAndName(i, &wsTemp);
       if (wsTemp == wsName) {
         pObject = pTempObject;
@@ -399,7 +399,7 @@ bool CXFA_FFDoc::SavePackage(XFA_HashCode code,
   if (!pNode)
     return !!pExport->Export(pFile);
 
-  CFX_ByteString bsChecksum;
+  ByteString bsChecksum;
   if (pCSContext)
     bsChecksum = pCSContext->GetChecksum();
 
diff --git a/xfa/fxfa/cxfa_ffdoc.h b/xfa/fxfa/cxfa_ffdoc.h
index 984d8b6507..7984d7425b 100644
--- a/xfa/fxfa/cxfa_ffdoc.h
+++ b/xfa/fxfa/cxfa_ffdoc.h
@@ -69,7 +69,7 @@ class CXFA_FFDoc {
   CPDF_Document* GetPDFDoc() const { return m_pPDFDoc.Get(); }
   CXFA_FFDocView* GetDocView(CXFA_LayoutProcessor* pLayout);
   CXFA_FFDocView* GetDocView();
-  CFX_RetainPtr<CFX_DIBitmap> GetPDFNamedImage(const CFX_WideStringC& wsName,
+  CFX_RetainPtr<CFX_DIBitmap> GetPDFNamedImage(const WideStringView& wsName,
                                                int32_t& iImageXDpi,
                                                int32_t& iImageYDpi);
 
diff --git a/xfa/fxfa/cxfa_ffdochandler.cpp b/xfa/fxfa/cxfa_ffdochandler.cpp
index b0a84fa29a..8dbc55050a 100644
--- a/xfa/fxfa/cxfa_ffdochandler.cpp
+++ b/xfa/fxfa/cxfa_ffdochandler.cpp
@@ -44,7 +44,7 @@ XFA_ATTRIBUTEENUM CXFA_FFDocHandler::GetRestoreState(CXFA_FFDoc* hDoc) {
 
 bool CXFA_FFDocHandler::RunDocScript(CXFA_FFDoc* hDoc,
                                      XFA_SCRIPTTYPE eScriptType,
-                                     const CFX_WideStringC& wsScript,
+                                     const WideStringView& wsScript,
                                      CFXJSE_Value* pRetValue,
                                      CFXJSE_Value* pThisValue) {
   CXFA_Document* pXFADoc = hDoc->GetXFADoc();
diff --git a/xfa/fxfa/cxfa_ffdochandler.h b/xfa/fxfa/cxfa_ffdochandler.h
index 45b2ee07e1..7da03b0148 100644
--- a/xfa/fxfa/cxfa_ffdochandler.h
+++ b/xfa/fxfa/cxfa_ffdochandler.h
@@ -21,7 +21,7 @@ class CXFA_FFDocHandler {
 
   bool RunDocScript(CXFA_FFDoc* hDoc,
                     XFA_SCRIPTTYPE eScriptType,
-                    const CFX_WideStringC& wsScript,
+                    const WideStringView& wsScript,
                     CFXJSE_Value* pRetValue,
                     CFXJSE_Value* pThisObject);
 };
diff --git a/xfa/fxfa/cxfa_ffdocview.cpp b/xfa/fxfa/cxfa_ffdocview.cpp
index 95faeb3606..56dfeed3ca 100644
--- a/xfa/fxfa/cxfa_ffdocview.cpp
+++ b/xfa/fxfa/cxfa_ffdocview.cpp
@@ -154,12 +154,12 @@ void CXFA_FFDocView::ShowNullTestMsg() {
   if (pAppProvider && iCount) {
     int32_t iRemain = iCount > 7 ? iCount - 7 : 0;
     iCount -= iRemain;
-    CFX_WideString wsMsg;
+    WideString wsMsg;
     for (int32_t i = 0; i < iCount; i++) {
       wsMsg += m_arrNullTestMsg[i] + L"\n";
     }
     if (iRemain > 0) {
-      CFX_WideString wsTemp;
+      WideString wsTemp;
       wsTemp.Format(
           L"Message limit exceeded. Remaining %d "
           L"validation errors not reported.",
@@ -259,7 +259,7 @@ int32_t CXFA_FFDocView::ProcessWidgetEvent(CXFA_EventParam* pParam,
     return XFA_EVENTERROR_Error;
 
   if (pParam->m_eType == XFA_EVENT_Validate) {
-    CFX_WideString wsValidateStr(L"preSubmit");
+    WideString wsValidateStr(L"preSubmit");
     CXFA_Node* pConfigItem =
         ToNode(m_pDoc->GetXFADoc()->GetXFAObject(XFA_HASHCODE_Config));
     if (pConfigItem) {
@@ -478,7 +478,7 @@ int32_t CXFA_FFDocView::ExecEventActivityByDeepFirst(CXFA_Node* pFormNode,
   return iRet;
 }
 
-CXFA_FFWidget* CXFA_FFDocView::GetWidgetByName(const CFX_WideString& wsName,
+CXFA_FFWidget* CXFA_FFDocView::GetWidgetByName(const WideString& wsName,
                                                CXFA_FFWidget* pRefWidget) {
   CXFA_WidgetAcc* pRefAcc = pRefWidget ? pRefWidget->GetDataAcc() : nullptr;
   CXFA_WidgetAcc* pAcc = GetWidgetAccByName(wsName, pRefAcc);
@@ -486,9 +486,9 @@ CXFA_FFWidget* CXFA_FFDocView::GetWidgetByName(const CFX_WideString& wsName,
 }
 
 CXFA_WidgetAcc* CXFA_FFDocView::GetWidgetAccByName(
-    const CFX_WideString& wsName,
+    const WideString& wsName,
     CXFA_WidgetAcc* pRefWidgetAcc) {
-  CFX_WideString wsExpression;
+  WideString wsExpression;
   uint32_t dwStyle = XFA_RESOLVENODE_Children | XFA_RESOLVENODE_Properties |
                      XFA_RESOLVENODE_Siblings | XFA_RESOLVENODE_Parent;
   CXFA_ScriptContext* pScriptContext = m_pDoc->GetXFADoc()->GetScriptContext();
@@ -504,7 +504,7 @@ CXFA_WidgetAcc* CXFA_FFDocView::GetWidgetAccByName(
   }
   XFA_RESOLVENODE_RS resoveNodeRS;
   int32_t iRet = pScriptContext->ResolveObjects(
-      refNode, wsExpression.AsStringC(), resoveNodeRS, dwStyle);
+      refNode, wsExpression.AsStringView(), resoveNodeRS, dwStyle);
   if (iRet < 1)
     return nullptr;
 
@@ -735,7 +735,7 @@ void CXFA_FFDocView::RunBindItems() {
     CXFA_BindItems binditems(item);
     CXFA_ScriptContext* pScriptContext =
         pWidgetNode->GetDocument()->GetScriptContext();
-    CFX_WideStringC wsRef;
+    WideStringView wsRef;
     binditems.GetRef(wsRef);
     uint32_t dwStyle = XFA_RESOLVENODE_Children | XFA_RESOLVENODE_Properties |
                        XFA_RESOLVENODE_Siblings | XFA_RESOLVENODE_Parent |
@@ -746,14 +746,14 @@ void CXFA_FFDocView::RunBindItems() {
     if (rs.dwFlags != XFA_RESOVENODE_RSTYPE_Nodes || rs.objects.empty())
       continue;
 
-    CFX_WideStringC wsValueRef, wsLabelRef;
+    WideStringView wsValueRef, wsLabelRef;
     binditems.GetValueRef(wsValueRef);
     binditems.GetLabelRef(wsLabelRef);
     const bool bUseValue = wsLabelRef.IsEmpty() || wsLabelRef == wsValueRef;
     const bool bLabelUseContent = wsLabelRef.IsEmpty() || wsLabelRef == L"$";
     const bool bValueUseContent = wsValueRef.IsEmpty() || wsValueRef == L"$";
-    CFX_WideString wsValue;
-    CFX_WideString wsLabel;
+    WideString wsValue;
+    WideString wsLabel;
     uint32_t uValueHash = FX_HashCode_GetW(wsValueRef, false);
     for (CXFA_Object* refObject : rs.objects) {
       CXFA_Node* refNode = refObject->AsNode();
diff --git a/xfa/fxfa/cxfa_ffdocview.h b/xfa/fxfa/cxfa_ffdocview.h
index 314ce29393..981491c60a 100644
--- a/xfa/fxfa/cxfa_ffdocview.h
+++ b/xfa/fxfa/cxfa_ffdocview.h
@@ -60,9 +60,9 @@ class CXFA_FFDocView {
   CXFA_FFWidget* GetFocusWidget() const;
   void KillFocus();
   bool SetFocus(CXFA_FFWidget* hWidget);
-  CXFA_FFWidget* GetWidgetByName(const CFX_WideString& wsName,
+  CXFA_FFWidget* GetWidgetByName(const WideString& wsName,
                                  CXFA_FFWidget* pRefWidget);
-  CXFA_WidgetAcc* GetWidgetAccByName(const CFX_WideString& wsName,
+  CXFA_WidgetAcc* GetWidgetAccByName(const WideString& wsName,
                                      CXFA_WidgetAcc* pRefWidgetAcc);
   CXFA_LayoutProcessor* GetXFALayout() const;
   void OnPageEvent(CXFA_ContainerLayoutItem* pSender, uint32_t dwEvent);
@@ -100,7 +100,7 @@ class CXFA_FFDocView {
                                        bool bRecursive,
                                        CXFA_Node* pExclude);
   bool m_bLayoutEvent;
-  std::vector<CFX_WideString> m_arrNullTestMsg;
+  std::vector<WideString> m_arrNullTestMsg;
   CXFA_FFWidget* m_pListFocusWidget;
   bool m_bInLayoutStatus;
 
diff --git a/xfa/fxfa/cxfa_fffield.cpp b/xfa/fxfa/cxfa_fffield.cpp
index bfc9e4edbc..c35cfe18fe 100644
--- a/xfa/fxfa/cxfa_fffield.cpp
+++ b/xfa/fxfa/cxfa_fffield.cpp
@@ -687,7 +687,7 @@ int32_t CXFA_FFField::CalculateWidgetAcc(CXFA_WidgetAcc* pAcc) {
         if (!script)
           return 1;
 
-        CFX_WideString wsExpression;
+        WideString wsExpression;
         script.GetExpression(wsExpression);
         if (wsExpression.IsEmpty())
           return 1;
@@ -700,7 +700,7 @@ int32_t CXFA_FFField::CalculateWidgetAcc(CXFA_WidgetAcc* pAcc) {
       if (!pAppProvider)
         return 0;
 
-      CFX_WideString wsMessage;
+      WideString wsMessage;
       calc.GetMessageText(wsMessage);
       if (!wsMessage.IsEmpty())
         wsMessage += L"\r\n";
diff --git a/xfa/fxfa/cxfa_fflistbox.cpp b/xfa/fxfa/cxfa_fflistbox.cpp
index 66e1fdb4d0..1fb66706d7 100644
--- a/xfa/fxfa/cxfa_fflistbox.cpp
+++ b/xfa/fxfa/cxfa_fflistbox.cpp
@@ -53,7 +53,7 @@ bool CXFA_FFListBox::LoadWidget() {
   m_pNormalWidget->LockUpdate();
 
   for (const auto& label : m_pDataAcc->GetChoiceListItems(false))
-    pListBox->AddString(label.AsStringC());
+    pListBox->AddString(label.AsStringView());
 
   uint32_t dwExtendedStyle = FWL_STYLEEXT_LTB_ShowScrollBarFocus;
   if (m_pDataAcc->GetChoiceListOpen() == XFA_ATTRIBUTEENUM_MultiSelect)
@@ -169,10 +169,9 @@ void CXFA_FFListBox::SetItemState(int32_t nIndex, bool bSelected) {
   AddInvalidateRect();
 }
 
-void CXFA_FFListBox::InsertItem(const CFX_WideStringC& wsLabel,
-                                int32_t nIndex) {
-  CFX_WideString wsTemp(wsLabel);
-  ToListBox(m_pNormalWidget.get())->AddString(wsTemp.AsStringC());
+void CXFA_FFListBox::InsertItem(const WideStringView& wsLabel, int32_t nIndex) {
+  WideString wsTemp(wsLabel);
+  ToListBox(m_pNormalWidget.get())->AddString(wsTemp.AsStringView());
   m_pNormalWidget->Update();
   AddInvalidateRect();
 }
diff --git a/xfa/fxfa/cxfa_fflistbox.h b/xfa/fxfa/cxfa_fflistbox.h
index bf97d931d8..f31b122bd1 100644
--- a/xfa/fxfa/cxfa_fflistbox.h
+++ b/xfa/fxfa/cxfa_fflistbox.h
@@ -24,7 +24,7 @@ class CXFA_FFListBox : public CXFA_FFField {
 
   void OnSelectChanged(CFWL_Widget* pWidget);
   void SetItemState(int32_t nIndex, bool bSelected);
-  void InsertItem(const CFX_WideStringC& wsLabel, int32_t nIndex);
+  void InsertItem(const WideStringView& wsLabel, int32_t nIndex);
   void DeleteItem(int32_t nIndex);
 
  private:
diff --git a/xfa/fxfa/cxfa_ffnotify.cpp b/xfa/fxfa/cxfa_ffnotify.cpp
index 9c2ac91e80..9aac64ab6d 100644
--- a/xfa/fxfa/cxfa_ffnotify.cpp
+++ b/xfa/fxfa/cxfa_ffnotify.cpp
@@ -287,11 +287,11 @@ void CXFA_FFNotify::OpenDropDownList(CXFA_FFWidget* hWidget) {
   pDocView->UpdateDocView();
 }
 
-CFX_WideString CXFA_FFNotify::GetCurrentDateTime() {
+WideString CXFA_FFNotify::GetCurrentDateTime() {
   CFX_DateTime dataTime;
   dataTime.Now();
 
-  CFX_WideString wsDateTime;
+  WideString wsDateTime;
   wsDateTime.Format(L"%d%02d%02dT%02d%02d%02d", dataTime.GetYear(),
                     dataTime.GetMonth(), dataTime.GetDay(), dataTime.GetHour(),
                     dataTime.GetMinute(), dataTime.GetSecond());
diff --git a/xfa/fxfa/cxfa_ffnotify.h b/xfa/fxfa/cxfa_ffnotify.h
index 12aca5ede3..01adc33c1c 100644
--- a/xfa/fxfa/cxfa_ffnotify.h
+++ b/xfa/fxfa/cxfa_ffnotify.h
@@ -62,7 +62,7 @@ class CXFA_FFNotify {
   CXFA_FFWidgetHandler* GetWidgetHandler();
   CXFA_FFWidget* GetHWidget(CXFA_LayoutItem* pLayoutItem);
   void OpenDropDownList(CXFA_FFWidget* hWidget);
-  CFX_WideString GetCurrentDateTime();
+  WideString GetCurrentDateTime();
   void ResetData(CXFA_WidgetData* pWidgetData = nullptr);
   int32_t GetLayoutStatus();
   void RunNodeInitialize(CXFA_Node* pNode);
diff --git a/xfa/fxfa/cxfa_ffnumericedit.cpp b/xfa/fxfa/cxfa_ffnumericedit.cpp
index 4da98ac7fd..9b87c406d7 100644
--- a/xfa/fxfa/cxfa_ffnumericedit.cpp
+++ b/xfa/fxfa/cxfa_ffnumericedit.cpp
@@ -33,7 +33,7 @@ bool CXFA_FFNumericEdit::LoadWidget() {
   m_pNormalWidget->SetDelegate(this);
   m_pNormalWidget->LockUpdate();
 
-  CFX_WideString wsText;
+  WideString wsText;
   m_pDataAcc->GetValue(wsText, XFA_VALUEPICTURE_Display);
   pWidget->SetText(wsText);
   UpdateWidgetProperty();
@@ -75,9 +75,8 @@ void CXFA_FFNumericEdit::OnProcessEvent(CFWL_Event* pEvent) {
   CXFA_FFTextEdit::OnProcessEvent(pEvent);
 }
 
-bool CXFA_FFNumericEdit::OnValidate(CFWL_Widget* pWidget,
-                                    CFX_WideString& wsText) {
-  CFX_WideString wsPattern;
+bool CXFA_FFNumericEdit::OnValidate(CFWL_Widget* pWidget, WideString& wsText) {
+  WideString wsPattern;
   m_pDataAcc->GetPictureContent(wsPattern, XFA_VALUEPICTURE_Edit);
   if (!wsPattern.IsEmpty())
     return true;
@@ -88,7 +87,7 @@ bool CXFA_FFNumericEdit::OnValidate(CFWL_Widget* pWidget,
   int32_t iFracs = 0;
   m_pDataAcc->GetFracDigits(iFracs);
 
-  CFX_WideString wsFormat;
+  WideString wsFormat;
   CXFA_LocaleValue widgetValue = XFA_GetLocaleValue(m_pDataAcc.Get());
   widgetValue.GetNumericFormat(wsFormat, iLeads, iFracs);
   return widgetValue.ValidateNumericTemp(wsText, wsFormat,
diff --git a/xfa/fxfa/cxfa_ffnumericedit.h b/xfa/fxfa/cxfa_ffnumericedit.h
index ece0a49604..fb06fd4d34 100644
--- a/xfa/fxfa/cxfa_ffnumericedit.h
+++ b/xfa/fxfa/cxfa_ffnumericedit.h
@@ -25,7 +25,7 @@ class CXFA_FFNumericEdit : public CXFA_FFTextEdit {
   void OnProcessEvent(CFWL_Event* pEvent) override;
 
  private:
-  bool OnValidate(CFWL_Widget* pWidget, CFX_WideString& wsText);
+  bool OnValidate(CFWL_Widget* pWidget, WideString& wsText);
 };
 
 #endif  // XFA_FXFA_CXFA_FFNUMERICEDIT_H_
diff --git a/xfa/fxfa/cxfa_ffpageview.cpp b/xfa/fxfa/cxfa_ffpageview.cpp
index 594d71db0d..1de900c2f7 100644
--- a/xfa/fxfa/cxfa_ffpageview.cpp
+++ b/xfa/fxfa/cxfa_ffpageview.cpp
@@ -311,7 +311,7 @@ CXFA_FFWidget* CXFA_FFTabOrderPageWidgetIterator::GetTraverseWidget(
   if (pTraversal) {
     CXFA_Node* pTraverse = pTraversal->GetChild(0, XFA_Element::Traverse);
     if (pTraverse) {
-      CFX_WideString wsTraverseWidgetName;
+      WideString wsTraverseWidgetName;
       if (pTraverse->GetAttribute(XFA_ATTRIBUTE_Ref, wsTraverseWidgetName)) {
         return FindWidgetByName(wsTraverseWidgetName, pWidget);
       }
@@ -320,7 +320,7 @@ CXFA_FFWidget* CXFA_FFTabOrderPageWidgetIterator::GetTraverseWidget(
   return nullptr;
 }
 CXFA_FFWidget* CXFA_FFTabOrderPageWidgetIterator::FindWidgetByName(
-    const CFX_WideString& wsWidgetName,
+    const WideString& wsWidgetName,
     CXFA_FFWidget* pRefWidget) {
   return pRefWidget->GetDocView()->GetWidgetByName(wsWidgetName, pRefWidget);
 }
diff --git a/xfa/fxfa/cxfa_ffpageview.h b/xfa/fxfa/cxfa_ffpageview.h
index f2451fbd26..4e79ad5e3c 100644
--- a/xfa/fxfa/cxfa_ffpageview.h
+++ b/xfa/fxfa/cxfa_ffpageview.h
@@ -92,7 +92,7 @@ class CXFA_FFTabOrderPageWidgetIterator : public IXFA_WidgetIterator {
 
  protected:
   CXFA_FFWidget* GetTraverseWidget(CXFA_FFWidget* pWidget);
-  CXFA_FFWidget* FindWidgetByName(const CFX_WideString& wsWidgetName,
+  CXFA_FFWidget* FindWidgetByName(const WideString& wsWidgetName,
                                   CXFA_FFWidget* pRefWidget);
   void CreateTabOrderWidgetArray();
   void CreateSpaceOrderWidgetArray(std::vector<CXFA_FFWidget*>* WidgetArray);
diff --git a/xfa/fxfa/cxfa_ffpasswordedit.cpp b/xfa/fxfa/cxfa_ffpasswordedit.cpp
index 46105f135b..e050a69e86 100644
--- a/xfa/fxfa/cxfa_ffpasswordedit.cpp
+++ b/xfa/fxfa/cxfa_ffpasswordedit.cpp
@@ -31,7 +31,7 @@ bool CXFA_FFPasswordEdit::LoadWidget() {
   m_pNormalWidget->SetDelegate(this);
   m_pNormalWidget->LockUpdate();
 
-  CFX_WideString wsText;
+  WideString wsText;
   m_pDataAcc->GetValue(wsText, XFA_VALUEPICTURE_Display);
   pWidget->SetText(wsText);
   UpdateWidgetProperty();
@@ -49,7 +49,7 @@ void CXFA_FFPasswordEdit::UpdateWidgetProperty() {
                              FWL_STYLEEXT_EDT_Password;
   dwExtendedStyle |= UpdateUIProperty();
 
-  CFX_WideString wsPassWord;
+  WideString wsPassWord;
   m_pDataAcc->GetPasswordChar(wsPassWord);
   if (!wsPassWord.IsEmpty())
     pWidget->SetAliasChar(wsPassWord[0]);
diff --git a/xfa/fxfa/cxfa_ffpushbutton.cpp b/xfa/fxfa/cxfa_ffpushbutton.cpp
index 63079cfaa0..2fac858a12 100644
--- a/xfa/fxfa/cxfa_ffpushbutton.cpp
+++ b/xfa/fxfa/cxfa_ffpushbutton.cpp
@@ -135,7 +135,7 @@ void CXFA_FFPushButton::LoadHighlightCaption() {
     return;
 
   bool bRichText;
-  CFX_WideString wsRollover;
+  WideString wsRollover;
   if (m_pDataAcc->GetButtonRollover(wsRollover, bRichText)) {
     if (!m_pRollProvider) {
       m_pRollProvider = pdfium::MakeUnique<CXFA_TextProvider>(
@@ -144,7 +144,7 @@ void CXFA_FFPushButton::LoadHighlightCaption() {
     m_pRolloverTextLayout =
         pdfium::MakeUnique<CXFA_TextLayout>(m_pRollProvider.get());
   }
-  CFX_WideString wsDown;
+  WideString wsDown;
   if (m_pDataAcc->GetButtonDown(wsDown, bRichText)) {
     if (!m_pDownProvider) {
       m_pDownProvider = pdfium::MakeUnique<CXFA_TextProvider>(
diff --git a/xfa/fxfa/cxfa_fftextedit.cpp b/xfa/fxfa/cxfa_fftextedit.cpp
index 35c20fab6f..e27971d5df 100644
--- a/xfa/fxfa/cxfa_fftextedit.cpp
+++ b/xfa/fxfa/cxfa_fftextedit.cpp
@@ -47,7 +47,7 @@ bool CXFA_FFTextEdit::LoadWidget() {
   m_pNormalWidget->LockUpdate();
   UpdateWidgetProperty();
 
-  CFX_WideString wsText;
+  WideString wsText;
   m_pDataAcc->GetValue(wsText, XFA_VALUEPICTURE_Display);
   pFWLEdit->SetText(wsText);
   m_pNormalWidget->UnlockUpdate();
@@ -173,8 +173,7 @@ bool CXFA_FFTextEdit::OnKillFocus(CXFA_FFWidget* pNewWidget) {
 }
 
 bool CXFA_FFTextEdit::CommitData() {
-  CFX_WideString wsText =
-      static_cast<CFWL_Edit*>(m_pNormalWidget.get())->GetText();
+  WideString wsText = static_cast<CFWL_Edit*>(m_pNormalWidget.get())->GetText();
   if (m_pDataAcc->SetValue(wsText, XFA_VALUEPICTURE_Edit)) {
     m_pDataAcc->UpdateUIDisplay(this);
     return true;
@@ -183,7 +182,7 @@ bool CXFA_FFTextEdit::CommitData() {
   return false;
 }
 
-void CXFA_FFTextEdit::ValidateNumberField(const CFX_WideString& wsText) {
+void CXFA_FFTextEdit::ValidateNumberField(const WideString& wsText) {
   CXFA_WidgetAcc* pAcc = GetDataAcc();
   if (!pAcc || pAcc->GetUIType() != XFA_Element::NumericEdit)
     return;
@@ -192,10 +191,10 @@ void CXFA_FFTextEdit::ValidateNumberField(const CFX_WideString& wsText) {
   if (!pAppProvider)
     return;
 
-  CFX_WideString wsSomField;
+  WideString wsSomField;
   pAcc->GetNode()->GetSOMExpression(wsSomField);
 
-  CFX_WideString wsMessage;
+  WideString wsMessage;
   wsMessage.Format(L"%s can not contain %s", wsText.c_str(),
                    wsSomField.c_str());
   pAppProvider->MsgBox(wsMessage, pAppProvider->GetAppTitle(), XFA_MBICON_Error,
@@ -272,10 +271,10 @@ bool CXFA_FFTextEdit::UpdateFWLData() {
     bUpdate = true;
   }
 
-  CFX_WideString wsText;
+  WideString wsText;
   m_pDataAcc->GetValue(wsText, eType);
 
-  CFX_WideString wsOldText = pEdit->GetText();
+  WideString wsOldText = pEdit->GetText();
   if (wsText != wsOldText || (eType == XFA_VALUEPICTURE_Edit && bUpdate)) {
     pEdit->SetText(wsText);
     bUpdate = true;
@@ -287,8 +286,8 @@ bool CXFA_FFTextEdit::UpdateFWLData() {
 }
 
 void CXFA_FFTextEdit::OnTextChanged(CFWL_Widget* pWidget,
-                                    const CFX_WideString& wsChanged,
-                                    const CFX_WideString& wsPrevText) {
+                                    const WideString& wsChanged,
+                                    const WideString& wsPrevText) {
   m_dwStatus |= XFA_WidgetStatus_TextEditValueChanged;
   CXFA_EventParam eParam;
   eParam.m_eType = XFA_EVENT_Change;
@@ -318,7 +317,7 @@ void CXFA_FFTextEdit::OnTextFull(CFWL_Widget* pWidget) {
   m_pDataAcc->ProcessEvent(XFA_ATTRIBUTEENUM_Full, &eParam);
 }
 
-bool CXFA_FFTextEdit::CheckWord(const CFX_ByteStringC& sWord) {
+bool CXFA_FFTextEdit::CheckWord(const ByteStringView& sWord) {
   return sWord.IsEmpty() || m_pDataAcc->GetUIType() != XFA_Element::TextEdit;
 }
 
@@ -332,7 +331,7 @@ void CXFA_FFTextEdit::OnProcessEvent(CFWL_Event* pEvent) {
     case CFWL_Event::Type::TextChanged: {
       CFWL_EventTextChanged* event =
           static_cast<CFWL_EventTextChanged*>(pEvent);
-      CFX_WideString wsChange;
+      WideString wsChange;
       OnTextChanged(m_pNormalWidget.get(), wsChange, event->wsPrevText);
       break;
     }
@@ -341,9 +340,9 @@ void CXFA_FFTextEdit::OnProcessEvent(CFWL_Event* pEvent) {
       break;
     }
     case CFWL_Event::Type::CheckWord: {
-      CFX_WideString wstr(L"FWL_EVENT_DTP_SelectChanged");
+      WideString wstr(L"FWL_EVENT_DTP_SelectChanged");
       CFWL_EventCheckWord* event = static_cast<CFWL_EventCheckWord*>(pEvent);
-      event->bCheckWord = CheckWord(event->bsWord.AsStringC());
+      event->bCheckWord = CheckWord(event->bsWord.AsStringView());
       break;
     }
     default:
diff --git a/xfa/fxfa/cxfa_fftextedit.h b/xfa/fxfa/cxfa_fftextedit.h
index 2a3da37350..9735b9e7d8 100644
--- a/xfa/fxfa/cxfa_fftextedit.h
+++ b/xfa/fxfa/cxfa_fftextedit.h
@@ -37,10 +37,10 @@ class CXFA_FFTextEdit : public CXFA_FFField {
                     const CFX_Matrix& matrix) override;
 
   void OnTextChanged(CFWL_Widget* pWidget,
-                     const CFX_WideString& wsChanged,
-                     const CFX_WideString& wsPrevText);
+                     const WideString& wsChanged,
+                     const WideString& wsPrevText);
   void OnTextFull(CFWL_Widget* pWidget);
-  bool CheckWord(const CFX_ByteStringC& sWord);
+  bool CheckWord(const ByteStringView& sWord);
 
  protected:
   uint32_t GetAlignment();
@@ -51,7 +51,7 @@ class CXFA_FFTextEdit : public CXFA_FFField {
   bool CommitData() override;
   bool UpdateFWLData() override;
   bool IsDataChanged() override;
-  void ValidateNumberField(const CFX_WideString& wsText);
+  void ValidateNumberField(const WideString& wsText);
 };
 
 #endif  // XFA_FXFA_CXFA_FFTEXTEDIT_H_
diff --git a/xfa/fxfa/cxfa_ffwidget.cpp b/xfa/fxfa/cxfa_ffwidget.cpp
index 26ab37d53c..07d089b6c4 100644
--- a/xfa/fxfa/cxfa_ffwidget.cpp
+++ b/xfa/fxfa/cxfa_ffwidget.cpp
@@ -966,7 +966,7 @@ CXFA_WidgetAcc* CXFA_FFWidget::GetDataAcc() {
   return m_pDataAcc.Get();
 }
 
-bool CXFA_FFWidget::GetToolTip(CFX_WideString& wsToolTip) {
+bool CXFA_FFWidget::GetToolTip(WideString& wsToolTip) {
   if (CXFA_Assist assist = m_pDataAcc->GetAssist()) {
     if (CXFA_ToolTip toolTip = assist.GetToolTip()) {
       return toolTip.GetTip(wsToolTip);
@@ -1032,7 +1032,7 @@ void CXFA_FFWidget::AddInvalidateRect() {
   m_pDocView->AddInvalidateRect(m_pPageView, rtWidget);
 }
 
-bool CXFA_FFWidget::GetCaptionText(CFX_WideString& wsCap) {
+bool CXFA_FFWidget::GetCaptionText(WideString& wsCap) {
   CXFA_TextLayout* pCapTextlayout = m_pDataAcc->GetCaptionTextLayout();
   if (!pCapTextlayout) {
     return false;
@@ -1168,15 +1168,15 @@ bool CXFA_FFWidget::CanDeSelect() {
   return CanCopy();
 }
 
-bool CXFA_FFWidget::Copy(CFX_WideString& wsCopy) {
+bool CXFA_FFWidget::Copy(WideString& wsCopy) {
   return false;
 }
 
-bool CXFA_FFWidget::Cut(CFX_WideString& wsCut) {
+bool CXFA_FFWidget::Cut(WideString& wsCut) {
   return false;
 }
 
-bool CXFA_FFWidget::Paste(const CFX_WideString& wsPaste) {
+bool CXFA_FFWidget::Paste(const WideString& wsPaste) {
   return false;
 }
 
@@ -1187,12 +1187,12 @@ void CXFA_FFWidget::Delete() {}
 void CXFA_FFWidget::DeSelect() {}
 
 void CXFA_FFWidget::GetSuggestWords(CFX_PointF pointf,
-                                    std::vector<CFX_ByteString>* pWords) {
+                                    std::vector<ByteString>* pWords) {
   pWords->clear();
 }
 
 bool CXFA_FFWidget::ReplaceSpellCheckWord(CFX_PointF pointf,
-                                          const CFX_ByteStringC& bsReplace) {
+                                          const ByteStringView& bsReplace) {
   return false;
 }
 
@@ -1869,8 +1869,8 @@ char* XFA_Base64Encode(const uint8_t* buf, int32_t buf_len) {
   out[j] = '\0';
   return out;
 }
-FXCODEC_IMAGE_TYPE XFA_GetImageType(const CFX_WideString& wsType) {
-  CFX_WideString wsContentType(wsType);
+FXCODEC_IMAGE_TYPE XFA_GetImageType(const WideString& wsType) {
+  WideString wsContentType(wsType);
   wsContentType.MakeLower();
   if (wsContentType == L"image/jpg")
     return FXCODEC_IMAGE_JPG;
@@ -1890,24 +1890,24 @@ CFX_RetainPtr<CFX_DIBitmap> XFA_LoadImageData(CXFA_FFDoc* pDoc,
                                               bool& bNameImage,
                                               int32_t& iImageXDpi,
                                               int32_t& iImageYDpi) {
-  CFX_WideString wsHref;
-  CFX_WideString wsImage;
+  WideString wsHref;
+  WideString wsImage;
   pImage->GetHref(wsHref);
   pImage->GetContent(wsImage);
   if (wsHref.IsEmpty() && wsImage.IsEmpty())
     return nullptr;
 
-  CFX_WideString wsContentType;
+  WideString wsContentType;
   pImage->GetContentType(wsContentType);
   FXCODEC_IMAGE_TYPE type = XFA_GetImageType(wsContentType);
-  CFX_ByteString bsContent;
+  ByteString bsContent;
   uint8_t* pImageBuffer = nullptr;
   CFX_RetainPtr<IFX_SeekableReadStream> pImageFileRead;
   if (wsImage.GetLength() > 0) {
     XFA_ATTRIBUTEENUM iEncoding =
         (XFA_ATTRIBUTEENUM)pImage->GetTransferEncoding();
     if (iEncoding == XFA_ATTRIBUTEENUM_Base64) {
-      CFX_ByteString bsData = wsImage.UTF8Encode();
+      ByteString bsData = wsImage.UTF8Encode();
       int32_t iLength = bsData.GetLength();
       pImageBuffer = FX_Alloc(uint8_t, iLength);
       int32_t iRead = XFA_Base64Decode(bsData.c_str(), pImageBuffer);
@@ -1916,16 +1916,16 @@ CFX_RetainPtr<CFX_DIBitmap> XFA_LoadImageData(CXFA_FFDoc* pDoc,
             pdfium::MakeRetain<CFX_MemoryStream>(pImageBuffer, iRead, false);
       }
     } else {
-      bsContent = CFX_ByteString::FromUnicode(wsImage);
+      bsContent = ByteString::FromUnicode(wsImage);
       pImageFileRead = pdfium::MakeRetain<CFX_MemoryStream>(
           const_cast<uint8_t*>(bsContent.raw_str()), bsContent.GetLength(),
           false);
     }
   } else {
-    CFX_WideString wsURL = wsHref;
+    WideString wsURL = wsHref;
     if (wsURL.Left(7) != L"http://" && wsURL.Left(6) != L"ftp://") {
       CFX_RetainPtr<CFX_DIBitmap> pBitmap =
-          pDoc->GetPDFNamedImage(wsURL.AsStringC(), iImageXDpi, iImageYDpi);
+          pDoc->GetPDFNamedImage(wsURL.AsStringView(), iImageXDpi, iImageYDpi);
       if (pBitmap) {
         bNameImage = true;
         return pBitmap;
diff --git a/xfa/fxfa/cxfa_ffwidget.h b/xfa/fxfa/cxfa_ffwidget.h
index f2ca86f774..41bb94164b 100644
--- a/xfa/fxfa/cxfa_ffwidget.h
+++ b/xfa/fxfa/cxfa_ffwidget.h
@@ -61,7 +61,7 @@ CFX_RetainPtr<CFX_DIBitmap> XFA_LoadImageFromBuffer(
     int32_t& iImageXDpi,
     int32_t& iImageYDpi);
 
-FXCODEC_IMAGE_TYPE XFA_GetImageType(const CFX_WideString& wsType);
+FXCODEC_IMAGE_TYPE XFA_GetImageType(const WideString& wsType);
 char* XFA_Base64Encode(const uint8_t* buf, int32_t buf_len);
 void XFA_RectWidthoutMargin(CFX_RectF& rt,
                             const CXFA_Margin& mg,
@@ -126,17 +126,17 @@ class CXFA_FFWidget : public CXFA_ContentLayoutItem {
   virtual bool CanSelectAll();
   virtual bool CanDelete();
   virtual bool CanDeSelect();
-  virtual bool Copy(CFX_WideString& wsCopy);
-  virtual bool Cut(CFX_WideString& wsCut);
-  virtual bool Paste(const CFX_WideString& wsPaste);
+  virtual bool Copy(WideString& wsCopy);
+  virtual bool Cut(WideString& wsCut);
+  virtual bool Paste(const WideString& wsPaste);
   virtual void SelectAll();
   virtual void Delete();
   virtual void DeSelect();
 
   // TODO(tsepez): Implement or remove.
-  void GetSuggestWords(CFX_PointF pointf, std::vector<CFX_ByteString>* pWords);
+  void GetSuggestWords(CFX_PointF pointf, std::vector<ByteString>* pWords);
   bool ReplaceSpellCheckWord(CFX_PointF pointf,
-                             const CFX_ByteStringC& bsReplace);
+                             const ByteStringView& bsReplace);
 
   CXFA_FFPageView* GetPageView() const { return m_pPageView; }
   void SetPageView(CXFA_FFPageView* pPageView) { m_pPageView = pPageView; }
@@ -146,7 +146,7 @@ class CXFA_FFWidget : public CXFA_ContentLayoutItem {
   void ModifyStatus(uint32_t dwAdded, uint32_t dwRemoved);
 
   CXFA_WidgetAcc* GetDataAcc();
-  bool GetToolTip(CFX_WideString& wsToolTip);
+  bool GetToolTip(WideString& wsToolTip);
 
   CXFA_FFDocView* GetDocView();
   void SetDocView(CXFA_FFDocView* pDocView);
@@ -154,7 +154,7 @@ class CXFA_FFWidget : public CXFA_ContentLayoutItem {
   CXFA_FFApp* GetApp();
   IXFA_AppProvider* GetAppProvider();
   void AddInvalidateRect();
-  bool GetCaptionText(CFX_WideString& wsCap);
+  bool GetCaptionText(WideString& wsCap);
   bool IsFocused() const { return !!(m_dwStatus & XFA_WidgetStatus_Focused); }
   CFX_PointF Rotate2Normal(const CFX_PointF& point);
   CFX_Matrix GetRotateMatrix();
diff --git a/xfa/fxfa/cxfa_fontmgr.cpp b/xfa/fxfa/cxfa_fontmgr.cpp
index 81e296f8a4..b47ce6b21d 100644
--- a/xfa/fxfa/cxfa_fontmgr.cpp
+++ b/xfa/fxfa/cxfa_fontmgr.cpp
@@ -1700,8 +1700,7 @@ const XFA_FONTINFO g_XFAFontsMap[] = {
 
 }  // namespace
 
-CFX_WideString XFA_LocalFontNameToEnglishName(
-    const CFX_WideStringC& wsLocalName) {
+WideString XFA_LocalFontNameToEnglishName(const WideStringView& wsLocalName) {
   uint32_t dwLocalNameHash = FX_HashCode_GetW(wsLocalName, true);
   const XFA_FONTINFO* pEnd = g_XFAFontsMap + FX_ArraySize(g_XFAFontsMap);
   const XFA_FONTINFO* pFontInfo =
@@ -1711,15 +1710,15 @@ CFX_WideString XFA_LocalFontNameToEnglishName(
                        });
   if (pFontInfo < pEnd && pFontInfo->dwFontNameHash == dwLocalNameHash)
     return pFontInfo->pPsName;
-  return CFX_WideString(wsLocalName);
+  return WideString(wsLocalName);
 }
 
 const XFA_FONTINFO* XFA_GetFontINFOByFontName(
-    const CFX_WideStringC& wsFontName) {
-  CFX_WideString wsFontNameTemp(wsFontName);
+    const WideStringView& wsFontName) {
+  WideString wsFontNameTemp(wsFontName);
   wsFontNameTemp.Remove(L' ');
   uint32_t dwCurFontNameHash =
-      FX_HashCode_GetW(wsFontNameTemp.AsStringC(), true);
+      FX_HashCode_GetW(wsFontNameTemp.AsStringView(), true);
   const XFA_FONTINFO* pEnd = g_XFAFontsMap + FX_ArraySize(g_XFAFontsMap);
   const XFA_FONTINFO* pFontInfo =
       std::lower_bound(g_XFAFontsMap, pEnd, dwCurFontNameHash,
@@ -1737,25 +1736,25 @@ CXFA_FontMgr::~CXFA_FontMgr() {}
 
 CFX_RetainPtr<CFGAS_GEFont> CXFA_FontMgr::GetFont(
     CXFA_FFDoc* hDoc,
-    const CFX_WideStringC& wsFontFamily,
+    const WideStringView& wsFontFamily,
     uint32_t dwFontStyles,
     uint16_t wCodePage) {
   uint32_t dwHash = FX_HashCode_GetW(wsFontFamily, false);
-  CFX_ByteString bsKey;
+  ByteString bsKey;
   bsKey.Format("%u%u%u", dwHash, dwFontStyles, wCodePage);
   auto iter = m_FontMap.find(bsKey);
   if (iter != m_FontMap.end())
     return iter->second;
 
-  CFX_WideString wsEnglishName = XFA_LocalFontNameToEnglishName(wsFontFamily);
+  WideString wsEnglishName = XFA_LocalFontNameToEnglishName(wsFontFamily);
   auto it = m_PDFFontMgrMap.find(hDoc);
   CXFA_PDFFontMgr* pMgr =
       it != m_PDFFontMgrMap.end() ? it->second.get() : nullptr;
   CPDF_Font* pPDFFont = nullptr;
   CFX_RetainPtr<CFGAS_GEFont> pFont;
   if (pMgr) {
-    pFont =
-        pMgr->GetFont(wsEnglishName.AsStringC(), dwFontStyles, &pPDFFont, true);
+    pFont = pMgr->GetFont(wsEnglishName.AsStringView(), dwFontStyles, &pPDFFont,
+                          true);
     if (pFont)
       return pFont;
   }
@@ -1764,7 +1763,7 @@ CFX_RetainPtr<CFGAS_GEFont> CXFA_FontMgr::GetFont(
 
   if (!pFont && pMgr) {
     pPDFFont = nullptr;
-    pFont = pMgr->GetFont(wsEnglishName.AsStringC(), dwFontStyles, &pPDFFont,
+    pFont = pMgr->GetFont(wsEnglishName.AsStringView(), dwFontStyles, &pPDFFont,
                           false);
     if (pFont)
       return pFont;
diff --git a/xfa/fxfa/cxfa_fontmgr.h b/xfa/fxfa/cxfa_fontmgr.h
index f66ca8f314..e5db565147 100644
--- a/xfa/fxfa/cxfa_fontmgr.h
+++ b/xfa/fxfa/cxfa_fontmgr.h
@@ -29,10 +29,8 @@ struct XFA_FONTINFO {
   uint16_t wCodePage;
 };
 
-CFX_WideString XFA_LocalFontNameToEnglishName(
-    const CFX_WideStringC& wsLocalName);
-const XFA_FONTINFO* XFA_GetFontINFOByFontName(
-    const CFX_WideStringC& wsFontName);
+WideString XFA_LocalFontNameToEnglishName(const WideStringView& wsLocalName);
+const XFA_FONTINFO* XFA_GetFontINFOByFontName(const WideStringView& wsFontName);
 
 class CXFA_FontMgr {
  public:
@@ -40,7 +38,7 @@ class CXFA_FontMgr {
   ~CXFA_FontMgr();
 
   CFX_RetainPtr<CFGAS_GEFont> GetFont(CXFA_FFDoc* hDoc,
-                                      const CFX_WideStringC& wsFontFamily,
+                                      const WideStringView& wsFontFamily,
                                       uint32_t dwFontStyles,
                                       uint16_t wCodePage = 0xFFFF);
   void LoadDocFonts(CXFA_FFDoc* hDoc);
@@ -50,7 +48,7 @@ class CXFA_FontMgr {
  private:
   std::unique_ptr<CXFA_DefFontMgr> m_pDefFontMgr;
   std::map<CXFA_FFDoc*, std::unique_ptr<CXFA_PDFFontMgr>> m_PDFFontMgrMap;
-  std::map<CFX_ByteString, CFX_RetainPtr<CFGAS_GEFont>> m_FontMap;
+  std::map<ByteString, CFX_RetainPtr<CFGAS_GEFont>> m_FontMap;
 };
 
 #endif  //  XFA_FXFA_CXFA_FONTMGR_H_
diff --git a/xfa/fxfa/cxfa_fwltheme.cpp b/xfa/fxfa/cxfa_fwltheme.cpp
index ec0ce4586a..35456eff16 100644
--- a/xfa/fxfa/cxfa_fwltheme.cpp
+++ b/xfa/fxfa/cxfa_fwltheme.cpp
@@ -116,7 +116,7 @@ void CXFA_FWLTheme::DrawText(CFWL_ThemeText* pParams) {
       mtPart.Concat(*pMatrix);
 
     m_pTextOut->SetMatrix(mtPart);
-    m_pTextOut->DrawLogicText(pRenderDevice, pParams->m_wsText.AsStringC(),
+    m_pTextOut->DrawLogicText(pRenderDevice, pParams->m_wsText.AsStringView(),
                               pParams->m_rtPart);
     return;
   }
@@ -141,7 +141,7 @@ void CXFA_FWLTheme::DrawText(CFWL_ThemeText* pParams) {
     mtPart.Concat(*pMatrix);
 
   m_pTextOut->SetMatrix(mtPart);
-  m_pTextOut->DrawLogicText(pRenderDevice, pParams->m_wsText.AsStringC(),
+  m_pTextOut->DrawLogicText(pRenderDevice, pParams->m_wsText.AsStringView(),
                             pParams->m_rtPart);
 }
 
diff --git a/xfa/fxfa/cxfa_fwltheme.h b/xfa/fxfa/cxfa_fwltheme.h
index 9fbb068cc3..48fb744cb2 100644
--- a/xfa/fxfa/cxfa_fwltheme.h
+++ b/xfa/fxfa/cxfa_fwltheme.h
@@ -60,7 +60,7 @@ class CXFA_FWLTheme final : public IFWL_ThemeProvider {
   std::unique_ptr<CFWL_BarcodeTP> m_pBarcodeTP;
   std::unique_ptr<CFDE_TextOut> m_pTextOut;
   CFX_RetainPtr<CFGAS_GEFont> m_pCalendarFont;
-  CFX_WideString m_wsResource;
+  WideString m_wsResource;
   CFX_UnownedPtr<CXFA_FFApp> const m_pApp;
   CFX_RectF m_Rect;
 };
diff --git a/xfa/fxfa/cxfa_linkuserdata.h b/xfa/fxfa/cxfa_linkuserdata.h
index b3ee74a051..7a9648c9b5 100644
--- a/xfa/fxfa/cxfa_linkuserdata.h
+++ b/xfa/fxfa/cxfa_linkuserdata.h
@@ -22,7 +22,7 @@ class CXFA_LinkUserData : public CFX_Retainable {
   explicit CXFA_LinkUserData(wchar_t* pszText);
   ~CXFA_LinkUserData() override;
 
-  CFX_WideString m_wsURLContent;
+  WideString m_wsURLContent;
 };
 
 #endif  // XFA_FXFA_CXFA_LINKUSERDATA_H_
diff --git a/xfa/fxfa/cxfa_pdffontmgr.cpp b/xfa/fxfa/cxfa_pdffontmgr.cpp
index 30af697e26..9a90e54dec 100644
--- a/xfa/fxfa/cxfa_pdffontmgr.cpp
+++ b/xfa/fxfa/cxfa_pdffontmgr.cpp
@@ -28,7 +28,7 @@ CXFA_PDFFontMgr::CXFA_PDFFontMgr(CXFA_FFDoc* pDoc) : m_pDoc(pDoc) {}
 CXFA_PDFFontMgr::~CXFA_PDFFontMgr() {}
 
 CFX_RetainPtr<CFGAS_GEFont> CXFA_PDFFontMgr::FindFont(
-    const CFX_ByteString& strPsName,
+    const ByteString& strPsName,
     bool bBold,
     bool bItalic,
     CPDF_Font** pDstPDFFont,
@@ -46,13 +46,13 @@ CFX_RetainPtr<CFGAS_GEFont> CXFA_PDFFontMgr::FindFont(
   if (!pFontSetDict)
     return nullptr;
 
-  CFX_ByteString name = strPsName;
+  ByteString name = strPsName;
   name.Remove(' ');
   CFGAS_FontMgr* pFDEFontMgr = m_pDoc->GetApp()->GetFDEFontMgr();
   for (const auto& it : *pFontSetDict) {
-    const CFX_ByteString& key = it.first;
+    const ByteString& key = it.first;
     CPDF_Object* pObj = it.second.get();
-    if (!PsNameMatchDRFontName(name.AsStringC(), bBold, bItalic, key,
+    if (!PsNameMatchDRFontName(name.AsStringView(), bBold, bItalic, key,
                                bStrictMatch)) {
       continue;
     }
@@ -74,21 +74,20 @@ CFX_RetainPtr<CFGAS_GEFont> CXFA_PDFFontMgr::FindFont(
 }
 
 CFX_RetainPtr<CFGAS_GEFont> CXFA_PDFFontMgr::GetFont(
-    const CFX_WideStringC& wsFontFamily,
+    const WideStringView& wsFontFamily,
     uint32_t dwFontStyles,
     CPDF_Font** pPDFFont,
     bool bStrictMatch) {
   uint32_t dwHashCode = FX_HashCode_GetW(wsFontFamily, false);
-  CFX_ByteString strKey;
+  ByteString strKey;
   strKey.Format("%u%u", dwHashCode, dwFontStyles);
   auto it = m_FontMap.find(strKey);
   if (it != m_FontMap.end())
     return it->second;
-  CFX_ByteString bsPsName =
-      CFX_ByteString::FromUnicode(CFX_WideString(wsFontFamily));
+  ByteString bsPsName = ByteString::FromUnicode(WideString(wsFontFamily));
   bool bBold = (dwFontStyles & FX_FONTSTYLE_Bold) == FX_FONTSTYLE_Bold;
   bool bItalic = (dwFontStyles & FX_FONTSTYLE_Italic) == FX_FONTSTYLE_Italic;
-  CFX_ByteString strFontName = PsNameToFontName(bsPsName, bBold, bItalic);
+  ByteString strFontName = PsNameToFontName(bsPsName, bBold, bItalic);
   CFX_RetainPtr<CFGAS_GEFont> pFont =
       FindFont(strFontName, bBold, bItalic, pPDFFont, bStrictMatch);
   if (pFont)
@@ -96,10 +95,9 @@ CFX_RetainPtr<CFGAS_GEFont> CXFA_PDFFontMgr::GetFont(
   return pFont;
 }
 
-CFX_ByteString CXFA_PDFFontMgr::PsNameToFontName(
-    const CFX_ByteString& strPsName,
-    bool bBold,
-    bool bItalic) {
+ByteString CXFA_PDFFontMgr::PsNameToFontName(const ByteString& strPsName,
+                                             bool bBold,
+                                             bool bItalic) {
   for (size_t i = 0; i < FX_ArraySize(g_XFAPDFFontName); ++i) {
     if (strPsName == g_XFAPDFFontName[i][0]) {
       size_t index = 1;
@@ -113,12 +111,12 @@ CFX_ByteString CXFA_PDFFontMgr::PsNameToFontName(
   return strPsName;
 }
 
-bool CXFA_PDFFontMgr::PsNameMatchDRFontName(const CFX_ByteStringC& bsPsName,
+bool CXFA_PDFFontMgr::PsNameMatchDRFontName(const ByteStringView& bsPsName,
                                             bool bBold,
                                             bool bItalic,
-                                            const CFX_ByteString& bsDRFontName,
+                                            const ByteString& bsDRFontName,
                                             bool bStrictMatch) {
-  CFX_ByteString bsDRName = bsDRFontName;
+  ByteString bsDRName = bsDRFontName;
   bsDRName.Remove('-');
   FX_STRSIZE iPsLen = bsPsName.GetLength();
   auto nIndex = bsDRName.Find(bsPsName);
@@ -152,7 +150,7 @@ bool CXFA_PDFFontMgr::PsNameMatchDRFontName(const CFX_ByteStringC& bsPsName,
       return false;
 
     if (iDifferLength > 1) {
-      CFX_ByteString bsDRTailer = bsDRName.Right(iDifferLength);
+      ByteString bsDRTailer = bsDRName.Right(iDifferLength);
       if (bsDRTailer == "MT" || bsDRTailer == "PSMT" ||
           bsDRTailer == "Regular" || bsDRTailer == "Reg") {
         return true;
diff --git a/xfa/fxfa/cxfa_pdffontmgr.h b/xfa/fxfa/cxfa_pdffontmgr.h
index df8ab28e08..4c8941f8f0 100644
--- a/xfa/fxfa/cxfa_pdffontmgr.h
+++ b/xfa/fxfa/cxfa_pdffontmgr.h
@@ -25,7 +25,7 @@ class CXFA_PDFFontMgr : public CFX_Observable<CXFA_PDFFontMgr> {
   explicit CXFA_PDFFontMgr(CXFA_FFDoc* pDoc);
   ~CXFA_PDFFontMgr();
 
-  CFX_RetainPtr<CFGAS_GEFont> GetFont(const CFX_WideStringC& wsFontFamily,
+  CFX_RetainPtr<CFGAS_GEFont> GetFont(const WideStringView& wsFontFamily,
                                       uint32_t dwFontStyles,
                                       CPDF_Font** pPDFFont,
                                       bool bStrictMatch);
@@ -36,23 +36,23 @@ class CXFA_PDFFontMgr : public CFX_Observable<CXFA_PDFFontMgr> {
   void SetFont(const CFX_RetainPtr<CFGAS_GEFont>& pFont, CPDF_Font* pPDFFont);
 
  private:
-  CFX_RetainPtr<CFGAS_GEFont> FindFont(const CFX_ByteString& strFamilyName,
+  CFX_RetainPtr<CFGAS_GEFont> FindFont(const ByteString& strFamilyName,
                                        bool bBold,
                                        bool bItalic,
                                        CPDF_Font** pPDFFont,
                                        bool bStrictMatch);
-  CFX_ByteString PsNameToFontName(const CFX_ByteString& strPsName,
-                                  bool bBold,
-                                  bool bItalic);
-  bool PsNameMatchDRFontName(const CFX_ByteStringC& bsPsName,
+  ByteString PsNameToFontName(const ByteString& strPsName,
+                              bool bBold,
+                              bool bItalic);
+  bool PsNameMatchDRFontName(const ByteStringView& bsPsName,
                              bool bBold,
                              bool bItalic,
-                             const CFX_ByteString& bsDRFontName,
+                             const ByteString& bsDRFontName,
                              bool bStrictMatch);
 
   CFX_UnownedPtr<CXFA_FFDoc> const m_pDoc;
   std::map<CFX_RetainPtr<CFGAS_GEFont>, CPDF_Font*> m_FDE2PDFFont;
-  std::map<CFX_ByteString, CFX_RetainPtr<CFGAS_GEFont>> m_FontMap;
+  std::map<ByteString, CFX_RetainPtr<CFGAS_GEFont>> m_FontMap;
 };
 
 #endif  // XFA_FXFA_CXFA_PDFFONTMGR_H_
diff --git a/xfa/fxfa/cxfa_textlayout.cpp b/xfa/fxfa/cxfa_textlayout.cpp
index 9c4e36739d..bbc61d40f2 100644
--- a/xfa/fxfa/cxfa_textlayout.cpp
+++ b/xfa/fxfa/cxfa_textlayout.cpp
@@ -79,7 +79,7 @@ CFX_XMLNode* CXFA_TextLayout::GetXMLContainerNode() {
        pXMLChild = pXMLChild->GetNodeItem(CFX_XMLNode::NextSibling)) {
     if (pXMLChild->GetType() == FX_XMLNODE_Element) {
       CFX_XMLElement* pXMLElement = static_cast<CFX_XMLElement*>(pXMLChild);
-      CFX_WideString wsTag = pXMLElement->GetLocalTagName();
+      WideString wsTag = pXMLElement->GetLocalTagName();
       if (wsTag == L"body" || wsTag == L"html") {
         pXMLContainer = pXMLChild;
         break;
@@ -237,7 +237,7 @@ void CXFA_TextLayout::InitBreak(CFX_CSSComputedStyle* pStyle,
   m_pBreak->SetCharSpace(pStyle->GetLetterSpacing().GetValue());
 }
 
-int32_t CXFA_TextLayout::GetText(CFX_WideString& wsText) {
+int32_t CXFA_TextLayout::GetText(WideString& wsText) {
   GetTextDataNode();
   wsText.clear();
   if (!m_bRichText)
@@ -676,7 +676,7 @@ void CXFA_TextLayout::LoadText(CXFA_Node* pNode,
     }
   }
 
-  CFX_WideString wsText = pNode->GetContent();
+  WideString wsText = pNode->GetContent();
   wsText.TrimRight(L" ");
   bool bRet = AppendChar(wsText, fLinePos, fSpaceAbove, bSavePieces);
   if (bRet && m_pLoader)
@@ -704,7 +704,7 @@ bool CXFA_TextLayout::LoadRichText(
   bool bContentNode = false;
   float fSpaceBelow = 0;
   CFX_RetainPtr<CFX_CSSComputedStyle> pStyle;
-  CFX_WideString wsName;
+  WideString wsName;
   if (bEndBreak) {
     bool bCurOl = false;
     bool bCurLi = false;
@@ -749,7 +749,7 @@ bool CXFA_TextLayout::LoadRichText(
 
         if (wsName == L"a") {
           ASSERT(pElement);
-          CFX_WideString wsLinkContent = pElement->GetString(L"href");
+          WideString wsLinkContent = pElement->GetString(L"href");
           if (!wsLinkContent.IsEmpty()) {
             pLinkData = pdfium::MakeRetain<CXFA_LinkUserData>(
                 wsLinkContent.GetBuffer(wsLinkContent.GetLength()));
@@ -761,7 +761,7 @@ bool CXFA_TextLayout::LoadRichText(
             bContentNode ? pParentStyle.Get() : pStyle.Get());
         bool bSpaceRun = m_textParser.IsSpaceRun(
             bContentNode ? pParentStyle.Get() : pStyle.Get());
-        CFX_WideString wsText;
+        WideString wsText;
         if (bContentNode && iTabCount == 0) {
           wsText = static_cast<CFX_XMLText*>(pXMLNode)->GetText();
         } else if (wsName == L"br") {
@@ -771,7 +771,7 @@ bool CXFA_TextLayout::LoadRichText(
           if (bIsOl)
             wsText.Format(L"%d.  ", iLiCount);
           else
-            wsText = 0x00B7 + CFX_WideStringC(L"  ", 1);
+            wsText = 0x00B7 + WideStringView(L"  ", 1);
         } else if (!bContentNode) {
           if (iTabCount > 0) {
             while (iTabCount-- > 0)
@@ -874,7 +874,7 @@ bool CXFA_TextLayout::LoadRichText(
   return true;
 }
 
-bool CXFA_TextLayout::AppendChar(const CFX_WideString& wsText,
+bool CXFA_TextLayout::AppendChar(const WideString& wsText,
                                  float& fLinePos,
                                  float fSpaceAbove,
                                  bool bSavePieces) {
@@ -915,7 +915,7 @@ bool CXFA_TextLayout::IsEnd(bool bSavePieces) {
   return false;
 }
 
-void CXFA_TextLayout::ProcessText(CFX_WideString& wsText) {
+void CXFA_TextLayout::ProcessText(WideString& wsText) {
   int32_t iLen = wsText.GetLength();
   if (iLen == 0)
     return;
diff --git a/xfa/fxfa/cxfa_textlayout.h b/xfa/fxfa/cxfa_textlayout.h
index 338d3bea50..50ee83fd75 100644
--- a/xfa/fxfa/cxfa_textlayout.h
+++ b/xfa/fxfa/cxfa_textlayout.h
@@ -33,7 +33,7 @@ class CXFA_TextLayout {
   explicit CXFA_TextLayout(CXFA_TextProvider* pTextProvider);
   ~CXFA_TextLayout();
 
-  int32_t GetText(CFX_WideString& wsText);
+  int32_t GetText(WideString& wsText);
   float GetLayoutHeight();
   float StartLayout(float fWidth = -1);
   bool DoLayout(int32_t iBlockIndex,
@@ -85,7 +85,7 @@ class CXFA_TextLayout {
                     bool bEndBreak = true,
                     bool bIsOl = false,
                     int32_t iLiCount = 0);
-  bool AppendChar(const CFX_WideString& wsText,
+  bool AppendChar(const WideString& wsText,
                   float& fLinePos,
                   float fSpaceAbove,
                   bool bSavePieces);
@@ -95,7 +95,7 @@ class CXFA_TextLayout {
                       bool bEndBreak = false);
   void EndBreak(CFX_BreakType dwStatus, float& fLinePos, bool bDefault);
   bool IsEnd(bool bSavePieces);
-  void ProcessText(CFX_WideString& wsText);
+  void ProcessText(WideString& wsText);
   void UpdateAlign(float fHeight, float fBottom);
   void RenderString(CFX_RenderDevice* pDevice,
                     CXFA_PieceLine* pPieceLine,
diff --git a/xfa/fxfa/cxfa_textparser.cpp b/xfa/fxfa/cxfa_textparser.cpp
index 659ec9cc6d..3c78a8686d 100644
--- a/xfa/fxfa/cxfa_textparser.cpp
+++ b/xfa/fxfa/cxfa_textparser.cpp
@@ -244,7 +244,7 @@ void CXFA_TextParser::ParseRichText(CFX_XMLNode* pXMLNode,
   }
 }
 
-bool CXFA_TextParser::TagValidate(const CFX_WideString& wsName) const {
+bool CXFA_TextParser::TagValidate(const WideString& wsName) const {
   static const uint32_t s_XFATagName[] = {
       0x61,        // a
       0x62,        // b
@@ -263,21 +263,21 @@ bool CXFA_TextParser::TagValidate(const CFX_WideString& wsName) const {
   static const int32_t s_iCount = FX_ArraySize(s_XFATagName);
 
   return std::binary_search(s_XFATagName, s_XFATagName + s_iCount,
-                            FX_HashCode_GetW(wsName.AsStringC(), true));
+                            FX_HashCode_GetW(wsName.AsStringView(), true));
 }
 
 std::unique_ptr<CXFA_TextParser::TagProvider> CXFA_TextParser::ParseTagInfo(
     CFX_XMLNode* pXMLNode) {
   auto tagProvider = pdfium::MakeUnique<TagProvider>();
 
-  CFX_WideString wsName;
+  WideString wsName;
   if (pXMLNode->GetType() == FX_XMLNODE_Element) {
     CFX_XMLElement* pXMLElement = static_cast<CFX_XMLElement*>(pXMLNode);
     wsName = pXMLElement->GetLocalTagName();
     tagProvider->SetTagName(wsName);
     tagProvider->m_bTagAvailable = TagValidate(wsName);
 
-    CFX_WideString wsValue = pXMLElement->GetString(L"style");
+    WideString wsValue = pXMLElement->GetString(L"style");
     if (!wsValue.IsEmpty())
       tagProvider->SetAttribute(L"style", wsValue);
   } else if (pXMLNode->GetType() == FX_XMLNODE_Text) {
@@ -293,21 +293,21 @@ int32_t CXFA_TextParser::GetVAlign(CXFA_TextProvider* pTextProvider) const {
 }
 
 float CXFA_TextParser::GetTabInterval(CFX_CSSComputedStyle* pStyle) const {
-  CFX_WideString wsValue;
+  WideString wsValue;
   if (pStyle && pStyle->GetCustomStyle(L"tab-interval", wsValue))
-    return CXFA_Measurement(wsValue.AsStringC()).ToUnit(XFA_UNIT_Pt);
+    return CXFA_Measurement(wsValue.AsStringView()).ToUnit(XFA_UNIT_Pt);
   return 36;
 }
 
 int32_t CXFA_TextParser::CountTabs(CFX_CSSComputedStyle* pStyle) const {
-  CFX_WideString wsValue;
+  WideString wsValue;
   if (pStyle && pStyle->GetCustomStyle(L"xfa-tab-count", wsValue))
     return wsValue.GetInteger();
   return 0;
 }
 
 bool CXFA_TextParser::IsSpaceRun(CFX_CSSComputedStyle* pStyle) const {
-  CFX_WideString wsValue;
+  WideString wsValue;
   if (pStyle && pStyle->GetCustomStyle(L"xfa-spacerun", wsValue)) {
     wsValue.MakeLower();
     return wsValue == L"yes";
@@ -318,7 +318,7 @@ bool CXFA_TextParser::IsSpaceRun(CFX_CSSComputedStyle* pStyle) const {
 CFX_RetainPtr<CFGAS_GEFont> CXFA_TextParser::GetFont(
     CXFA_TextProvider* pTextProvider,
     CFX_CSSComputedStyle* pStyle) const {
-  CFX_WideStringC wsFamily = L"Courier";
+  WideStringView wsFamily = L"Courier";
   uint32_t dwStyle = 0;
   CXFA_Font font = pTextProvider->GetFontNode();
   if (font) {
@@ -332,7 +332,7 @@ CFX_RetainPtr<CFGAS_GEFont> CXFA_TextParser::GetFont(
   if (pStyle) {
     int32_t iCount = pStyle->CountFontFamilies();
     if (iCount > 0)
-      wsFamily = pStyle->GetFontFamily(iCount - 1).AsStringC();
+      wsFamily = pStyle->GetFontFamily(iCount - 1).AsStringView();
 
     dwStyle = 0;
     if (pStyle->GetFontWeight() > FXFONT_FW_NORMAL)
@@ -361,7 +361,7 @@ int32_t CXFA_TextParser::GetHorScale(CXFA_TextProvider* pTextProvider,
                                      CFX_CSSComputedStyle* pStyle,
                                      CFX_XMLNode* pXMLNode) const {
   if (pStyle) {
-    CFX_WideString wsValue;
+    WideString wsValue;
     if (pStyle->GetCustomStyle(L"xfa-font-horizontal-scale", wsValue))
       return wsValue.GetInteger();
 
@@ -387,7 +387,7 @@ int32_t CXFA_TextParser::GetHorScale(CXFA_TextProvider* pTextProvider,
 int32_t CXFA_TextParser::GetVerScale(CXFA_TextProvider* pTextProvider,
                                      CFX_CSSComputedStyle* pStyle) const {
   if (pStyle) {
-    CFX_WideString wsValue;
+    WideString wsValue;
     if (pStyle->GetCustomStyle(L"xfa-font-vertical-scale", wsValue))
       return wsValue.GetInteger();
   }
@@ -418,7 +418,7 @@ void CXFA_TextParser::GetUnderline(CXFA_TextProvider* pTextProvider,
   else if (dwDecoration & CFX_CSSTEXTDECORATION_Underline)
     iUnderline = 1;
 
-  CFX_WideString wsValue;
+  WideString wsValue;
   if (pStyle->GetCustomStyle(L"underlinePeriod", wsValue)) {
     if (wsValue == L"word")
       iPeriod = XFA_ATTRIBUTEENUM_Word;
@@ -487,7 +487,7 @@ float CXFA_TextParser::GetLineHeight(CXFA_TextProvider* pTextProvider,
 
 bool CXFA_TextParser::GetEmbbedObj(CXFA_TextProvider* pTextProvider,
                                    CFX_XMLNode* pXMLNode,
-                                   CFX_WideString& wsValue) {
+                                   WideString& wsValue) {
   wsValue.clear();
   if (!pXMLNode)
     return false;
@@ -495,13 +495,13 @@ bool CXFA_TextParser::GetEmbbedObj(CXFA_TextProvider* pTextProvider,
   bool bRet = false;
   if (pXMLNode->GetType() == FX_XMLNODE_Element) {
     CFX_XMLElement* pElement = static_cast<CFX_XMLElement*>(pXMLNode);
-    CFX_WideString wsAttr = pElement->GetString(L"xfa:embed");
+    WideString wsAttr = pElement->GetString(L"xfa:embed");
     if (wsAttr.IsEmpty())
       return false;
     if (wsAttr[0] == L'#')
       wsAttr.Delete(0);
 
-    CFX_WideString ws = pElement->GetString(L"xfa:embedType");
+    WideString ws = pElement->GetString(L"xfa:embedType");
     if (ws.IsEmpty())
       ws = L"som";
     else
@@ -537,7 +537,7 @@ bool CXFA_TextParser::GetTabstops(CFX_CSSComputedStyle* pStyle,
   if (!pStyle || !pTabstopContext)
     return false;
 
-  CFX_WideString wsValue;
+  WideString wsValue;
   if (!pStyle->GetCustomStyle(L"xfa-tab-stops", wsValue) &&
       !pStyle->GetCustomStyle(L"tab-stops", wsValue)) {
     return false;
@@ -547,7 +547,7 @@ bool CXFA_TextParser::GetTabstops(CFX_CSSComputedStyle* pStyle,
   const wchar_t* pTabStops = wsValue.c_str();
   int32_t iCur = 0;
   int32_t iLast = 0;
-  CFX_WideString wsAlign;
+  WideString wsAlign;
   TabStopStatus eStatus = TabStopStatus::None;
   wchar_t ch;
   while (iCur < iLength) {
@@ -563,7 +563,7 @@ bool CXFA_TextParser::GetTabstops(CFX_CSSComputedStyle* pStyle,
         break;
       case TabStopStatus::Alignment:
         if (ch == ' ') {
-          wsAlign = CFX_WideStringC(pTabStops + iLast, iCur - iLast);
+          wsAlign = WideStringView(pTabStops + iLast, iCur - iLast);
           eStatus = TabStopStatus::StartLeader;
           iCur++;
           while (iCur < iLength && pTabStops[iCur] <= ' ')
@@ -598,8 +598,8 @@ bool CXFA_TextParser::GetTabstops(CFX_CSSComputedStyle* pStyle,
         break;
       case TabStopStatus::Location:
         if (ch == ' ') {
-          uint32_t dwHashCode = FX_HashCode_GetW(wsAlign.AsStringC(), true);
-          CXFA_Measurement ms(CFX_WideStringC(pTabStops + iLast, iCur - iLast));
+          uint32_t dwHashCode = FX_HashCode_GetW(wsAlign.AsStringView(), true);
+          CXFA_Measurement ms(WideStringView(pTabStops + iLast, iCur - iLast));
           float fPos = ms.ToUnit(XFA_UNIT_Pt);
           pTabstopContext->Append(dwHashCode, fPos);
           wsAlign.clear();
@@ -613,8 +613,8 @@ bool CXFA_TextParser::GetTabstops(CFX_CSSComputedStyle* pStyle,
   }
 
   if (!wsAlign.IsEmpty()) {
-    uint32_t dwHashCode = FX_HashCode_GetW(wsAlign.AsStringC(), true);
-    CXFA_Measurement ms(CFX_WideStringC(pTabStops + iLast, iCur - iLast));
+    uint32_t dwHashCode = FX_HashCode_GetW(wsAlign.AsStringView(), true);
+    CXFA_Measurement ms(WideStringView(pTabStops + iLast, iCur - iLast));
     float fPos = ms.ToUnit(XFA_UNIT_Pt);
     pTabstopContext->Append(dwHashCode, fPos);
   }
diff --git a/xfa/fxfa/cxfa_textparser.h b/xfa/fxfa/cxfa_textparser.h
index 567aff0189..ee5c38d2af 100644
--- a/xfa/fxfa/cxfa_textparser.h
+++ b/xfa/fxfa/cxfa_textparser.h
@@ -78,11 +78,11 @@ class CXFA_TextParser {
 
   bool GetEmbbedObj(CXFA_TextProvider* pTextProvider,
                     CFX_XMLNode* pXMLNode,
-                    CFX_WideString& wsValue);
+                    WideString& wsValue);
   CXFA_TextParseContext* GetParseContextFromMap(CFX_XMLNode* pXMLNode);
 
  protected:
-  bool TagValidate(const CFX_WideString& str) const;
+  bool TagValidate(const WideString& str) const;
 
  private:
   class TagProvider {
@@ -90,15 +90,14 @@ class CXFA_TextParser {
     TagProvider();
     ~TagProvider();
 
-    CFX_WideString GetTagName() { return m_wsTagName; }
+    WideString GetTagName() { return m_wsTagName; }
 
-    void SetTagName(const CFX_WideString& wsName) { m_wsTagName = wsName; }
-    void SetAttribute(const CFX_WideString& wsAttr,
-                      const CFX_WideString& wsValue) {
+    void SetTagName(const WideString& wsName) { m_wsTagName = wsName; }
+    void SetAttribute(const WideString& wsAttr, const WideString& wsValue) {
       m_Attributes.insert({wsAttr, wsValue});
     }
 
-    CFX_WideString GetAttribute(const CFX_WideString& wsAttr) {
+    WideString GetAttribute(const WideString& wsAttr) {
       return m_Attributes[wsAttr];
     }
 
@@ -106,8 +105,8 @@ class CXFA_TextParser {
     bool m_bContent;
 
    private:
-    CFX_WideString m_wsTagName;
-    std::map<CFX_WideString, CFX_WideString> m_Attributes;
+    WideString m_wsTagName;
+    std::map<WideString, WideString> m_Attributes;
   };
 
   void InitCSSData(CXFA_TextProvider* pTextProvider);
diff --git a/xfa/fxfa/cxfa_textpiece.h b/xfa/fxfa/cxfa_textpiece.h
index a1f100cf0b..4ea5a4158c 100644
--- a/xfa/fxfa/cxfa_textpiece.h
+++ b/xfa/fxfa/cxfa_textpiece.h
@@ -21,7 +21,7 @@ class CXFA_TextPiece {
   CXFA_TextPiece();
   ~CXFA_TextPiece();
 
-  CFX_WideString szText;
+  WideString szText;
   std::vector<int32_t> Widths;
   int32_t iChars;
   int32_t iHorScale;
diff --git a/xfa/fxfa/cxfa_textprovider.cpp b/xfa/fxfa/cxfa_textprovider.cpp
index 16a2b58a8a..9f1ecd51c3 100644
--- a/xfa/fxfa/cxfa_textprovider.cpp
+++ b/xfa/fxfa/cxfa_textprovider.cpp
@@ -43,7 +43,7 @@ CXFA_Node* CXFA_TextProvider::GetTextNode(bool& bRichText) {
 
     CXFA_Node* pChildNode = pValueNode->GetNodeItem(XFA_NODEITEM_FirstChild);
     if (pChildNode && pChildNode->GetElementType() == XFA_Element::ExData) {
-      CFX_WideString wsContentType;
+      WideString wsContentType;
       pChildNode->GetAttribute(XFA_ATTRIBUTE_ContentType, wsContentType, false);
       if (wsContentType == L"text/html")
         bRichText = true;
@@ -80,7 +80,7 @@ CXFA_Node* CXFA_TextProvider::GetTextNode(bool& bRichText) {
 
     CXFA_Node* pChildNode = pValueNode->GetNodeItem(XFA_NODEITEM_FirstChild);
     if (pChildNode && pChildNode->GetElementType() == XFA_Element::ExData) {
-      CFX_WideString wsContentType;
+      WideString wsContentType;
       pChildNode->GetAttribute(XFA_ATTRIBUTE_ContentType, wsContentType, false);
       if (wsContentType == L"text/html")
         bRichText = true;
@@ -95,7 +95,7 @@ CXFA_Node* CXFA_TextProvider::GetTextNode(bool& bRichText) {
 
   CXFA_Node* pNode = pItemNode->GetNodeItem(XFA_NODEITEM_FirstChild);
   while (pNode) {
-    CFX_WideStringC wsName;
+    WideStringView wsName;
     pNode->TryCData(XFA_ATTRIBUTE_Name, wsName);
     if (m_eType == XFA_TEXTPROVIDERTYPE_Rollover && wsName == L"rollover")
       return pNode;
@@ -135,8 +135,8 @@ bool CXFA_TextProvider::IsCheckButtonAndAutoWidth() {
 
 bool CXFA_TextProvider::GetEmbbedObj(bool bURI,
                                      bool bRaw,
-                                     const CFX_WideString& wsAttr,
-                                     CFX_WideString& wsValue) {
+                                     const WideString& wsAttr,
+                                     WideString& wsValue) {
   if (m_eType != XFA_TEXTPROVIDERTYPE_Text)
     return false;
 
@@ -149,11 +149,12 @@ bool CXFA_TextProvider::GetEmbbedObj(bool bURI,
   CXFA_Node* pIDNode = nullptr;
   CXFA_WidgetAcc* pEmbAcc = nullptr;
   if (pParent)
-    pIDNode = pDocument->GetNodeByID(pParent, wsAttr.AsStringC());
+    pIDNode = pDocument->GetNodeByID(pParent, wsAttr.AsStringView());
 
   if (!pIDNode) {
     pIDNode = pDocument->GetNodeByID(
-        ToNode(pDocument->GetXFAObject(XFA_HASHCODE_Form)), wsAttr.AsStringC());
+        ToNode(pDocument->GetXFAObject(XFA_HASHCODE_Form)),
+        wsAttr.AsStringView());
   }
   if (pIDNode)
     pEmbAcc = static_cast<CXFA_WidgetAcc*>(pIDNode->GetWidgetData());
diff --git a/xfa/fxfa/cxfa_textprovider.h b/xfa/fxfa/cxfa_textprovider.h
index 0772490d90..d648b94495 100644
--- a/xfa/fxfa/cxfa_textprovider.h
+++ b/xfa/fxfa/cxfa_textprovider.h
@@ -39,8 +39,8 @@ class CXFA_TextProvider {
   CXFA_FFDoc* GetDocNode() { return m_pWidgetAcc->GetDoc(); }
   bool GetEmbbedObj(bool bURI,
                     bool bRaw,
-                    const CFX_WideString& wsAttr,
-                    CFX_WideString& wsValue);
+                    const WideString& wsAttr,
+                    WideString& wsValue);
 
  private:
   CXFA_WidgetAcc* m_pWidgetAcc;
diff --git a/xfa/fxfa/cxfa_widgetacc.cpp b/xfa/fxfa/cxfa_widgetacc.cpp
index 972a95eac4..791b814d9e 100644
--- a/xfa/fxfa/cxfa_widgetacc.cpp
+++ b/xfa/fxfa/cxfa_widgetacc.cpp
@@ -160,15 +160,15 @@ CXFA_WidgetAcc::CXFA_WidgetAcc(CXFA_FFDocView* pDocView, CXFA_Node* pNode)
 
 CXFA_WidgetAcc::~CXFA_WidgetAcc() {}
 
-bool CXFA_WidgetAcc::GetName(CFX_WideString& wsName, int32_t iNameType) {
+bool CXFA_WidgetAcc::GetName(WideString& wsName, int32_t iNameType) {
   if (iNameType == 0) {
     m_pNode->TryCData(XFA_ATTRIBUTE_Name, wsName);
     return !wsName.IsEmpty();
   }
   m_pNode->GetSOMExpression(wsName);
   if (iNameType == 2 && wsName.GetLength() >= 15) {
-    CFX_WideStringC wsPre = L"xfa[0].form[0].";
-    if (wsPre == CFX_WideStringC(wsName.c_str(), wsPre.GetLength()))
+    WideStringView wsPre = L"xfa[0].form[0].";
+    if (wsPre == WideStringView(wsName.c_str(), wsPre.GetLength()))
       wsName.Delete(0, wsPre.GetLength());
   }
   return true;
@@ -187,13 +187,13 @@ bool CXFA_WidgetAcc::ProcessValueChanged() {
 }
 
 void CXFA_WidgetAcc::ResetData() {
-  CFX_WideString wsValue;
+  WideString wsValue;
   XFA_Element eUIType = GetUIType();
   switch (eUIType) {
     case XFA_Element::ImageEdit: {
       CXFA_Value imageValue = GetDefaultValue();
       CXFA_Image image = imageValue.GetImage();
-      CFX_WideString wsContentType, wsHref;
+      WideString wsContentType, wsHref;
       if (image) {
         image.GetContent(wsValue);
         image.GetContentType(wsContentType);
@@ -222,7 +222,7 @@ void CXFA_WidgetAcc::ResetData() {
           if (!pItems)
             continue;
 
-          CFX_WideString itemText;
+          WideString itemText;
           if (pItems->CountChildren(XFA_Element::Unknown) > 1)
             itemText = pItems->GetChild(1, XFA_Element::Unknown)->GetContent();
 
@@ -244,15 +244,15 @@ void CXFA_WidgetAcc::ResetData() {
   }
 }
 
-void CXFA_WidgetAcc::SetImageEdit(const CFX_WideString& wsContentType,
-                                  const CFX_WideString& wsHref,
-                                  const CFX_WideString& wsData) {
+void CXFA_WidgetAcc::SetImageEdit(const WideString& wsContentType,
+                                  const WideString& wsHref,
+                                  const WideString& wsData) {
   CXFA_Image image = GetFormValue().GetImage();
   if (image) {
-    image.SetContentType(CFX_WideString(wsContentType));
+    image.SetContentType(WideString(wsContentType));
     image.SetHref(wsHref);
   }
-  CFX_WideString wsFormatValue(wsData);
+  WideString wsFormatValue(wsData);
   GetFormatDataValue(wsData, wsFormatValue);
   m_pNode->SetContent(wsData, wsFormatValue, true);
   CXFA_Node* pBind = GetDatasets();
@@ -367,8 +367,8 @@ void CXFA_WidgetAcc::ProcessScriptTestValidate(CXFA_Validate validate,
       if (!pAppProvider) {
         return;
       }
-      CFX_WideString wsTitle = pAppProvider->GetAppTitle();
-      CFX_WideString wsScriptMsg;
+      WideString wsTitle = pAppProvider->GetAppTitle();
+      WideString wsScriptMsg;
       validate.GetScriptMessageText(wsScriptMsg);
       int32_t eScriptTest = validate.GetScriptTest();
       if (eScriptTest == XFA_ATTRIBUTEENUM_Warning) {
@@ -397,9 +397,9 @@ void CXFA_WidgetAcc::ProcessScriptTestValidate(CXFA_Validate validate,
 
 int32_t CXFA_WidgetAcc::ProcessFormatTestValidate(CXFA_Validate validate,
                                                   bool bVersionFlag) {
-  CFX_WideString wsRawValue = GetRawValue();
+  WideString wsRawValue = GetRawValue();
   if (!wsRawValue.IsEmpty()) {
-    CFX_WideString wsPicture;
+    WideString wsPicture;
     validate.GetPicture(wsPicture);
     if (wsPicture.IsEmpty())
       return XFA_EVENTERROR_NotExist;
@@ -415,9 +415,9 @@ int32_t CXFA_WidgetAcc::ProcessFormatTestValidate(CXFA_Validate validate,
       if (!pAppProvider)
         return XFA_EVENTERROR_NotExist;
 
-      CFX_WideString wsFormatMsg;
+      WideString wsFormatMsg;
       validate.GetFormatMessageText(wsFormatMsg);
-      CFX_WideString wsTitle = pAppProvider->GetAppTitle();
+      WideString wsTitle = pAppProvider->GetAppTitle();
       int32_t eFormatTest = validate.GetFormatTest();
       if (eFormatTest == XFA_ATTRIBUTEENUM_Error) {
         if (wsFormatMsg.IsEmpty())
@@ -448,7 +448,7 @@ int32_t CXFA_WidgetAcc::ProcessFormatTestValidate(CXFA_Validate validate,
 int32_t CXFA_WidgetAcc::ProcessNullTestValidate(CXFA_Validate validate,
                                                 int32_t iFlags,
                                                 bool bVersionFlag) {
-  CFX_WideString wsValue;
+  WideString wsValue;
   GetValue(wsValue, XFA_VALUEPICTURE_Raw);
   if (!wsValue.IsEmpty())
     return XFA_EVENTERROR_Success;
@@ -456,7 +456,7 @@ int32_t CXFA_WidgetAcc::ProcessNullTestValidate(CXFA_Validate validate,
     return XFA_EVENTERROR_Success;
 
   int32_t eNullTest = validate.GetNullTest();
-  CFX_WideString wsNullMsg;
+  WideString wsNullMsg;
   validate.GetNullMessageText(wsNullMsg);
   if (iFlags & 0x01) {
     int32_t iRet = XFA_EVENTERROR_Success;
@@ -480,8 +480,8 @@ int32_t CXFA_WidgetAcc::ProcessNullTestValidate(CXFA_Validate validate,
   if (!pAppProvider)
     return XFA_EVENTERROR_NotExist;
 
-  CFX_WideString wsCaptionName;
-  CFX_WideString wsTitle = pAppProvider->GetAppTitle();
+  WideString wsCaptionName;
+  WideString wsTitle = pAppProvider->GetAppTitle();
   switch (eNullTest) {
     case XFA_ATTRIBUTEENUM_Error: {
       if (wsNullMsg.IsEmpty()) {
@@ -514,8 +514,8 @@ int32_t CXFA_WidgetAcc::ProcessNullTestValidate(CXFA_Validate validate,
   return XFA_EVENTERROR_Success;
 }
 
-CFX_WideString CXFA_WidgetAcc::GetValidateCaptionName(bool bVersionFlag) {
-  CFX_WideString wsCaptionName;
+WideString CXFA_WidgetAcc::GetValidateCaptionName(bool bVersionFlag) {
+  WideString wsCaptionName;
 
   if (!bVersionFlag) {
     if (CXFA_Caption caption = GetCaption()) {
@@ -531,10 +531,9 @@ CFX_WideString CXFA_WidgetAcc::GetValidateCaptionName(bool bVersionFlag) {
   return wsCaptionName;
 }
 
-CFX_WideString CXFA_WidgetAcc::GetValidateMessage(bool bError,
-                                                  bool bVersionFlag) {
-  CFX_WideString wsCaptionName = GetValidateCaptionName(bVersionFlag);
-  CFX_WideString wsMessage;
+WideString CXFA_WidgetAcc::GetValidateMessage(bool bError, bool bVersionFlag) {
+  WideString wsCaptionName = GetValidateCaptionName(bVersionFlag);
+  WideString wsMessage;
   if (bVersionFlag) {
     wsMessage.Format(L"%s validation failed", wsCaptionName.c_str());
     return wsMessage;
@@ -609,7 +608,7 @@ int32_t CXFA_WidgetAcc::ExecuteScript(CXFA_Script script,
   if (script.GetRunAt() == XFA_ATTRIBUTEENUM_Server)
     return XFA_EVENTERROR_Disabled;
 
-  CFX_WideString wsExpression;
+  WideString wsExpression;
   script.GetExpression(wsExpression);
   if (wsExpression.IsEmpty())
     return XFA_EVENTERROR_NotExist;
@@ -630,8 +629,8 @@ int32_t CXFA_WidgetAcc::ExecuteScript(CXFA_Script script,
   auto pTmpRetValue = pdfium::MakeUnique<CFXJSE_Value>(pContext->GetRuntime());
   ++m_nRecursionDepth;
   bool bRet = pContext->RunScript((XFA_SCRIPTLANGTYPE)eScriptType,
-                                  wsExpression.AsStringC(), pTmpRetValue.get(),
-                                  m_pNode);
+                                  wsExpression.AsStringView(),
+                                  pTmpRetValue.get(), m_pNode);
   --m_nRecursionDepth;
   int32_t iRet = XFA_EVENTERROR_Error;
   if (bRet) {
@@ -820,7 +819,7 @@ bool CXFA_WidgetAcc::CalculateWidgetAutoSize(CFX_SizeF& size) {
 
 void CXFA_WidgetAcc::CalculateTextContentSize(CFX_SizeF& size) {
   float fFontSize = GetFontSize();
-  CFX_WideString wsText;
+  WideString wsText;
   GetValue(wsText, XFA_VALUEPICTURE_Display);
   if (wsText.IsEmpty()) {
     size.height += fFontSize;
@@ -1218,7 +1217,7 @@ bool CXFA_WidgetAcc::FindSplitPos(int32_t iBlockIndex, float& fCalcHeight) {
       static_cast<CXFA_FieldLayoutData*>(m_pLayoutData.get());
   int32_t iLinesCount = 0;
   float fHeight = m_pLayoutData->m_fWidgetHeight;
-  CFX_WideString wsText;
+  WideString wsText;
   GetValue(wsText, XFA_VALUEPICTURE_Display);
   if (wsText.IsEmpty()) {
     iLinesCount = 1;
@@ -1495,7 +1494,7 @@ CXFA_WidgetLayoutData* CXFA_WidgetAcc::GetWidgetLayoutData() {
 }
 
 CFX_RetainPtr<CFGAS_GEFont> CXFA_WidgetAcc::GetFDEFont() {
-  CFX_WideStringC wsFontName = L"Courier";
+  WideStringView wsFontName = L"Courier";
   uint32_t dwFontStyle = 0;
   if (CXFA_Font font = GetFont(false)) {
     if (font.IsBold())
diff --git a/xfa/fxfa/cxfa_widgetacc.h b/xfa/fxfa/cxfa_widgetacc.h
index 38b17ef63f..54fd36077d 100644
--- a/xfa/fxfa/cxfa_widgetacc.h
+++ b/xfa/fxfa/cxfa_widgetacc.h
@@ -37,13 +37,13 @@ class CXFA_WidgetAcc : public CXFA_WidgetData {
   CXFA_WidgetAcc(CXFA_FFDocView* pDocView, CXFA_Node* pNode);
   ~CXFA_WidgetAcc();
 
-  bool GetName(CFX_WideString& wsName, int32_t iNameType = 0);
+  bool GetName(WideString& wsName, int32_t iNameType = 0);
   bool ProcessValueChanged();
   void ResetData();
 
-  void SetImageEdit(const CFX_WideString& wsContentType,
-                    const CFX_WideString& wsHref,
-                    const CFX_WideString& wsData);
+  void SetImageEdit(const WideString& wsContentType,
+                    const WideString& wsHref,
+                    const WideString& wsData);
 
   CXFA_WidgetAcc* GetExclGroup();
   CXFA_FFDocView* GetDocView();
@@ -92,8 +92,8 @@ class CXFA_WidgetAcc : public CXFA_WidgetData {
   int32_t ProcessNullTestValidate(CXFA_Validate validate,
                                   int32_t iFlags,
                                   bool bVersionFlag);
-  CFX_WideString GetValidateCaptionName(bool bVersionFlag);
-  CFX_WideString GetValidateMessage(bool bError, bool bVersionFlag);
+  WideString GetValidateCaptionName(bool bVersionFlag);
+  WideString GetValidateMessage(bool bError, bool bVersionFlag);
   void CalcCaptionSize(CFX_SizeF& szCap);
   bool CalculateFieldAutoSize(CFX_SizeF& size);
   bool CalculateWidgetAutoSize(CFX_SizeF& size);
diff --git a/xfa/fxfa/fm2js/cxfa_fm2jscontext.cpp b/xfa/fxfa/fm2js/cxfa_fm2jscontext.cpp
index f49d98ab61..6af7bb7445 100644
--- a/xfa/fxfa/fm2js/cxfa_fm2jscontext.cpp
+++ b/xfa/fxfa/fm2js/cxfa_fm2jscontext.cpp
@@ -338,8 +338,8 @@ const uint8_t g_sAltTable_Time[] = {
 static_assert(FX_ArraySize(g_sAltTable_Time) == L'a' - L'A' + 1,
               "Invalid g_sAltTable_Time size.");
 
-void AlternateDateTimeSymbols(CFX_WideString& wsPattern,
-                              const CFX_WideString& wsAltSymbols,
+void AlternateDateTimeSymbols(WideString& wsPattern,
+                              const WideString& wsAltSymbols,
                               const uint8_t* pAltTable) {
   int32_t nLength = wsPattern.GetLength();
   bool bInConstRange = false;
@@ -368,9 +368,8 @@ void AlternateDateTimeSymbols(CFX_WideString& wsPattern,
   }
 }
 
-bool PatternStringType(const CFX_ByteStringC& szPattern,
-                       uint32_t& patternType) {
-  CFX_WideString wsPattern = CFX_WideString::FromUTF8(szPattern);
+bool PatternStringType(const ByteStringView& szPattern, uint32_t& patternType) {
+  WideString wsPattern = WideString::FromUTF8(szPattern);
   if (L"datetime" == wsPattern.Left(8)) {
     patternType = XFA_VT_DATETIME;
     return true;
@@ -474,19 +473,19 @@ bool IsWhitespace(char c) {
 
 IFX_Locale* LocaleFromString(CXFA_Document* pDoc,
                              CXFA_LocaleMgr* pMgr,
-                             const CFX_ByteStringC& szLocale) {
+                             const ByteStringView& szLocale) {
   if (!szLocale.IsEmpty())
-    return pMgr->GetLocaleByName(CFX_WideString::FromUTF8(szLocale));
+    return pMgr->GetLocaleByName(WideString::FromUTF8(szLocale));
 
   CXFA_Node* pThisNode = ToNode(pDoc->GetScriptContext()->GetThisObject());
   ASSERT(pThisNode);
   return CXFA_WidgetData(pThisNode).GetLocal();
 }
 
-CFX_WideString FormatFromString(IFX_Locale* pLocale,
-                                const CFX_ByteStringC& szFormat) {
+WideString FormatFromString(IFX_Locale* pLocale,
+                            const ByteStringView& szFormat) {
   if (!szFormat.IsEmpty())
-    return CFX_WideString::FromUTF8(szFormat);
+    return WideString::FromUTF8(szFormat);
 
   return pLocale->GetDatePattern(FX_LOCALEDATETIMESUBCATEGORY_Default);
 }
@@ -514,12 +513,12 @@ bool IsPartOfNumberW(wchar_t ch) {
   return std::iswdigit(ch) || ch == L'-' || ch == L'.';
 }
 
-CFX_ByteString GUIDString(bool bSeparator) {
+ByteString GUIDString(bool bSeparator) {
   uint8_t data[16];
   FX_Random_GenerateMT(reinterpret_cast<uint32_t*>(data), 4);
   data[6] = (data[6] & 0x0F) | 0x40;
 
-  CFX_ByteString bsStr;
+  ByteString bsStr;
   char* pBuf = bsStr.GetBuffer(40);
   for (int32_t i = 0; i < 16; ++i, pBuf += 2) {
     if (bSeparator && (i == 4 || i == 6 || i == 8 || i == 10))
@@ -535,7 +534,7 @@ CFX_ByteString GUIDString(bool bSeparator) {
 
 // static
 void CXFA_FM2JSContext::Abs(CFXJSE_Value* pThis,
-                            const CFX_ByteStringC& szFuncName,
+                            const ByteStringView& szFuncName,
                             CFXJSE_Arguments& args) {
   if (args.GetLength() != 1) {
     ToJSContext(pThis, nullptr)->ThrowParamCountMismatchException(L"Abs");
@@ -557,7 +556,7 @@ void CXFA_FM2JSContext::Abs(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::Avg(CFXJSE_Value* pThis,
-                            const CFX_ByteStringC& szFuncName,
+                            const ByteStringView& szFuncName,
                             CFXJSE_Arguments& args) {
   int32_t argc = args.GetLength();
   if (argc < 1) {
@@ -604,7 +603,7 @@ void CXFA_FM2JSContext::Avg(CFXJSE_Value* pThis,
           argValue->GetObjectPropertyByIdx(j, jsObjectValue.get());
           auto newPropertyValue = pdfium::MakeUnique<CFXJSE_Value>(pIsolate);
           jsObjectValue->GetObjectProperty(
-              propertyValue->ToString().AsStringC(), newPropertyValue.get());
+              propertyValue->ToString().AsStringView(), newPropertyValue.get());
           if (newPropertyValue->IsNull())
             continue;
 
@@ -624,7 +623,7 @@ void CXFA_FM2JSContext::Avg(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::Ceil(CFXJSE_Value* pThis,
-                             const CFX_ByteStringC& szFuncName,
+                             const ByteStringView& szFuncName,
                              CFXJSE_Arguments& args) {
   if (args.GetLength() != 1) {
     ToJSContext(pThis, nullptr)->ThrowParamCountMismatchException(L"Ceil");
@@ -642,7 +641,7 @@ void CXFA_FM2JSContext::Ceil(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::Count(CFXJSE_Value* pThis,
-                              const CFX_ByteStringC& szFuncName,
+                              const ByteStringView& szFuncName,
                               CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   v8::Isolate* pIsolate = pContext->GetScriptRuntime();
@@ -678,7 +677,7 @@ void CXFA_FM2JSContext::Count(CFXJSE_Value* pThis,
         for (int32_t j = 2; j < iLength; j++) {
           argValue->GetObjectPropertyByIdx(j, jsObjectValue.get());
           jsObjectValue->GetObjectProperty(
-              propertyValue->ToString().AsStringC(), newPropertyValue.get());
+              propertyValue->ToString().AsStringView(), newPropertyValue.get());
           iCount += newPropertyValue->IsNull() ? 0 : 1;
         }
       }
@@ -696,7 +695,7 @@ void CXFA_FM2JSContext::Count(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::Floor(CFXJSE_Value* pThis,
-                              const CFX_ByteStringC& szFuncName,
+                              const ByteStringView& szFuncName,
                               CFXJSE_Arguments& args) {
   if (args.GetLength() != 1) {
     ToJSContext(pThis, nullptr)->ThrowParamCountMismatchException(L"Floor");
@@ -714,7 +713,7 @@ void CXFA_FM2JSContext::Floor(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::Max(CFXJSE_Value* pThis,
-                            const CFX_ByteStringC& szFuncName,
+                            const ByteStringView& szFuncName,
                             CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   v8::Isolate* pIsolate = pContext->GetScriptRuntime();
@@ -754,7 +753,7 @@ void CXFA_FM2JSContext::Max(CFXJSE_Value* pThis,
         for (int32_t j = 2; j < iLength; j++) {
           argValue->GetObjectPropertyByIdx(j, jsObjectValue.get());
           jsObjectValue->GetObjectProperty(
-              propertyValue->ToString().AsStringC(), newPropertyValue.get());
+              propertyValue->ToString().AsStringView(), newPropertyValue.get());
           if (newPropertyValue->IsNull())
             continue;
 
@@ -788,7 +787,7 @@ void CXFA_FM2JSContext::Max(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::Min(CFXJSE_Value* pThis,
-                            const CFX_ByteStringC& szFuncName,
+                            const ByteStringView& szFuncName,
                             CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   v8::Isolate* pIsolate = pContext->GetScriptRuntime();
@@ -828,7 +827,7 @@ void CXFA_FM2JSContext::Min(CFXJSE_Value* pThis,
         for (int32_t j = 2; j < iLength; j++) {
           argValue->GetObjectPropertyByIdx(j, jsObjectValue.get());
           jsObjectValue->GetObjectProperty(
-              propertyValue->ToString().AsStringC(), newPropertyValue.get());
+              propertyValue->ToString().AsStringView(), newPropertyValue.get());
           if (newPropertyValue->IsNull())
             continue;
 
@@ -862,7 +861,7 @@ void CXFA_FM2JSContext::Min(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::Mod(CFXJSE_Value* pThis,
-                            const CFX_ByteStringC& szFuncName,
+                            const ByteStringView& szFuncName,
                             CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   if (args.GetLength() != 2) {
@@ -897,7 +896,7 @@ void CXFA_FM2JSContext::Mod(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::Round(CFXJSE_Value* pThis,
-                              const CFX_ByteStringC& szFuncName,
+                              const ByteStringView& szFuncName,
                               CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   int32_t argc = args.GetLength();
@@ -943,7 +942,7 @@ void CXFA_FM2JSContext::Round(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::Sum(CFXJSE_Value* pThis,
-                            const CFX_ByteStringC& szFuncName,
+                            const ByteStringView& szFuncName,
                             CFXJSE_Arguments& args) {
   int32_t argc = args.GetLength();
   if (argc == 0) {
@@ -987,7 +986,7 @@ void CXFA_FM2JSContext::Sum(CFXJSE_Value* pThis,
         for (int32_t j = 2; j < iLength; j++) {
           argValue->GetObjectPropertyByIdx(j, jsObjectValue.get());
           jsObjectValue->GetObjectProperty(
-              propertyValue->ToString().AsStringC(), newPropertyValue.get());
+              propertyValue->ToString().AsStringView(), newPropertyValue.get());
           if (newPropertyValue->IsNull())
             continue;
 
@@ -1018,7 +1017,7 @@ void CXFA_FM2JSContext::Sum(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::Date(CFXJSE_Value* pThis,
-                             const CFX_ByteStringC& szFuncName,
+                             const ByteStringView& szFuncName,
                              CFXJSE_Arguments& args) {
   if (args.GetLength() != 0) {
     ToJSContext(pThis, nullptr)->ThrowParamCountMismatchException(L"Date");
@@ -1029,20 +1028,21 @@ void CXFA_FM2JSContext::Date(CFXJSE_Value* pThis,
   time(&currentTime);
   struct tm* pTmStruct = gmtime(&currentTime);
 
-  CFX_ByteString bufferYear;
-  CFX_ByteString bufferMon;
-  CFX_ByteString bufferDay;
+  ByteString bufferYear;
+  ByteString bufferMon;
+  ByteString bufferDay;
   bufferYear.Format("%d", pTmStruct->tm_year + 1900);
   bufferMon.Format("%02d", pTmStruct->tm_mon + 1);
   bufferDay.Format("%02d", pTmStruct->tm_mday);
 
-  CFX_ByteString bufferCurrent = bufferYear + bufferMon + bufferDay;
-  args.GetReturnValue()->SetInteger(DateString2Num(bufferCurrent.AsStringC()));
+  ByteString bufferCurrent = bufferYear + bufferMon + bufferDay;
+  args.GetReturnValue()->SetInteger(
+      DateString2Num(bufferCurrent.AsStringView()));
 }
 
 // static
 void CXFA_FM2JSContext::Date2Num(CFXJSE_Value* pThis,
-                                 const CFX_ByteStringC& szFuncName,
+                                 const ByteStringView& szFuncName,
                                  CFXJSE_Arguments& args) {
   int32_t argc = args.GetLength();
   if (argc < 1 || argc > 3) {
@@ -1056,8 +1056,8 @@ void CXFA_FM2JSContext::Date2Num(CFXJSE_Value* pThis,
     return;
   }
 
-  CFX_ByteString dateString = ValueToUTF8String(dateValue.get());
-  CFX_ByteString formatString;
+  ByteString dateString = ValueToUTF8String(dateValue.get());
+  ByteString formatString;
   if (argc > 1) {
     std::unique_ptr<CFXJSE_Value> formatValue = GetSimpleValue(pThis, args, 1);
     if (ValueIsNull(pThis, formatValue.get())) {
@@ -1067,7 +1067,7 @@ void CXFA_FM2JSContext::Date2Num(CFXJSE_Value* pThis,
     formatString = ValueToUTF8String(formatValue.get());
   }
 
-  CFX_ByteString localString;
+  ByteString localString;
   if (argc > 2) {
     std::unique_ptr<CFXJSE_Value> localValue = GetSimpleValue(pThis, args, 2);
     if (ValueIsNull(pThis, localValue.get())) {
@@ -1077,16 +1077,16 @@ void CXFA_FM2JSContext::Date2Num(CFXJSE_Value* pThis,
     localString = ValueToUTF8String(localValue.get());
   }
 
-  CFX_ByteString szIsoDateString =
-      Local2IsoDate(pThis, dateString.AsStringC(), formatString.AsStringC(),
-                    localString.AsStringC());
+  ByteString szIsoDateString =
+      Local2IsoDate(pThis, dateString.AsStringView(),
+                    formatString.AsStringView(), localString.AsStringView());
   args.GetReturnValue()->SetInteger(
-      DateString2Num(szIsoDateString.AsStringC()));
+      DateString2Num(szIsoDateString.AsStringView()));
 }
 
 // static
 void CXFA_FM2JSContext::DateFmt(CFXJSE_Value* pThis,
-                                const CFX_ByteStringC& szFuncName,
+                                const ByteStringView& szFuncName,
                                 CFXJSE_Arguments& args) {
   int32_t argc = args.GetLength();
   if (argc > 2) {
@@ -1107,7 +1107,7 @@ void CXFA_FM2JSContext::DateFmt(CFXJSE_Value* pThis,
       iStyle = 0;
   }
 
-  CFX_ByteString szLocal;
+  ByteString szLocal;
   if (argc > 1) {
     std::unique_ptr<CFXJSE_Value> argLocal = GetSimpleValue(pThis, args, 1);
     if (argLocal->IsNull()) {
@@ -1117,14 +1117,14 @@ void CXFA_FM2JSContext::DateFmt(CFXJSE_Value* pThis,
     szLocal = ValueToUTF8String(argLocal.get());
   }
 
-  CFX_ByteString formatStr =
-      GetStandardDateFormat(pThis, iStyle, szLocal.AsStringC());
-  args.GetReturnValue()->SetString(formatStr.AsStringC());
+  ByteString formatStr =
+      GetStandardDateFormat(pThis, iStyle, szLocal.AsStringView());
+  args.GetReturnValue()->SetString(formatStr.AsStringView());
 }
 
 // static
 void CXFA_FM2JSContext::IsoDate2Num(CFXJSE_Value* pThis,
-                                    const CFX_ByteStringC& szFuncName,
+                                    const ByteStringView& szFuncName,
                                     CFXJSE_Arguments& args) {
   if (args.GetLength() != 1) {
     ToJSContext(pThis, nullptr)
@@ -1136,13 +1136,13 @@ void CXFA_FM2JSContext::IsoDate2Num(CFXJSE_Value* pThis,
     args.GetReturnValue()->SetNull();
     return;
   }
-  CFX_ByteString szArgString = ValueToUTF8String(argOne.get());
-  args.GetReturnValue()->SetInteger(DateString2Num(szArgString.AsStringC()));
+  ByteString szArgString = ValueToUTF8String(argOne.get());
+  args.GetReturnValue()->SetInteger(DateString2Num(szArgString.AsStringView()));
 }
 
 // static
 void CXFA_FM2JSContext::IsoTime2Num(CFXJSE_Value* pThis,
-                                    const CFX_ByteStringC& szFuncName,
+                                    const ByteStringView& szFuncName,
                                     CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   if (args.GetLength() != 1) {
@@ -1158,7 +1158,7 @@ void CXFA_FM2JSContext::IsoTime2Num(CFXJSE_Value* pThis,
 
   CXFA_Document* pDoc = pContext->GetDocument();
   CXFA_LocaleMgr* pMgr = pDoc->GetLocalMgr();
-  CFX_ByteString szArgString = ValueToUTF8String(argOne.get());
+  ByteString szArgString = ValueToUTF8String(argOne.get());
   auto pos = szArgString.Find('T', 0);
   if (!pos.has_value() || pos.value() == szArgString.GetLength() - 1) {
     args.GetReturnValue()->SetInteger(0);
@@ -1167,7 +1167,7 @@ void CXFA_FM2JSContext::IsoTime2Num(CFXJSE_Value* pThis,
   szArgString = szArgString.Right(szArgString.GetLength() - (pos.value() + 1));
 
   CXFA_LocaleValue timeValue(
-      XFA_VT_TIME, CFX_WideString::FromUTF8(szArgString.AsStringC()), pMgr);
+      XFA_VT_TIME, WideString::FromUTF8(szArgString.AsStringView()), pMgr);
   if (!timeValue.IsValid()) {
     args.GetReturnValue()->SetInteger(0);
     return;
@@ -1196,7 +1196,7 @@ void CXFA_FM2JSContext::IsoTime2Num(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::LocalDateFmt(CFXJSE_Value* pThis,
-                                     const CFX_ByteStringC& szFuncName,
+                                     const ByteStringView& szFuncName,
                                      CFXJSE_Arguments& args) {
   int32_t argc = args.GetLength();
   if (argc > 2) {
@@ -1217,7 +1217,7 @@ void CXFA_FM2JSContext::LocalDateFmt(CFXJSE_Value* pThis,
       iStyle = 0;
   }
 
-  CFX_ByteString szLocal;
+  ByteString szLocal;
   if (argc > 1) {
     std::unique_ptr<CFXJSE_Value> argLocal = GetSimpleValue(pThis, args, 1);
     if (argLocal->IsNull()) {
@@ -1227,14 +1227,14 @@ void CXFA_FM2JSContext::LocalDateFmt(CFXJSE_Value* pThis,
     szLocal = ValueToUTF8String(argLocal.get());
   }
 
-  CFX_ByteString formatStr =
-      GetLocalDateFormat(pThis, iStyle, szLocal.AsStringC(), false);
-  args.GetReturnValue()->SetString(formatStr.AsStringC());
+  ByteString formatStr =
+      GetLocalDateFormat(pThis, iStyle, szLocal.AsStringView(), false);
+  args.GetReturnValue()->SetString(formatStr.AsStringView());
 }
 
 // static
 void CXFA_FM2JSContext::LocalTimeFmt(CFXJSE_Value* pThis,
-                                     const CFX_ByteStringC& szFuncName,
+                                     const ByteStringView& szFuncName,
                                      CFXJSE_Arguments& args) {
   int32_t argc = args.GetLength();
   if (argc > 2) {
@@ -1255,7 +1255,7 @@ void CXFA_FM2JSContext::LocalTimeFmt(CFXJSE_Value* pThis,
       iStyle = 0;
   }
 
-  CFX_ByteString szLocal;
+  ByteString szLocal;
   if (argc > 1) {
     std::unique_ptr<CFXJSE_Value> argLocal = GetSimpleValue(pThis, args, 1);
     if (argLocal->IsNull()) {
@@ -1265,14 +1265,14 @@ void CXFA_FM2JSContext::LocalTimeFmt(CFXJSE_Value* pThis,
     szLocal = ValueToUTF8String(argLocal.get());
   }
 
-  CFX_ByteString formatStr =
-      GetLocalTimeFormat(pThis, iStyle, szLocal.AsStringC(), false);
-  args.GetReturnValue()->SetString(formatStr.AsStringC());
+  ByteString formatStr =
+      GetLocalTimeFormat(pThis, iStyle, szLocal.AsStringView(), false);
+  args.GetReturnValue()->SetString(formatStr.AsStringView());
 }
 
 // static
 void CXFA_FM2JSContext::Num2Date(CFXJSE_Value* pThis,
-                                 const CFX_ByteStringC& szFuncName,
+                                 const ByteStringView& szFuncName,
                                  CFXJSE_Arguments& args) {
   int32_t argc = args.GetLength();
   if (argc < 1 || argc > 3) {
@@ -1291,7 +1291,7 @@ void CXFA_FM2JSContext::Num2Date(CFXJSE_Value* pThis,
     return;
   }
 
-  CFX_ByteString formatString;
+  ByteString formatString;
   if (argc > 1) {
     std::unique_ptr<CFXJSE_Value> formatValue = GetSimpleValue(pThis, args, 1);
     if (ValueIsNull(pThis, formatValue.get())) {
@@ -1301,7 +1301,7 @@ void CXFA_FM2JSContext::Num2Date(CFXJSE_Value* pThis,
     formatString = ValueToUTF8String(formatValue.get());
   }
 
-  CFX_ByteString localString;
+  ByteString localString;
   if (argc > 2) {
     std::unique_ptr<CFXJSE_Value> localValue = GetSimpleValue(pThis, args, 2);
     if (ValueIsNull(pThis, localValue.get())) {
@@ -1403,17 +1403,17 @@ void CXFA_FM2JSContext::Num2Date(CFXJSE_Value* pThis,
     }
   }
 
-  CFX_ByteString szIsoDateString;
+  ByteString szIsoDateString;
   szIsoDateString.Format("%d%02d%02d", iYear + i, iMonth, iDay);
-  CFX_ByteString szLocalDateString =
-      IsoDate2Local(pThis, szIsoDateString.AsStringC(),
-                    formatString.AsStringC(), localString.AsStringC());
-  args.GetReturnValue()->SetString(szLocalDateString.AsStringC());
+  ByteString szLocalDateString =
+      IsoDate2Local(pThis, szIsoDateString.AsStringView(),
+                    formatString.AsStringView(), localString.AsStringView());
+  args.GetReturnValue()->SetString(szLocalDateString.AsStringView());
 }
 
 // static
 void CXFA_FM2JSContext::Num2GMTime(CFXJSE_Value* pThis,
-                                   const CFX_ByteStringC& szFuncName,
+                                   const ByteStringView& szFuncName,
                                    CFXJSE_Arguments& args) {
   int32_t argc = args.GetLength();
   if (argc < 1 || argc > 3) {
@@ -1433,7 +1433,7 @@ void CXFA_FM2JSContext::Num2GMTime(CFXJSE_Value* pThis,
     return;
   }
 
-  CFX_ByteString formatString;
+  ByteString formatString;
   if (argc > 1) {
     std::unique_ptr<CFXJSE_Value> formatValue = GetSimpleValue(pThis, args, 1);
     if (formatValue->IsNull()) {
@@ -1443,7 +1443,7 @@ void CXFA_FM2JSContext::Num2GMTime(CFXJSE_Value* pThis,
     formatString = ValueToUTF8String(formatValue.get());
   }
 
-  CFX_ByteString localString;
+  ByteString localString;
   if (argc > 2) {
     std::unique_ptr<CFXJSE_Value> localValue = GetSimpleValue(pThis, args, 2);
     if (localValue->IsNull()) {
@@ -1453,14 +1453,15 @@ void CXFA_FM2JSContext::Num2GMTime(CFXJSE_Value* pThis,
     localString = ValueToUTF8String(localValue.get());
   }
 
-  CFX_ByteString szGMTTimeString = Num2AllTime(
-      pThis, iTime, formatString.AsStringC(), localString.AsStringC(), true);
-  args.GetReturnValue()->SetString(szGMTTimeString.AsStringC());
+  ByteString szGMTTimeString =
+      Num2AllTime(pThis, iTime, formatString.AsStringView(),
+                  localString.AsStringView(), true);
+  args.GetReturnValue()->SetString(szGMTTimeString.AsStringView());
 }
 
 // static
 void CXFA_FM2JSContext::Num2Time(CFXJSE_Value* pThis,
-                                 const CFX_ByteStringC& szFuncName,
+                                 const ByteStringView& szFuncName,
                                  CFXJSE_Arguments& args) {
   int32_t argc = args.GetLength();
   if (argc < 1 || argc > 3) {
@@ -1479,7 +1480,7 @@ void CXFA_FM2JSContext::Num2Time(CFXJSE_Value* pThis,
     return;
   }
 
-  CFX_ByteString formatString;
+  ByteString formatString;
   if (argc > 1) {
     std::unique_ptr<CFXJSE_Value> formatValue = GetSimpleValue(pThis, args, 1);
     if (formatValue->IsNull()) {
@@ -1489,7 +1490,7 @@ void CXFA_FM2JSContext::Num2Time(CFXJSE_Value* pThis,
     formatString = ValueToUTF8String(formatValue.get());
   }
 
-  CFX_ByteString localString;
+  ByteString localString;
   if (argc > 2) {
     std::unique_ptr<CFXJSE_Value> localValue = GetSimpleValue(pThis, args, 2);
     if (localValue->IsNull()) {
@@ -1499,15 +1500,15 @@ void CXFA_FM2JSContext::Num2Time(CFXJSE_Value* pThis,
     localString = ValueToUTF8String(localValue.get());
   }
 
-  CFX_ByteString szLocalTimeString =
-      Num2AllTime(pThis, static_cast<int32_t>(fTime), formatString.AsStringC(),
-                  localString.AsStringC(), false);
-  args.GetReturnValue()->SetString(szLocalTimeString.AsStringC());
+  ByteString szLocalTimeString = Num2AllTime(pThis, static_cast<int32_t>(fTime),
+                                             formatString.AsStringView(),
+                                             localString.AsStringView(), false);
+  args.GetReturnValue()->SetString(szLocalTimeString.AsStringView());
 }
 
 // static
 void CXFA_FM2JSContext::Time(CFXJSE_Value* pThis,
-                             const CFX_ByteStringC& szFuncName,
+                             const ByteStringView& szFuncName,
                              CFXJSE_Arguments& args) {
   if (args.GetLength() != 0) {
     ToJSContext(pThis, nullptr)->ThrowParamCountMismatchException(L"Time");
@@ -1524,7 +1525,7 @@ void CXFA_FM2JSContext::Time(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::Time2Num(CFXJSE_Value* pThis,
-                                 const CFX_ByteStringC& szFuncName,
+                                 const ByteStringView& szFuncName,
                                  CFXJSE_Arguments& args) {
   int32_t argc = args.GetLength();
   if (argc < 1 || argc > 3) {
@@ -1532,7 +1533,7 @@ void CXFA_FM2JSContext::Time2Num(CFXJSE_Value* pThis,
     return;
   }
 
-  CFX_ByteString timeString;
+  ByteString timeString;
   std::unique_ptr<CFXJSE_Value> timeValue = GetSimpleValue(pThis, args, 0);
   if (ValueIsNull(pThis, timeValue.get())) {
     args.GetReturnValue()->SetNull();
@@ -1540,7 +1541,7 @@ void CXFA_FM2JSContext::Time2Num(CFXJSE_Value* pThis,
   }
   timeString = ValueToUTF8String(timeValue.get());
 
-  CFX_ByteString formatString;
+  ByteString formatString;
   if (argc > 1) {
     std::unique_ptr<CFXJSE_Value> formatValue = GetSimpleValue(pThis, args, 1);
     if (ValueIsNull(pThis, formatValue.get())) {
@@ -1550,7 +1551,7 @@ void CXFA_FM2JSContext::Time2Num(CFXJSE_Value* pThis,
     formatString = ValueToUTF8String(formatValue.get());
   }
 
-  CFX_ByteString localString;
+  ByteString localString;
   if (argc > 2) {
     std::unique_ptr<CFXJSE_Value> localValue = GetSimpleValue(pThis, args, 2);
     if (ValueIsNull(pThis, localValue.get())) {
@@ -1569,19 +1570,19 @@ void CXFA_FM2JSContext::Time2Num(CFXJSE_Value* pThis,
     CXFA_WidgetData widgetData(pThisNode);
     pLocale = widgetData.GetLocal();
   } else {
-    pLocale = pMgr->GetLocaleByName(
-        CFX_WideString::FromUTF8(localString.AsStringC()));
+    pLocale =
+        pMgr->GetLocaleByName(WideString::FromUTF8(localString.AsStringView()));
   }
 
-  CFX_WideString wsFormat;
+  WideString wsFormat;
   if (formatString.IsEmpty())
     wsFormat = pLocale->GetTimePattern(FX_LOCALEDATETIMESUBCATEGORY_Default);
   else
-    wsFormat = CFX_WideString::FromUTF8(formatString.AsStringC());
+    wsFormat = WideString::FromUTF8(formatString.AsStringView());
 
   wsFormat = L"time{" + wsFormat + L"}";
   CXFA_LocaleValue localeValue(XFA_VT_TIME,
-                               CFX_WideString::FromUTF8(timeString.AsStringC()),
+                               WideString::FromUTF8(timeString.AsStringView()),
                                wsFormat, pLocale, pMgr);
   if (!localeValue.IsValid()) {
     args.GetReturnValue()->SetInteger(0);
@@ -1610,7 +1611,7 @@ void CXFA_FM2JSContext::Time2Num(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::TimeFmt(CFXJSE_Value* pThis,
-                                const CFX_ByteStringC& szFuncName,
+                                const ByteStringView& szFuncName,
                                 CFXJSE_Arguments& args) {
   int32_t argc = args.GetLength();
   if (argc > 2) {
@@ -1630,7 +1631,7 @@ void CXFA_FM2JSContext::TimeFmt(CFXJSE_Value* pThis,
       iStyle = 0;
   }
 
-  CFX_ByteString szLocal;
+  ByteString szLocal;
   if (argc > 1) {
     std::unique_ptr<CFXJSE_Value> argLocal = GetSimpleValue(pThis, args, 1);
     if (argLocal->IsNull()) {
@@ -1640,9 +1641,9 @@ void CXFA_FM2JSContext::TimeFmt(CFXJSE_Value* pThis,
     szLocal = ValueToUTF8String(argLocal.get());
   }
 
-  CFX_ByteString formatStr =
-      GetStandardTimeFormat(pThis, iStyle, szLocal.AsStringC());
-  args.GetReturnValue()->SetString(formatStr.AsStringC());
+  ByteString formatStr =
+      GetStandardTimeFormat(pThis, iStyle, szLocal.AsStringView());
+  args.GetReturnValue()->SetString(formatStr.AsStringView());
 }
 
 // static
@@ -1913,80 +1914,75 @@ bool CXFA_FM2JSContext::IsIsoDateTimeFormat(const char* pData,
 }
 
 // static
-CFX_ByteString CXFA_FM2JSContext::Local2IsoDate(
-    CFXJSE_Value* pThis,
-    const CFX_ByteStringC& szDate,
-    const CFX_ByteStringC& szFormat,
-    const CFX_ByteStringC& szLocale) {
+ByteString CXFA_FM2JSContext::Local2IsoDate(CFXJSE_Value* pThis,
+                                            const ByteStringView& szDate,
+                                            const ByteStringView& szFormat,
+                                            const ByteStringView& szLocale) {
   CXFA_Document* pDoc = ToJSContext(pThis, nullptr)->GetDocument();
   if (!pDoc)
-    return CFX_ByteString();
+    return ByteString();
 
   CXFA_LocaleMgr* pMgr = pDoc->GetLocalMgr();
   IFX_Locale* pLocale = LocaleFromString(pDoc, pMgr, szLocale);
   if (!pLocale)
-    return CFX_ByteString();
+    return ByteString();
 
-  CFX_WideString wsFormat = FormatFromString(pLocale, szFormat);
-  CFX_DateTime dt =
-      CXFA_LocaleValue(XFA_VT_DATE, CFX_WideString::FromUTF8(szDate), wsFormat,
-                       pLocale, pMgr)
-          .GetDate();
+  WideString wsFormat = FormatFromString(pLocale, szFormat);
+  CFX_DateTime dt = CXFA_LocaleValue(XFA_VT_DATE, WideString::FromUTF8(szDate),
+                                     wsFormat, pLocale, pMgr)
+                        .GetDate();
 
-  CFX_ByteString strIsoDate;
+  ByteString strIsoDate;
   strIsoDate.Format("%4d-%02d-%02d", dt.GetYear(), dt.GetMonth(), dt.GetDay());
   return strIsoDate;
 }
 
 // static
-CFX_ByteString CXFA_FM2JSContext::IsoDate2Local(
-    CFXJSE_Value* pThis,
-    const CFX_ByteStringC& szDate,
-    const CFX_ByteStringC& szFormat,
-    const CFX_ByteStringC& szLocale) {
+ByteString CXFA_FM2JSContext::IsoDate2Local(CFXJSE_Value* pThis,
+                                            const ByteStringView& szDate,
+                                            const ByteStringView& szFormat,
+                                            const ByteStringView& szLocale) {
   CXFA_Document* pDoc = ToJSContext(pThis, nullptr)->GetDocument();
   if (!pDoc)
-    return CFX_ByteString();
+    return ByteString();
 
   CXFA_LocaleMgr* pMgr = pDoc->GetLocalMgr();
   IFX_Locale* pLocale = LocaleFromString(pDoc, pMgr, szLocale);
   if (!pLocale)
-    return CFX_ByteString();
+    return ByteString();
 
-  CFX_WideString wsFormat = FormatFromString(pLocale, szFormat);
-  CFX_WideString wsRet;
-  CXFA_LocaleValue(XFA_VT_DATE, CFX_WideString::FromUTF8(szDate), pMgr)
+  WideString wsFormat = FormatFromString(pLocale, szFormat);
+  WideString wsRet;
+  CXFA_LocaleValue(XFA_VT_DATE, WideString::FromUTF8(szDate), pMgr)
       .FormatPatterns(wsRet, wsFormat, pLocale, XFA_VALUEPICTURE_Display);
   return wsRet.UTF8Encode();
 }
 
 // static
-CFX_ByteString CXFA_FM2JSContext::IsoTime2Local(
-    CFXJSE_Value* pThis,
-    const CFX_ByteStringC& szTime,
-    const CFX_ByteStringC& szFormat,
-    const CFX_ByteStringC& szLocale) {
+ByteString CXFA_FM2JSContext::IsoTime2Local(CFXJSE_Value* pThis,
+                                            const ByteStringView& szTime,
+                                            const ByteStringView& szFormat,
+                                            const ByteStringView& szLocale) {
   CXFA_Document* pDoc = ToJSContext(pThis, nullptr)->GetDocument();
   if (!pDoc)
-    return CFX_ByteString();
+    return ByteString();
 
   CXFA_LocaleMgr* pMgr = pDoc->GetLocalMgr();
   IFX_Locale* pLocale = LocaleFromString(pDoc, pMgr, szLocale);
   if (!pLocale)
-    return CFX_ByteString();
+    return ByteString();
 
-  CFX_WideString wsFormat = {
-      L"time{", FormatFromString(pLocale, szFormat).AsStringC(), L"}"};
-  CXFA_LocaleValue widgetValue(XFA_VT_TIME, CFX_WideString::FromUTF8(szTime),
-                               pMgr);
-  CFX_WideString wsRet;
+  WideString wsFormat = {
+      L"time{", FormatFromString(pLocale, szFormat).AsStringView(), L"}"};
+  CXFA_LocaleValue widgetValue(XFA_VT_TIME, WideString::FromUTF8(szTime), pMgr);
+  WideString wsRet;
   widgetValue.FormatPatterns(wsRet, wsFormat, pLocale,
                              XFA_VALUEPICTURE_Display);
   return wsRet.UTF8Encode();
 }
 
 // static
-int32_t CXFA_FM2JSContext::DateString2Num(const CFX_ByteStringC& szDateString) {
+int32_t CXFA_FM2JSContext::DateString2Num(const ByteStringView& szDateString) {
   int32_t iLength = szDateString.GetLength();
   int32_t iYear = 0;
   int32_t iMonth = 0;
@@ -2043,21 +2039,20 @@ int32_t CXFA_FM2JSContext::DateString2Num(const CFX_ByteStringC& szDateString) {
 }
 
 // static
-CFX_ByteString CXFA_FM2JSContext::GetLocalDateFormat(
-    CFXJSE_Value* pThis,
-    int32_t iStyle,
-    const CFX_ByteStringC& szLocale,
-    bool bStandard) {
+ByteString CXFA_FM2JSContext::GetLocalDateFormat(CFXJSE_Value* pThis,
+                                                 int32_t iStyle,
+                                                 const ByteStringView& szLocale,
+                                                 bool bStandard) {
   CXFA_Document* pDoc = ToJSContext(pThis, nullptr)->GetDocument();
   if (!pDoc)
-    return CFX_ByteString();
+    return ByteString();
 
   CXFA_LocaleMgr* pMgr = pDoc->GetLocalMgr();
   IFX_Locale* pLocale = LocaleFromString(pDoc, pMgr, szLocale);
   if (!pLocale)
-    return CFX_ByteString();
+    return ByteString();
 
-  CFX_WideString strRet = pLocale->GetDatePattern(SubCategoryFromInt(iStyle));
+  WideString strRet = pLocale->GetDatePattern(SubCategoryFromInt(iStyle));
   if (!bStandard) {
     AlternateDateTimeSymbols(strRet, pLocale->GetDateTimeSymbols(),
                              g_sAltTable_Date);
@@ -2066,21 +2061,20 @@ CFX_ByteString CXFA_FM2JSContext::GetLocalDateFormat(
 }
 
 // static
-CFX_ByteString CXFA_FM2JSContext::GetLocalTimeFormat(
-    CFXJSE_Value* pThis,
-    int32_t iStyle,
-    const CFX_ByteStringC& szLocale,
-    bool bStandard) {
+ByteString CXFA_FM2JSContext::GetLocalTimeFormat(CFXJSE_Value* pThis,
+                                                 int32_t iStyle,
+                                                 const ByteStringView& szLocale,
+                                                 bool bStandard) {
   CXFA_Document* pDoc = ToJSContext(pThis, nullptr)->GetDocument();
   if (!pDoc)
-    return CFX_ByteString();
+    return ByteString();
 
   CXFA_LocaleMgr* pMgr = pDoc->GetLocalMgr();
   IFX_Locale* pLocale = LocaleFromString(pDoc, pMgr, szLocale);
   if (!pLocale)
-    return CFX_ByteString();
+    return ByteString();
 
-  CFX_WideString strRet = pLocale->GetTimePattern(SubCategoryFromInt(iStyle));
+  WideString strRet = pLocale->GetTimePattern(SubCategoryFromInt(iStyle));
   if (!bStandard) {
     AlternateDateTimeSymbols(strRet, pLocale->GetDateTimeSymbols(),
                              g_sAltTable_Time);
@@ -2089,27 +2083,27 @@ CFX_ByteString CXFA_FM2JSContext::GetLocalTimeFormat(
 }
 
 // static
-CFX_ByteString CXFA_FM2JSContext::GetStandardDateFormat(
+ByteString CXFA_FM2JSContext::GetStandardDateFormat(
     CFXJSE_Value* pThis,
     int32_t iStyle,
-    const CFX_ByteStringC& szLocalStr) {
+    const ByteStringView& szLocalStr) {
   return GetLocalDateFormat(pThis, iStyle, szLocalStr, true);
 }
 
 // static
-CFX_ByteString CXFA_FM2JSContext::GetStandardTimeFormat(
+ByteString CXFA_FM2JSContext::GetStandardTimeFormat(
     CFXJSE_Value* pThis,
     int32_t iStyle,
-    const CFX_ByteStringC& szLocalStr) {
+    const ByteStringView& szLocalStr) {
   return GetLocalTimeFormat(pThis, iStyle, szLocalStr, true);
 }
 
 // static
-CFX_ByteString CXFA_FM2JSContext::Num2AllTime(CFXJSE_Value* pThis,
-                                              int32_t iTime,
-                                              const CFX_ByteStringC& szFormat,
-                                              const CFX_ByteStringC& szLocale,
-                                              bool bGM) {
+ByteString CXFA_FM2JSContext::Num2AllTime(CFXJSE_Value* pThis,
+                                          int32_t iTime,
+                                          const ByteStringView& szFormat,
+                                          const ByteStringView& szLocale,
+                                          bool bGM) {
   int32_t iHour = 0;
   int32_t iMin = 0;
   int32_t iSec = 0;
@@ -2127,9 +2121,9 @@ CFX_ByteString CXFA_FM2JSContext::Num2AllTime(CFXJSE_Value* pThis,
     iSec += iZoneSec;
   }
 
-  CFX_ByteString strIsoTime;
+  ByteString strIsoTime;
   strIsoTime.Format("%02d:%02d:%02d", iHour, iMin, iSec);
-  return IsoTime2Local(pThis, strIsoTime.AsStringC(), szFormat, szLocale);
+  return IsoTime2Local(pThis, strIsoTime.AsStringView(), szFormat, szLocale);
 }
 
 // static
@@ -2148,7 +2142,7 @@ void CXFA_FM2JSContext::GetLocalTimeZone(int32_t& iHour,
 
 // static
 void CXFA_FM2JSContext::Apr(CFXJSE_Value* pThis,
-                            const CFX_ByteStringC& szFuncName,
+                            const ByteStringView& szFuncName,
                             CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   if (args.GetLength() != 3) {
@@ -2201,7 +2195,7 @@ void CXFA_FM2JSContext::Apr(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::CTerm(CFXJSE_Value* pThis,
-                              const CFX_ByteStringC& szFuncName,
+                              const ByteStringView& szFuncName,
                               CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   if (args.GetLength() != 3) {
@@ -2232,7 +2226,7 @@ void CXFA_FM2JSContext::CTerm(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::FV(CFXJSE_Value* pThis,
-                           const CFX_ByteStringC& szFuncName,
+                           const ByteStringView& szFuncName,
                            CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   if (args.GetLength() != 3) {
@@ -2273,7 +2267,7 @@ void CXFA_FM2JSContext::FV(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::IPmt(CFXJSE_Value* pThis,
-                             const CFX_ByteStringC& szFuncName,
+                             const ByteStringView& szFuncName,
                              CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   if (args.GetLength() != 5) {
@@ -2330,7 +2324,7 @@ void CXFA_FM2JSContext::IPmt(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::NPV(CFXJSE_Value* pThis,
-                            const CFX_ByteStringC& szFuncName,
+                            const ByteStringView& szFuncName,
                             CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   int32_t argc = args.GetLength();
@@ -2373,7 +2367,7 @@ void CXFA_FM2JSContext::NPV(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::Pmt(CFXJSE_Value* pThis,
-                            const CFX_ByteStringC& szFuncName,
+                            const ByteStringView& szFuncName,
                             CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   if (args.GetLength() != 3) {
@@ -2408,7 +2402,7 @@ void CXFA_FM2JSContext::Pmt(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::PPmt(CFXJSE_Value* pThis,
-                             const CFX_ByteStringC& szFuncName,
+                             const ByteStringView& szFuncName,
                              CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   if (args.GetLength() != 5) {
@@ -2466,7 +2460,7 @@ void CXFA_FM2JSContext::PPmt(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::PV(CFXJSE_Value* pThis,
-                           const CFX_ByteStringC& szFuncName,
+                           const ByteStringView& szFuncName,
                            CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   if (args.GetLength() != 3) {
@@ -2501,7 +2495,7 @@ void CXFA_FM2JSContext::PV(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::Rate(CFXJSE_Value* pThis,
-                             const CFX_ByteStringC& szFuncName,
+                             const ByteStringView& szFuncName,
                              CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   if (args.GetLength() != 3) {
@@ -2532,7 +2526,7 @@ void CXFA_FM2JSContext::Rate(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::Term(CFXJSE_Value* pThis,
-                             const CFX_ByteStringC& szFuncName,
+                             const ByteStringView& szFuncName,
                              CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   if (args.GetLength() != 3) {
@@ -2563,7 +2557,7 @@ void CXFA_FM2JSContext::Term(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::Choose(CFXJSE_Value* pThis,
-                               const CFX_ByteStringC& szFuncName,
+                               const ByteStringView& szFuncName,
                                CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   int32_t argc = args.GetLength();
@@ -2610,17 +2604,17 @@ void CXFA_FM2JSContext::Choose(CFXJSE_Value* pThis,
           GetObjectDefaultValue(jsObjectValue.get(), newPropertyValue.get());
         } else {
           jsObjectValue->GetObjectProperty(
-              propertyValue->ToString().AsStringC(), newPropertyValue.get());
+              propertyValue->ToString().AsStringView(), newPropertyValue.get());
         }
-        CFX_ByteString bsChosen = ValueToUTF8String(newPropertyValue.get());
-        args.GetReturnValue()->SetString(bsChosen.AsStringC());
+        ByteString bsChosen = ValueToUTF8String(newPropertyValue.get());
+        args.GetReturnValue()->SetString(bsChosen.AsStringView());
         bFound = true;
       }
     } else {
       iValueIndex++;
       if (iValueIndex == iIndex) {
-        CFX_ByteString bsChosen = ValueToUTF8String(argIndexValue.get());
-        args.GetReturnValue()->SetString(bsChosen.AsStringC());
+        ByteString bsChosen = ValueToUTF8String(argIndexValue.get());
+        args.GetReturnValue()->SetString(bsChosen.AsStringView());
         bFound = true;
       }
     }
@@ -2632,7 +2626,7 @@ void CXFA_FM2JSContext::Choose(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::Exists(CFXJSE_Value* pThis,
-                               const CFX_ByteStringC& szFuncName,
+                               const ByteStringView& szFuncName,
                                CFXJSE_Arguments& args) {
   if (args.GetLength() != 1) {
     ToJSContext(pThis, nullptr)->ThrowParamCountMismatchException(L"Exists");
@@ -2643,7 +2637,7 @@ void CXFA_FM2JSContext::Exists(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::HasValue(CFXJSE_Value* pThis,
-                                 const CFX_ByteStringC& szFuncName,
+                                 const ByteStringView& szFuncName,
                                  CFXJSE_Arguments& args) {
   if (args.GetLength() != 1) {
     ToJSContext(pThis, nullptr)->ThrowParamCountMismatchException(L"HasValue");
@@ -2657,14 +2651,14 @@ void CXFA_FM2JSContext::HasValue(CFXJSE_Value* pThis,
     return;
   }
 
-  CFX_ByteString valueStr = argOne->ToString();
+  ByteString valueStr = argOne->ToString();
   valueStr.TrimLeft();
   args.GetReturnValue()->SetInteger(!valueStr.IsEmpty());
 }
 
 // static
 void CXFA_FM2JSContext::Oneof(CFXJSE_Value* pThis,
-                              const CFX_ByteStringC& szFuncName,
+                              const ByteStringView& szFuncName,
                               CFXJSE_Arguments& args) {
   if (args.GetLength() < 2) {
     ToJSContext(pThis, nullptr)->ThrowParamCountMismatchException(L"Oneof");
@@ -2687,7 +2681,7 @@ void CXFA_FM2JSContext::Oneof(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::Within(CFXJSE_Value* pThis,
-                               const CFX_ByteStringC& szFuncName,
+                               const ByteStringView& szFuncName,
                                CFXJSE_Arguments& args) {
   if (args.GetLength() != 3) {
     ToJSContext(pThis, nullptr)->ThrowParamCountMismatchException(L"Within");
@@ -2711,17 +2705,17 @@ void CXFA_FM2JSContext::Within(CFXJSE_Value* pThis,
     return;
   }
 
-  CFX_ByteString oneString = ValueToUTF8String(argOne.get());
-  CFX_ByteString lowString = ValueToUTF8String(argLow.get());
-  CFX_ByteString heightString = ValueToUTF8String(argHigh.get());
+  ByteString oneString = ValueToUTF8String(argOne.get());
+  ByteString lowString = ValueToUTF8String(argLow.get());
+  ByteString heightString = ValueToUTF8String(argHigh.get());
   args.GetReturnValue()->SetInteger(
-      (oneString.Compare(lowString.AsStringC()) >= 0) &&
-      (oneString.Compare(heightString.AsStringC()) <= 0));
+      (oneString.Compare(lowString.AsStringView()) >= 0) &&
+      (oneString.Compare(heightString.AsStringView()) <= 0));
 }
 
 // static
 void CXFA_FM2JSContext::If(CFXJSE_Value* pThis,
-                           const CFX_ByteStringC& szFuncName,
+                           const ByteStringView& szFuncName,
                            CFXJSE_Arguments& args) {
   if (args.GetLength() != 3) {
     ToJSContext(pThis, nullptr)->ThrowParamCountMismatchException(L"If");
@@ -2735,7 +2729,7 @@ void CXFA_FM2JSContext::If(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::Eval(CFXJSE_Value* pThis,
-                             const CFX_ByteStringC& szFuncName,
+                             const ByteStringView& szFuncName,
                              CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   if (args.GetLength() != 1) {
@@ -2745,7 +2739,7 @@ void CXFA_FM2JSContext::Eval(CFXJSE_Value* pThis,
 
   v8::Isolate* pIsolate = pContext->GetScriptRuntime();
   std::unique_ptr<CFXJSE_Value> scriptValue = GetSimpleValue(pThis, args, 0);
-  CFX_ByteString utf8ScriptString = ValueToUTF8String(scriptValue.get());
+  ByteString utf8ScriptString = ValueToUTF8String(scriptValue.get());
   if (utf8ScriptString.IsEmpty()) {
     args.GetReturnValue()->SetNull();
     return;
@@ -2753,7 +2747,7 @@ void CXFA_FM2JSContext::Eval(CFXJSE_Value* pThis,
 
   CFX_WideTextBuf wsJavaScriptBuf;
   if (!CXFA_FM2JSContext::Translate(
-          CFX_WideString::FromUTF8(utf8ScriptString.AsStringC()).AsStringC(),
+          WideString::FromUTF8(utf8ScriptString.AsStringView()).AsStringView(),
           &wsJavaScriptBuf)) {
     pContext->ThrowCompilerErrorException();
     return;
@@ -2763,15 +2757,15 @@ void CXFA_FM2JSContext::Eval(CFXJSE_Value* pThis,
       CFXJSE_Context::Create(pIsolate, nullptr, nullptr));
 
   auto returnValue = pdfium::MakeUnique<CFXJSE_Value>(pIsolate);
-  pNewContext->ExecuteScript(FX_UTF8Encode(wsJavaScriptBuf.AsStringC()).c_str(),
-                             returnValue.get());
+  pNewContext->ExecuteScript(
+      FX_UTF8Encode(wsJavaScriptBuf.AsStringView()).c_str(), returnValue.get());
 
   args.GetReturnValue()->Assign(returnValue.get());
 }
 
 // static
 void CXFA_FM2JSContext::Ref(CFXJSE_Value* pThis,
-                            const CFX_ByteStringC& szFuncName,
+                            const ByteStringView& szFuncName,
                             CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   v8::Isolate* pIsolate = pContext->GetScriptRuntime();
@@ -2829,7 +2823,7 @@ void CXFA_FM2JSContext::Ref(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::UnitType(CFXJSE_Value* pThis,
-                                 const CFX_ByteStringC& szFuncName,
+                                 const ByteStringView& szFuncName,
                                  CFXJSE_Arguments& args) {
   if (args.GetLength() != 1) {
     ToJSContext(pThis, nullptr)->ThrowParamCountMismatchException(L"UnitType");
@@ -2842,7 +2836,7 @@ void CXFA_FM2JSContext::UnitType(CFXJSE_Value* pThis,
     return;
   }
 
-  CFX_ByteString unitspanString = ValueToUTF8String(unitspanValue.get());
+  ByteString unitspanString = ValueToUTF8String(unitspanValue.get());
   if (unitspanString.IsEmpty()) {
     args.GetReturnValue()->SetString("in");
     return;
@@ -2860,8 +2854,7 @@ void CXFA_FM2JSContext::UnitType(CFXJSE_Value* pThis,
     VALUETYPE_ISIN,
   };
   unitspanString.MakeLower();
-  CFX_WideString wsTypeString =
-      CFX_WideString::FromUTF8(unitspanString.AsStringC());
+  WideString wsTypeString = WideString::FromUTF8(unitspanString.AsStringView());
   const wchar_t* pData = wsTypeString.c_str();
   int32_t u = 0;
   int32_t uLen = wsTypeString.GetLength();
@@ -2937,7 +2930,7 @@ void CXFA_FM2JSContext::UnitType(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::UnitValue(CFXJSE_Value* pThis,
-                                  const CFX_ByteStringC& szFuncName,
+                                  const ByteStringView& szFuncName,
                                   CFXJSE_Arguments& args) {
   int32_t argc = args.GetLength();
   if (argc < 1 || argc > 2) {
@@ -2951,7 +2944,7 @@ void CXFA_FM2JSContext::UnitValue(CFXJSE_Value* pThis,
     return;
   }
 
-  CFX_ByteString unitspanString = ValueToUTF8String(unitspanValue.get());
+  ByteString unitspanString = ValueToUTF8String(unitspanValue.get());
   const char* pData = unitspanString.c_str();
   if (!pData) {
     args.GetReturnValue()->SetInteger(0);
@@ -2974,7 +2967,7 @@ void CXFA_FM2JSContext::UnitValue(CFXJSE_Value* pThis,
     ++u;
 
   FX_STRSIZE uLen = unitspanString.GetLength();
-  CFX_ByteString strFirstUnit;
+  ByteString strFirstUnit;
   while (u < uLen) {
     if (pData[u] == ' ')
       break;
@@ -2984,10 +2977,10 @@ void CXFA_FM2JSContext::UnitValue(CFXJSE_Value* pThis,
   }
   strFirstUnit.MakeLower();
 
-  CFX_ByteString strUnit;
+  ByteString strUnit;
   if (argc > 1) {
     std::unique_ptr<CFXJSE_Value> unitValue = GetSimpleValue(pThis, args, 1);
-    CFX_ByteString unitTempString = ValueToUTF8String(unitValue.get());
+    ByteString unitTempString = ValueToUTF8String(unitValue.get());
     const char* pChar = unitTempString.c_str();
     FX_STRSIZE uVal = 0;
     while (IsWhitespace(pChar[uVal]))
@@ -3076,7 +3069,7 @@ void CXFA_FM2JSContext::UnitValue(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::At(CFXJSE_Value* pThis,
-                           const CFX_ByteStringC& szFuncName,
+                           const ByteStringView& szFuncName,
                            CFXJSE_Arguments& args) {
   if (args.GetLength() != 2) {
     ToJSContext(pThis, nullptr)->ThrowParamCountMismatchException(L"At");
@@ -3090,20 +3083,20 @@ void CXFA_FM2JSContext::At(CFXJSE_Value* pThis,
     return;
   }
 
-  CFX_ByteString stringTwo = ValueToUTF8String(argTwo.get());
+  ByteString stringTwo = ValueToUTF8String(argTwo.get());
   if (stringTwo.IsEmpty()) {
     args.GetReturnValue()->SetInteger(1);
     return;
   }
 
-  CFX_ByteString stringOne = ValueToUTF8String(argOne.get());
-  auto pos = stringOne.Find(stringTwo.AsStringC());
+  ByteString stringOne = ValueToUTF8String(argOne.get());
+  auto pos = stringOne.Find(stringTwo.AsStringView());
   args.GetReturnValue()->SetInteger(pos.has_value() ? pos.value() + 1 : 0);
 }
 
 // static
 void CXFA_FM2JSContext::Concat(CFXJSE_Value* pThis,
-                               const CFX_ByteStringC& szFuncName,
+                               const ByteStringView& szFuncName,
                                CFXJSE_Arguments& args) {
   int32_t argc = args.GetLength();
   if (argc < 1) {
@@ -3111,7 +3104,7 @@ void CXFA_FM2JSContext::Concat(CFXJSE_Value* pThis,
     return;
   }
 
-  CFX_ByteString resultString;
+  ByteString resultString;
   bool bAllNull = true;
   for (int32_t i = 0; i < argc; i++) {
     std::unique_ptr<CFXJSE_Value> value = GetSimpleValue(pThis, args, i);
@@ -3127,12 +3120,12 @@ void CXFA_FM2JSContext::Concat(CFXJSE_Value* pThis,
     return;
   }
 
-  args.GetReturnValue()->SetString(resultString.AsStringC());
+  args.GetReturnValue()->SetString(resultString.AsStringView());
 }
 
 // static
 void CXFA_FM2JSContext::Decode(CFXJSE_Value* pThis,
-                               const CFX_ByteStringC& szFuncName,
+                               const ByteStringView& szFuncName,
                                CFXJSE_Arguments& args) {
   int32_t argc = args.GetLength();
   if (argc < 1 || argc > 2) {
@@ -3147,11 +3140,11 @@ void CXFA_FM2JSContext::Decode(CFXJSE_Value* pThis,
       return;
     }
 
-    CFX_WideString decoded = DecodeURL(
-        CFX_WideString::FromUTF8(ValueToUTF8String(argOne.get()).AsStringC()));
+    WideString decoded = DecodeURL(
+        WideString::FromUTF8(ValueToUTF8String(argOne.get()).AsStringView()));
 
     args.GetReturnValue()->SetString(
-        FX_UTF8Encode(decoded.AsStringC()).AsStringC());
+        FX_UTF8Encode(decoded.AsStringView()).AsStringView());
     return;
   }
 
@@ -3162,12 +3155,12 @@ void CXFA_FM2JSContext::Decode(CFXJSE_Value* pThis,
     return;
   }
 
-  CFX_ByteString toDecodeString = ValueToUTF8String(argOne.get());
-  CFX_ByteString identifyString = ValueToUTF8String(argTwo.get());
-  CFX_WideString decoded;
+  ByteString toDecodeString = ValueToUTF8String(argOne.get());
+  ByteString identifyString = ValueToUTF8String(argTwo.get());
+  WideString decoded;
 
-  CFX_WideString toDecodeWideString =
-      CFX_WideString::FromUTF8(toDecodeString.AsStringC());
+  WideString toDecodeWideString =
+      WideString::FromUTF8(toDecodeString.AsStringView());
 
   if (identifyString.EqualNoCase("html"))
     decoded = DecodeHTML(toDecodeWideString);
@@ -3177,11 +3170,11 @@ void CXFA_FM2JSContext::Decode(CFXJSE_Value* pThis,
     decoded = DecodeURL(toDecodeWideString);
 
   args.GetReturnValue()->SetString(
-      FX_UTF8Encode(decoded.AsStringC()).AsStringC());
+      FX_UTF8Encode(decoded.AsStringView()).AsStringView());
 }
 
 // static
-CFX_WideString CXFA_FM2JSContext::DecodeURL(const CFX_WideString& wsURLString) {
+WideString CXFA_FM2JSContext::DecodeURL(const WideString& wsURLString) {
   const wchar_t* pData = wsURLString.c_str();
   FX_STRSIZE i = 0;
   CFX_WideTextBuf wsResultBuf;
@@ -3206,7 +3199,7 @@ CFX_WideString CXFA_FM2JSContext::DecodeURL(const CFX_WideString& wsURLString) {
       } else if (ch <= 'f' && ch >= 'a') {
         chTemp += (ch - 'a' + 10) * (!iCount ? 16 : 1);
       } else {
-        return CFX_WideString();
+        return WideString();
       }
       ++iCount;
     }
@@ -3218,8 +3211,7 @@ CFX_WideString CXFA_FM2JSContext::DecodeURL(const CFX_WideString& wsURLString) {
 }
 
 // static
-CFX_WideString CXFA_FM2JSContext::DecodeHTML(
-    const CFX_WideString& wsHTMLString) {
+WideString CXFA_FM2JSContext::DecodeHTML(const WideString& wsHTMLString) {
   wchar_t strString[9];
   FX_STRSIZE iStrIndex = 0;
   FX_STRSIZE iLen = wsHTMLString.GetLength();
@@ -3241,7 +3233,7 @@ CFX_WideString CXFA_FM2JSContext::DecodeHTML(
       ++i;
       ch = pData[i];
       if (ch != 'x' && ch != 'X') {
-        return CFX_WideString();
+        return WideString();
       }
 
       ++i;
@@ -3256,7 +3248,7 @@ CFX_WideString CXFA_FM2JSContext::DecodeHTML(
           } else if (ch <= 'F' && ch >= 'A') {
             iCode += ch - 'A' + 10;
           } else {
-            return CFX_WideString();
+            return WideString();
           }
           ++i;
           // TODO(dsinclair): Postmultiply seems wrong, start at zero
@@ -3290,7 +3282,7 @@ CFX_WideString CXFA_FM2JSContext::DecodeHTML(
 }
 
 // static
-CFX_WideString CXFA_FM2JSContext::DecodeXML(const CFX_WideString& wsXMLString) {
+WideString CXFA_FM2JSContext::DecodeXML(const WideString& wsXMLString) {
   wchar_t strString[9];
   int32_t iStrIndex = 0;
   int32_t iLen = wsXMLString.GetLength();
@@ -3315,7 +3307,7 @@ CFX_WideString CXFA_FM2JSContext::DecodeXML(const CFX_WideString& wsXMLString) {
       ++i;
       ch = pData[i];
       if (ch != 'x' && ch != 'X') {
-        return CFX_WideString();
+        return WideString();
       }
 
       ++i;
@@ -3330,7 +3322,7 @@ CFX_WideString CXFA_FM2JSContext::DecodeXML(const CFX_WideString& wsXMLString) {
           } else if (ch <= 'F' && ch >= 'A') {
             iCode += ch - 'A' + 10;
           } else {
-            return CFX_WideString();
+            return WideString();
           }
           ++i;
           iCode *= 16;
@@ -3387,7 +3379,7 @@ CFX_WideString CXFA_FM2JSContext::DecodeXML(const CFX_WideString& wsXMLString) {
 
 // static
 void CXFA_FM2JSContext::Encode(CFXJSE_Value* pThis,
-                               const CFX_ByteStringC& szFuncName,
+                               const ByteStringView& szFuncName,
                                CFXJSE_Arguments& args) {
   int32_t argc = args.GetLength();
   if (argc < 1 || argc > 2) {
@@ -3402,9 +3394,9 @@ void CXFA_FM2JSContext::Encode(CFXJSE_Value* pThis,
       return;
     }
 
-    CFX_WideString encoded = EncodeURL(ValueToUTF8String(argOne.get()));
+    WideString encoded = EncodeURL(ValueToUTF8String(argOne.get()));
     args.GetReturnValue()->SetString(
-        FX_UTF8Encode(encoded.AsStringC()).AsStringC());
+        FX_UTF8Encode(encoded.AsStringView()).AsStringView());
     return;
   }
 
@@ -3415,9 +3407,9 @@ void CXFA_FM2JSContext::Encode(CFXJSE_Value* pThis,
     return;
   }
 
-  CFX_ByteString toEncodeString = ValueToUTF8String(argOne.get());
-  CFX_ByteString identifyString = ValueToUTF8String(argTwo.get());
-  CFX_WideString encoded;
+  ByteString toEncodeString = ValueToUTF8String(argOne.get());
+  ByteString identifyString = ValueToUTF8String(argTwo.get());
+  WideString encoded;
   if (identifyString.EqualNoCase("html"))
     encoded = EncodeHTML(toEncodeString);
   else if (identifyString.EqualNoCase("xml"))
@@ -3426,13 +3418,12 @@ void CXFA_FM2JSContext::Encode(CFXJSE_Value* pThis,
     encoded = EncodeURL(toEncodeString);
 
   args.GetReturnValue()->SetString(
-      FX_UTF8Encode(encoded.AsStringC()).AsStringC());
+      FX_UTF8Encode(encoded.AsStringView()).AsStringView());
 }
 
 // static
-CFX_WideString CXFA_FM2JSContext::EncodeURL(const CFX_ByteString& szURLString) {
-  CFX_WideString wsURLString =
-      CFX_WideString::FromUTF8(szURLString.AsStringC());
+WideString CXFA_FM2JSContext::EncodeURL(const ByteString& szURLString) {
+  WideString wsURLString = WideString::FromUTF8(szURLString.AsStringView());
   CFX_WideTextBuf wsResultBuf;
   wchar_t strEncode[4];
   strEncode[0] = '%';
@@ -3494,7 +3485,7 @@ CFX_WideString CXFA_FM2JSContext::EncodeURL(const CFX_ByteString& szURLString) {
       wsResultBuf.AppendChar(ch);
     } else {
       const wchar_t iRadix = 16;
-      CFX_WideString strTmp;
+      WideString strTmp;
       while (ch >= iRadix) {
         wchar_t tmp = strCode[ch % iRadix];
         ch /= iRadix;
@@ -3529,10 +3520,8 @@ CFX_WideString CXFA_FM2JSContext::EncodeURL(const CFX_ByteString& szURLString) {
 }
 
 // static
-CFX_WideString CXFA_FM2JSContext::EncodeHTML(
-    const CFX_ByteString& szHTMLString) {
-  CFX_WideString wsHTMLString =
-      CFX_WideString::FromUTF8(szHTMLString.AsStringC());
+WideString CXFA_FM2JSContext::EncodeHTML(const ByteString& szHTMLString) {
+  WideString wsHTMLString = WideString::FromUTF8(szHTMLString.AsStringView());
   const wchar_t* strCode = L"0123456789abcdef";
   wchar_t strEncode[9];
   strEncode[0] = '&';
@@ -3548,7 +3537,7 @@ CFX_WideString CXFA_FM2JSContext::EncodeHTML(
   const wchar_t* pData = wsHTMLString.c_str();
   while (i < iLen) {
     uint32_t ch = pData[i];
-    CFX_WideString htmlReserve;
+    WideString htmlReserve;
     if (HTMLCode2STR(ch, &htmlReserve)) {
       wsResultBuf.AppendChar(L'&');
       wsResultBuf << htmlReserve;
@@ -3578,9 +3567,8 @@ CFX_WideString CXFA_FM2JSContext::EncodeHTML(
 }
 
 // static
-CFX_WideString CXFA_FM2JSContext::EncodeXML(const CFX_ByteString& szXMLString) {
-  CFX_WideString wsXMLString =
-      CFX_WideString::FromUTF8(szXMLString.AsStringC());
+WideString CXFA_FM2JSContext::EncodeXML(const ByteString& szXMLString) {
+  WideString wsXMLString = WideString::FromUTF8(szXMLString.AsStringView());
   CFX_WideTextBuf wsResultBuf;
   wchar_t strEncode[9];
   strEncode[0] = '&';
@@ -3595,27 +3583,27 @@ CFX_WideString CXFA_FM2JSContext::EncodeXML(const CFX_ByteString& szXMLString) {
     switch (ch) {
       case '"':
         wsResultBuf.AppendChar('&');
-        wsResultBuf << CFX_WideStringC(L"quot");
+        wsResultBuf << WideStringView(L"quot");
         wsResultBuf.AppendChar(';');
         break;
       case '&':
         wsResultBuf.AppendChar('&');
-        wsResultBuf << CFX_WideStringC(L"amp");
+        wsResultBuf << WideStringView(L"amp");
         wsResultBuf.AppendChar(';');
         break;
       case '\'':
         wsResultBuf.AppendChar('&');
-        wsResultBuf << CFX_WideStringC(L"apos");
+        wsResultBuf << WideStringView(L"apos");
         wsResultBuf.AppendChar(';');
         break;
       case '<':
         wsResultBuf.AppendChar('&');
-        wsResultBuf << CFX_WideStringC(L"lt");
+        wsResultBuf << WideStringView(L"lt");
         wsResultBuf.AppendChar(';');
         break;
       case '>':
         wsResultBuf.AppendChar('&');
-        wsResultBuf << CFX_WideStringC(L"gt");
+        wsResultBuf << WideStringView(L"gt");
         wsResultBuf.AppendChar(';');
         break;
       default: {
@@ -3646,10 +3634,10 @@ CFX_WideString CXFA_FM2JSContext::EncodeXML(const CFX_ByteString& szXMLString) {
 }
 
 // static
-bool CXFA_FM2JSContext::HTMLSTR2Code(const CFX_WideStringC& pData,
+bool CXFA_FM2JSContext::HTMLSTR2Code(const WideStringView& pData,
                                      uint32_t* iCode) {
   auto cmpFunc = [](const XFA_FMHtmlReserveCode& iter,
-                    const CFX_WideStringC& val) {
+                    const WideStringView& val) {
     // TODO(tsepez): check usage of c_str() below.
     return wcscmp(val.unterminated_c_str(), iter.m_htmlReserve) > 0;
   };
@@ -3666,7 +3654,7 @@ bool CXFA_FM2JSContext::HTMLSTR2Code(const CFX_WideStringC& pData,
 
 // static
 bool CXFA_FM2JSContext::HTMLCode2STR(uint32_t iCode,
-                                     CFX_WideString* wsHTMLReserve) {
+                                     WideString* wsHTMLReserve) {
   auto cmpFunc = [](const XFA_FMHtmlReserveCode iter, const uint32_t& val) {
     return iter.m_uCode < val;
   };
@@ -3682,7 +3670,7 @@ bool CXFA_FM2JSContext::HTMLCode2STR(uint32_t iCode,
 
 // static
 void CXFA_FM2JSContext::Format(CFXJSE_Value* pThis,
-                               const CFX_ByteStringC& szFuncName,
+                               const ByteStringView& szFuncName,
                                CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   if (args.GetLength() < 2) {
@@ -3691,10 +3679,10 @@ void CXFA_FM2JSContext::Format(CFXJSE_Value* pThis,
   }
 
   std::unique_ptr<CFXJSE_Value> argOne = GetSimpleValue(pThis, args, 0);
-  CFX_ByteString szPattern = ValueToUTF8String(argOne.get());
+  ByteString szPattern = ValueToUTF8String(argOne.get());
 
   std::unique_ptr<CFXJSE_Value> argTwo = GetSimpleValue(pThis, args, 1);
-  CFX_ByteString szValue = ValueToUTF8String(argTwo.get());
+  ByteString szValue = ValueToUTF8String(argTwo.get());
 
   CXFA_Document* pDoc = pContext->GetDocument();
   CXFA_LocaleMgr* pMgr = pDoc->GetLocalMgr();
@@ -3704,9 +3692,9 @@ void CXFA_FM2JSContext::Format(CFXJSE_Value* pThis,
   CXFA_WidgetData widgetData(pThisNode);
   IFX_Locale* pLocale = widgetData.GetLocal();
   uint32_t patternType;
-  CFX_WideString wsPattern = CFX_WideString::FromUTF8(szPattern.AsStringC());
-  CFX_WideString wsValue = CFX_WideString::FromUTF8(szValue.AsStringC());
-  if (!PatternStringType(szPattern.AsStringC(), patternType)) {
+  WideString wsPattern = WideString::FromUTF8(szPattern.AsStringView());
+  WideString wsValue = WideString::FromUTF8(szValue.AsStringView());
+  if (!PatternStringType(szPattern.AsStringView(), patternType)) {
     switch (patternType) {
       case XFA_VT_DATETIME: {
         auto iTChar = wsPattern.Find(L'T');
@@ -3714,10 +3702,10 @@ void CXFA_FM2JSContext::Format(CFXJSE_Value* pThis,
           args.GetReturnValue()->SetString("");
           return;
         }
-        CFX_WideString wsDatePattern(L"date{");
+        WideString wsDatePattern(L"date{");
         wsDatePattern += wsPattern.Left(iTChar.value()) + L"} ";
 
-        CFX_WideString wsTimePattern(L"time{");
+        WideString wsTimePattern(L"time{");
         wsTimePattern +=
             wsPattern.Right(wsPattern.GetLength() - (iTChar.value() + 1)) +
             L"}";
@@ -3736,7 +3724,7 @@ void CXFA_FM2JSContext::Format(CFXJSE_Value* pThis,
         wsPattern = L"num{" + wsPattern + L"}";
       } break;
       default: {
-        CFX_WideString wsTestPattern;
+        WideString wsTestPattern;
         wsTestPattern = L"num{" + wsPattern + L"}";
         CXFA_LocaleValue tempLocaleValue(XFA_VT_FLOAT, wsValue, wsTestPattern,
                                          pLocale, pMgr);
@@ -3752,19 +3740,19 @@ void CXFA_FM2JSContext::Format(CFXJSE_Value* pThis,
     }
   }
   CXFA_LocaleValue localeValue(patternType, wsValue, wsPattern, pLocale, pMgr);
-  CFX_WideString wsRet;
+  WideString wsRet;
   if (!localeValue.FormatPatterns(wsRet, wsPattern, pLocale,
                                   XFA_VALUEPICTURE_Display)) {
     args.GetReturnValue()->SetString("");
     return;
   }
 
-  args.GetReturnValue()->SetString(wsRet.UTF8Encode().AsStringC());
+  args.GetReturnValue()->SetString(wsRet.UTF8Encode().AsStringView());
 }
 
 // static
 void CXFA_FM2JSContext::Left(CFXJSE_Value* pThis,
-                             const CFX_ByteStringC& szFuncName,
+                             const ByteStringView& szFuncName,
                              CFXJSE_Arguments& args) {
   if (args.GetLength() != 2) {
     ToJSContext(pThis, nullptr)->ThrowParamCountMismatchException(L"Left");
@@ -3779,14 +3767,14 @@ void CXFA_FM2JSContext::Left(CFXJSE_Value* pThis,
     return;
   }
 
-  CFX_ByteString sourceString = ValueToUTF8String(argOne.get());
+  ByteString sourceString = ValueToUTF8String(argOne.get());
   int32_t count = std::max(0, ValueToInteger(pThis, argTwo.get()));
-  args.GetReturnValue()->SetString(sourceString.Left(count).AsStringC());
+  args.GetReturnValue()->SetString(sourceString.Left(count).AsStringView());
 }
 
 // static
 void CXFA_FM2JSContext::Len(CFXJSE_Value* pThis,
-                            const CFX_ByteStringC& szFuncName,
+                            const ByteStringView& szFuncName,
                             CFXJSE_Arguments& args) {
   if (args.GetLength() != 1) {
     ToJSContext(pThis, nullptr)->ThrowParamCountMismatchException(L"Len");
@@ -3799,13 +3787,13 @@ void CXFA_FM2JSContext::Len(CFXJSE_Value* pThis,
     return;
   }
 
-  CFX_ByteString sourceString = ValueToUTF8String(argOne.get());
+  ByteString sourceString = ValueToUTF8String(argOne.get());
   args.GetReturnValue()->SetInteger(sourceString.GetLength());
 }
 
 // static
 void CXFA_FM2JSContext::Lower(CFXJSE_Value* pThis,
-                              const CFX_ByteStringC& szFuncName,
+                              const ByteStringView& szFuncName,
                               CFXJSE_Arguments& args) {
   int32_t argc = args.GetLength();
   if (argc < 1 || argc > 2) {
@@ -3820,8 +3808,8 @@ void CXFA_FM2JSContext::Lower(CFXJSE_Value* pThis,
   }
 
   CFX_WideTextBuf lowStringBuf;
-  CFX_ByteString argString = ValueToUTF8String(argOne.get());
-  CFX_WideString wsArgString = CFX_WideString::FromUTF8(argString.AsStringC());
+  ByteString argString = ValueToUTF8String(argOne.get());
+  WideString wsArgString = WideString::FromUTF8(argString.AsStringView());
   const wchar_t* pData = wsArgString.c_str();
   FX_STRSIZE i = 0;
   while (i < argString.GetLength()) {
@@ -3837,12 +3825,12 @@ void CXFA_FM2JSContext::Lower(CFXJSE_Value* pThis,
   lowStringBuf.AppendChar(0);
 
   args.GetReturnValue()->SetString(
-      FX_UTF8Encode(lowStringBuf.AsStringC()).AsStringC());
+      FX_UTF8Encode(lowStringBuf.AsStringView()).AsStringView());
 }
 
 // static
 void CXFA_FM2JSContext::Ltrim(CFXJSE_Value* pThis,
-                              const CFX_ByteStringC& szFuncName,
+                              const ByteStringView& szFuncName,
                               CFXJSE_Arguments& args) {
   if (args.GetLength() != 1) {
     ToJSContext(pThis, nullptr)->ThrowParamCountMismatchException(L"Ltrim");
@@ -3855,14 +3843,14 @@ void CXFA_FM2JSContext::Ltrim(CFXJSE_Value* pThis,
     return;
   }
 
-  CFX_ByteString sourceString = ValueToUTF8String(argOne.get());
+  ByteString sourceString = ValueToUTF8String(argOne.get());
   sourceString.TrimLeft();
-  args.GetReturnValue()->SetString(sourceString.AsStringC());
+  args.GetReturnValue()->SetString(sourceString.AsStringView());
 }
 
 // static
 void CXFA_FM2JSContext::Parse(CFXJSE_Value* pThis,
-                              const CFX_ByteStringC& szFuncName,
+                              const ByteStringView& szFuncName,
                               CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   if (args.GetLength() != 2) {
@@ -3877,8 +3865,8 @@ void CXFA_FM2JSContext::Parse(CFXJSE_Value* pThis,
     return;
   }
 
-  CFX_ByteString szPattern = ValueToUTF8String(argOne.get());
-  CFX_ByteString szValue = ValueToUTF8String(argTwo.get());
+  ByteString szPattern = ValueToUTF8String(argOne.get());
+  ByteString szValue = ValueToUTF8String(argTwo.get());
   CXFA_Document* pDoc = pContext->GetDocument();
   CXFA_LocaleMgr* pMgr = pDoc->GetLocalMgr();
   CXFA_Node* pThisNode = ToNode(pDoc->GetScriptContext()->GetThisObject());
@@ -3886,10 +3874,10 @@ void CXFA_FM2JSContext::Parse(CFXJSE_Value* pThis,
 
   CXFA_WidgetData widgetData(pThisNode);
   IFX_Locale* pLocale = widgetData.GetLocal();
-  CFX_WideString wsPattern = CFX_WideString::FromUTF8(szPattern.AsStringC());
-  CFX_WideString wsValue = CFX_WideString::FromUTF8(szValue.AsStringC());
+  WideString wsPattern = WideString::FromUTF8(szPattern.AsStringView());
+  WideString wsValue = WideString::FromUTF8(szValue.AsStringView());
   uint32_t patternType;
-  if (PatternStringType(szPattern.AsStringC(), patternType)) {
+  if (PatternStringType(szPattern.AsStringView(), patternType)) {
     CXFA_LocaleValue localeValue(patternType, wsValue, wsPattern, pLocale,
                                  pMgr);
     if (!localeValue.IsValid()) {
@@ -3897,7 +3885,7 @@ void CXFA_FM2JSContext::Parse(CFXJSE_Value* pThis,
       return;
     }
     args.GetReturnValue()->SetString(
-        localeValue.GetValue().UTF8Encode().AsStringC());
+        localeValue.GetValue().UTF8Encode().AsStringView());
     return;
   }
 
@@ -3908,9 +3896,9 @@ void CXFA_FM2JSContext::Parse(CFXJSE_Value* pThis,
         args.GetReturnValue()->SetString("");
         return;
       }
-      CFX_WideString wsDatePattern(L"date{" + wsPattern.Left(iTChar.value()) +
-                                   L"} ");
-      CFX_WideString wsTimePattern(
+      WideString wsDatePattern(L"date{" + wsPattern.Left(iTChar.value()) +
+                               L"} ");
+      WideString wsTimePattern(
           L"time{" +
           wsPattern.Right(wsPattern.GetLength() - (iTChar.value() + 1)) + L"}");
       wsPattern = wsDatePattern + wsTimePattern;
@@ -3921,7 +3909,7 @@ void CXFA_FM2JSContext::Parse(CFXJSE_Value* pThis,
         return;
       }
       args.GetReturnValue()->SetString(
-          localeValue.GetValue().UTF8Encode().AsStringC());
+          localeValue.GetValue().UTF8Encode().AsStringView());
       return;
     }
     case XFA_VT_DATE: {
@@ -3933,7 +3921,7 @@ void CXFA_FM2JSContext::Parse(CFXJSE_Value* pThis,
         return;
       }
       args.GetReturnValue()->SetString(
-          localeValue.GetValue().UTF8Encode().AsStringC());
+          localeValue.GetValue().UTF8Encode().AsStringView());
       return;
     }
     case XFA_VT_TIME: {
@@ -3945,7 +3933,7 @@ void CXFA_FM2JSContext::Parse(CFXJSE_Value* pThis,
         return;
       }
       args.GetReturnValue()->SetString(
-          localeValue.GetValue().UTF8Encode().AsStringC());
+          localeValue.GetValue().UTF8Encode().AsStringView());
       return;
     }
     case XFA_VT_TEXT: {
@@ -3957,7 +3945,7 @@ void CXFA_FM2JSContext::Parse(CFXJSE_Value* pThis,
         return;
       }
       args.GetReturnValue()->SetString(
-          localeValue.GetValue().UTF8Encode().AsStringC());
+          localeValue.GetValue().UTF8Encode().AsStringView());
       return;
     }
     case XFA_VT_FLOAT: {
@@ -3972,7 +3960,7 @@ void CXFA_FM2JSContext::Parse(CFXJSE_Value* pThis,
       return;
     }
     default: {
-      CFX_WideString wsTestPattern;
+      WideString wsTestPattern;
       wsTestPattern = L"num{" + wsPattern + L"}";
       CXFA_LocaleValue localeValue(XFA_VT_FLOAT, wsValue, wsTestPattern,
                                    pLocale, pMgr);
@@ -3989,7 +3977,7 @@ void CXFA_FM2JSContext::Parse(CFXJSE_Value* pThis,
         return;
       }
       args.GetReturnValue()->SetString(
-          localeValue2.GetValue().UTF8Encode().AsStringC());
+          localeValue2.GetValue().UTF8Encode().AsStringView());
       return;
     }
   }
@@ -3997,7 +3985,7 @@ void CXFA_FM2JSContext::Parse(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::Replace(CFXJSE_Value* pThis,
-                                const CFX_ByteStringC& szFuncName,
+                                const ByteStringView& szFuncName,
                                 CFXJSE_Arguments& args) {
   int32_t argc = args.GetLength();
   if (argc < 2 || argc > 3) {
@@ -4007,14 +3995,14 @@ void CXFA_FM2JSContext::Replace(CFXJSE_Value* pThis,
 
   std::unique_ptr<CFXJSE_Value> argOne = GetSimpleValue(pThis, args, 0);
   std::unique_ptr<CFXJSE_Value> argTwo = GetSimpleValue(pThis, args, 1);
-  CFX_ByteString oneString;
-  CFX_ByteString twoString;
+  ByteString oneString;
+  ByteString twoString;
   if (!ValueIsNull(pThis, argOne.get()) && !ValueIsNull(pThis, argTwo.get())) {
     oneString = ValueToUTF8String(argOne.get());
     twoString = ValueToUTF8String(argTwo.get());
   }
 
-  CFX_ByteString threeString;
+  ByteString threeString;
   if (argc > 2) {
     std::unique_ptr<CFXJSE_Value> argThree = GetSimpleValue(pThis, args, 2);
     threeString = ValueToUTF8String(argThree.get());
@@ -4051,12 +4039,12 @@ void CXFA_FM2JSContext::Replace(CFXJSE_Value* pThis,
     }
   }
   resultString << '\0';
-  args.GetReturnValue()->SetString(CFX_ByteStringC(resultString.str().c_str()));
+  args.GetReturnValue()->SetString(ByteStringView(resultString.str().c_str()));
 }
 
 // static
 void CXFA_FM2JSContext::Right(CFXJSE_Value* pThis,
-                              const CFX_ByteStringC& szFuncName,
+                              const ByteStringView& szFuncName,
                               CFXJSE_Arguments& args) {
   if (args.GetLength() != 2) {
     ToJSContext(pThis, nullptr)->ThrowParamCountMismatchException(L"Right");
@@ -4071,14 +4059,14 @@ void CXFA_FM2JSContext::Right(CFXJSE_Value* pThis,
     return;
   }
 
-  CFX_ByteString sourceString = ValueToUTF8String(argOne.get());
+  ByteString sourceString = ValueToUTF8String(argOne.get());
   int32_t count = std::max(0, ValueToInteger(pThis, argTwo.get()));
-  args.GetReturnValue()->SetString(sourceString.Right(count).AsStringC());
+  args.GetReturnValue()->SetString(sourceString.Right(count).AsStringView());
 }
 
 // static
 void CXFA_FM2JSContext::Rtrim(CFXJSE_Value* pThis,
-                              const CFX_ByteStringC& szFuncName,
+                              const ByteStringView& szFuncName,
                               CFXJSE_Arguments& args) {
   if (args.GetLength() != 1) {
     ToJSContext(pThis, nullptr)->ThrowParamCountMismatchException(L"Rtrim");
@@ -4091,14 +4079,14 @@ void CXFA_FM2JSContext::Rtrim(CFXJSE_Value* pThis,
     return;
   }
 
-  CFX_ByteString sourceString = ValueToUTF8String(argOne.get());
+  ByteString sourceString = ValueToUTF8String(argOne.get());
   sourceString.TrimRight();
-  args.GetReturnValue()->SetString(sourceString.AsStringC());
+  args.GetReturnValue()->SetString(sourceString.AsStringView());
 }
 
 // static
 void CXFA_FM2JSContext::Space(CFXJSE_Value* pThis,
-                              const CFX_ByteStringC& szFuncName,
+                              const ByteStringView& szFuncName,
                               CFXJSE_Arguments& args) {
   if (args.GetLength() != 1) {
     ToJSContext(pThis, nullptr)->ThrowParamCountMismatchException(L"Space");
@@ -4119,12 +4107,12 @@ void CXFA_FM2JSContext::Space(CFXJSE_Value* pThis,
     index++;
   }
   spaceString << '\0';
-  args.GetReturnValue()->SetString(CFX_ByteStringC(spaceString.str().c_str()));
+  args.GetReturnValue()->SetString(ByteStringView(spaceString.str().c_str()));
 }
 
 // static
 void CXFA_FM2JSContext::Str(CFXJSE_Value* pThis,
-                            const CFX_ByteStringC& szFuncName,
+                            const ByteStringView& szFuncName,
                             CFXJSE_Arguments& args) {
   int32_t argc = args.GetLength();
   if (argc < 1 || argc > 3) {
@@ -4153,11 +4141,11 @@ void CXFA_FM2JSContext::Str(CFXJSE_Value* pThis,
         0, static_cast<int32_t>(ValueToFloat(pThis, precisionValue.get())));
   }
 
-  CFX_ByteString numberString;
-  CFX_ByteString formatStr = "%";
+  ByteString numberString;
+  ByteString formatStr = "%";
   if (iPrecision) {
     formatStr += ".";
-    formatStr += CFX_ByteString::FormatInteger(iPrecision);
+    formatStr += ByteString::FormatInteger(iPrecision);
   }
   formatStr += "f";
   numberString.Format(formatStr.c_str(), fNumber);
@@ -4180,7 +4168,7 @@ void CXFA_FM2JSContext::Str(CFXJSE_Value* pThis,
       ++i;
     }
     resultBuf << '\0';
-    args.GetReturnValue()->SetString(CFX_ByteStringC(resultBuf.str().c_str()));
+    args.GetReturnValue()->SetString(ByteStringView(resultBuf.str().c_str()));
     return;
   }
 
@@ -4199,7 +4187,7 @@ void CXFA_FM2JSContext::Str(CFXJSE_Value* pThis,
       }
       resultBuf << pData;
     }
-    args.GetReturnValue()->SetString(CFX_ByteStringC(resultBuf.str().c_str()));
+    args.GetReturnValue()->SetString(ByteStringView(resultBuf.str().c_str()));
     return;
   }
 
@@ -4235,12 +4223,12 @@ void CXFA_FM2JSContext::Str(CFXJSE_Value* pThis,
     ++i;
   }
   resultBuf << '\0';
-  args.GetReturnValue()->SetString(CFX_ByteStringC(resultBuf.str().c_str()));
+  args.GetReturnValue()->SetString(ByteStringView(resultBuf.str().c_str()));
 }
 
 // static
 void CXFA_FM2JSContext::Stuff(CFXJSE_Value* pThis,
-                              const CFX_ByteStringC& szFuncName,
+                              const ByteStringView& szFuncName,
                               CFXJSE_Arguments& args) {
   int32_t argc = args.GetLength();
   if (argc < 3 || argc > 4) {
@@ -4248,8 +4236,8 @@ void CXFA_FM2JSContext::Stuff(CFXJSE_Value* pThis,
     return;
   }
 
-  CFX_ByteString sourceString;
-  CFX_ByteString insertString;
+  ByteString sourceString;
+  ByteString insertString;
   int32_t iLength = 0;
   int32_t iStart = 0;
   int32_t iDelete = 0;
@@ -4279,19 +4267,19 @@ void CXFA_FM2JSContext::Stuff(CFXJSE_Value* pThis,
     resultString << static_cast<char>(sourceString[i]);
     ++i;
   }
-  resultString << insertString.AsStringC();
+  resultString << insertString.AsStringView();
   i = iStart + iDelete;
   while (i < iLength) {
     resultString << static_cast<char>(sourceString[i]);
     ++i;
   }
   resultString << '\0';
-  args.GetReturnValue()->SetString(CFX_ByteStringC(resultString.str().c_str()));
+  args.GetReturnValue()->SetString(ByteStringView(resultString.str().c_str()));
 }
 
 // static
 void CXFA_FM2JSContext::Substr(CFXJSE_Value* pThis,
-                               const CFX_ByteStringC& szFuncName,
+                               const ByteStringView& szFuncName,
                                CFXJSE_Arguments& args) {
   if (args.GetLength() != 3) {
     ToJSContext(pThis, nullptr)->ThrowParamCountMismatchException(L"Substr");
@@ -4310,7 +4298,7 @@ void CXFA_FM2JSContext::Substr(CFXJSE_Value* pThis,
 
   int32_t iStart = 0;
   int32_t iCount = 0;
-  CFX_ByteString szSourceStr = ValueToUTF8String(stringValue.get());
+  ByteString szSourceStr = ValueToUTF8String(stringValue.get());
   int32_t iLength = szSourceStr.GetLength();
   if (iLength == 0) {
     args.GetReturnValue()->SetString("");
@@ -4323,12 +4311,13 @@ void CXFA_FM2JSContext::Substr(CFXJSE_Value* pThis,
       std::max(0, static_cast<int32_t>(ValueToFloat(pThis, endValue.get())));
 
   iStart -= 1;
-  args.GetReturnValue()->SetString(szSourceStr.Mid(iStart, iCount).AsStringC());
+  args.GetReturnValue()->SetString(
+      szSourceStr.Mid(iStart, iCount).AsStringView());
 }
 
 // static
 void CXFA_FM2JSContext::Uuid(CFXJSE_Value* pThis,
-                             const CFX_ByteStringC& szFuncName,
+                             const ByteStringView& szFuncName,
                              CFXJSE_Arguments& args) {
   int32_t argc = args.GetLength();
   if (argc < 0 || argc > 1) {
@@ -4341,12 +4330,12 @@ void CXFA_FM2JSContext::Uuid(CFXJSE_Value* pThis,
     std::unique_ptr<CFXJSE_Value> argOne = GetSimpleValue(pThis, args, 0);
     iNum = static_cast<int32_t>(ValueToFloat(pThis, argOne.get()));
   }
-  args.GetReturnValue()->SetString(GUIDString(!!iNum).AsStringC());
+  args.GetReturnValue()->SetString(GUIDString(!!iNum).AsStringView());
 }
 
 // static
 void CXFA_FM2JSContext::Upper(CFXJSE_Value* pThis,
-                              const CFX_ByteStringC& szFuncName,
+                              const ByteStringView& szFuncName,
                               CFXJSE_Arguments& args) {
   int32_t argc = args.GetLength();
   if (argc < 1 || argc > 2) {
@@ -4361,8 +4350,8 @@ void CXFA_FM2JSContext::Upper(CFXJSE_Value* pThis,
   }
 
   CFX_WideTextBuf upperStringBuf;
-  CFX_ByteString argString = ValueToUTF8String(argOne.get());
-  CFX_WideString wsArgString = CFX_WideString::FromUTF8(argString.AsStringC());
+  ByteString argString = ValueToUTF8String(argOne.get());
+  WideString wsArgString = WideString::FromUTF8(argString.AsStringView());
   const wchar_t* pData = wsArgString.c_str();
   FX_STRSIZE i = 0;
   while (i < wsArgString.GetLength()) {
@@ -4378,12 +4367,12 @@ void CXFA_FM2JSContext::Upper(CFXJSE_Value* pThis,
   upperStringBuf.AppendChar(0);
 
   args.GetReturnValue()->SetString(
-      FX_UTF8Encode(upperStringBuf.AsStringC()).AsStringC());
+      FX_UTF8Encode(upperStringBuf.AsStringView()).AsStringView());
 }
 
 // static
 void CXFA_FM2JSContext::WordNum(CFXJSE_Value* pThis,
-                                const CFX_ByteStringC& szFuncName,
+                                const ByteStringView& szFuncName,
                                 CFXJSE_Arguments& args) {
   int32_t argc = args.GetLength();
   if (argc < 1 || argc > 3) {
@@ -4410,7 +4399,7 @@ void CXFA_FM2JSContext::WordNum(CFXJSE_Value* pThis,
         static_cast<int32_t>(ValueToFloat(pThis, identifierValue.get()));
   }
 
-  CFX_ByteString localeString;
+  ByteString localeString;
   if (argc > 2) {
     std::unique_ptr<CFXJSE_Value> localeValue = GetSimpleValue(pThis, args, 2);
     if (localeValue->IsNull()) {
@@ -4425,27 +4414,27 @@ void CXFA_FM2JSContext::WordNum(CFXJSE_Value* pThis,
     return;
   }
 
-  CFX_ByteString numberString;
+  ByteString numberString;
   numberString.Format("%.2f", fNumber);
 
   args.GetReturnValue()->SetString(
-      WordUS(numberString, iIdentifier).AsStringC());
+      WordUS(numberString, iIdentifier).AsStringView());
 }
 
 // static
-CFX_ByteString CXFA_FM2JSContext::TrillionUS(const CFX_ByteStringC& szData) {
+ByteString CXFA_FM2JSContext::TrillionUS(const ByteStringView& szData) {
   std::ostringstream strBuf;
-  CFX_ByteStringC pUnits[] = {"zero", "one", "two",   "three", "four",
-                              "five", "six", "seven", "eight", "nine"};
-  CFX_ByteStringC pCapUnits[] = {"Zero", "One", "Two",   "Three", "Four",
-                                 "Five", "Six", "Seven", "Eight", "Nine"};
-  CFX_ByteStringC pTens[] = {"Ten",      "Eleven",  "Twelve",  "Thirteen",
-                             "Fourteen", "Fifteen", "Sixteen", "Seventeen",
-                             "Eighteen", "Nineteen"};
-  CFX_ByteStringC pLastTens[] = {"Twenty", "Thirty",  "Forty",  "Fifty",
-                                 "Sixty",  "Seventy", "Eighty", "Ninety"};
-  CFX_ByteStringC pComm[] = {" Hundred ", " Thousand ", " Million ",
-                             " Billion ", "Trillion"};
+  ByteStringView pUnits[] = {"zero", "one", "two",   "three", "four",
+                             "five", "six", "seven", "eight", "nine"};
+  ByteStringView pCapUnits[] = {"Zero", "One", "Two",   "Three", "Four",
+                                "Five", "Six", "Seven", "Eight", "Nine"};
+  ByteStringView pTens[] = {"Ten",      "Eleven",  "Twelve",  "Thirteen",
+                            "Fourteen", "Fifteen", "Sixteen", "Seventeen",
+                            "Eighteen", "Nineteen"};
+  ByteStringView pLastTens[] = {"Twenty", "Thirty",  "Forty",  "Fifty",
+                                "Sixty",  "Seventy", "Eighty", "Ninety"};
+  ByteStringView pComm[] = {" Hundred ", " Thousand ", " Million ", " Billion ",
+                            "Trillion"};
   const char* pData = szData.unterminated_c_str();
   int32_t iLength = szData.GetLength();
   int32_t iComm = 0;
@@ -4529,16 +4518,15 @@ CFX_ByteString CXFA_FM2JSContext::TrillionUS(const CFX_ByteStringC& szData) {
     }
     iIndex += 3;
   }
-  return CFX_ByteString(strBuf);
+  return ByteString(strBuf);
 }
 
 // static
-CFX_ByteString CXFA_FM2JSContext::WordUS(const CFX_ByteString& szData,
-                                         int32_t iStyle) {
+ByteString CXFA_FM2JSContext::WordUS(const ByteString& szData, int32_t iStyle) {
   const char* pData = szData.c_str();
   int32_t iLength = szData.GetLength();
   if (iStyle < 0 || iStyle > 2) {
-    return CFX_ByteString();
+    return ByteString();
   }
 
   std::ostringstream strBuf;
@@ -4556,7 +4544,7 @@ CFX_ByteString CXFA_FM2JSContext::WordUS(const CFX_ByteString& szData,
     if (!iCount && iInteger - iIndex > 0)
       iCount = 12;
 
-    strBuf << TrillionUS(CFX_ByteStringC(pData + iIndex, iCount));
+    strBuf << TrillionUS(ByteStringView(pData + iIndex, iCount));
     iIndex += iCount;
     if (iIndex < iInteger)
       strBuf << " Trillion ";
@@ -4573,19 +4561,19 @@ CFX_ByteString CXFA_FM2JSContext::WordUS(const CFX_ByteString& szData,
       if (!iCount && iLength - iIndex > 0)
         iCount = 12;
 
-      strBuf << TrillionUS(CFX_ByteStringC(pData + iIndex, iCount));
+      strBuf << TrillionUS(ByteStringView(pData + iIndex, iCount));
       iIndex += iCount;
       if (iIndex < iLength)
         strBuf << " Trillion ";
     }
     strBuf << " Cents";
   }
-  return CFX_ByteString(strBuf);
+  return ByteString(strBuf);
 }
 
 // static
 void CXFA_FM2JSContext::Get(CFXJSE_Value* pThis,
-                            const CFX_ByteStringC& szFuncName,
+                            const ByteStringView& szFuncName,
                             CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   if (args.GetLength() != 1) {
@@ -4602,21 +4590,21 @@ void CXFA_FM2JSContext::Get(CFXJSE_Value* pThis,
     return;
 
   std::unique_ptr<CFXJSE_Value> argOne = GetSimpleValue(pThis, args, 0);
-  CFX_ByteString urlString = ValueToUTF8String(argOne.get());
-  CFX_RetainPtr<IFX_SeekableReadStream> pFile = pAppProvider->DownloadURL(
-      CFX_WideString::FromUTF8(urlString.AsStringC()));
+  ByteString urlString = ValueToUTF8String(argOne.get());
+  CFX_RetainPtr<IFX_SeekableReadStream> pFile =
+      pAppProvider->DownloadURL(WideString::FromUTF8(urlString.AsStringView()));
   if (!pFile)
     return;
 
   int32_t size = pFile->GetSize();
   std::vector<uint8_t> dataBuf(size);
   pFile->ReadBlock(dataBuf.data(), size);
-  args.GetReturnValue()->SetString(CFX_ByteStringC(dataBuf));
+  args.GetReturnValue()->SetString(ByteStringView(dataBuf));
 }
 
 // static
 void CXFA_FM2JSContext::Post(CFXJSE_Value* pThis,
-                             const CFX_ByteStringC& szFuncName,
+                             const ByteStringView& szFuncName,
                              CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   int32_t argc = args.GetLength();
@@ -4634,45 +4622,45 @@ void CXFA_FM2JSContext::Post(CFXJSE_Value* pThis,
     return;
 
   std::unique_ptr<CFXJSE_Value> argOne = GetSimpleValue(pThis, args, 0);
-  CFX_ByteString bsURL = ValueToUTF8String(argOne.get());
+  ByteString bsURL = ValueToUTF8String(argOne.get());
 
   std::unique_ptr<CFXJSE_Value> argTwo = GetSimpleValue(pThis, args, 1);
-  CFX_ByteString bsData = ValueToUTF8String(argTwo.get());
+  ByteString bsData = ValueToUTF8String(argTwo.get());
 
-  CFX_ByteString bsContentType;
+  ByteString bsContentType;
   if (argc > 2) {
     std::unique_ptr<CFXJSE_Value> argThree = GetSimpleValue(pThis, args, 2);
     bsContentType = ValueToUTF8String(argThree.get());
   }
 
-  CFX_ByteString bsEncode;
+  ByteString bsEncode;
   if (argc > 3) {
     std::unique_ptr<CFXJSE_Value> argFour = GetSimpleValue(pThis, args, 3);
     bsEncode = ValueToUTF8String(argFour.get());
   }
 
-  CFX_ByteString bsHeader;
+  ByteString bsHeader;
   if (argc > 4) {
     std::unique_ptr<CFXJSE_Value> argFive = GetSimpleValue(pThis, args, 4);
     bsHeader = ValueToUTF8String(argFive.get());
   }
 
-  CFX_WideString decodedResponse;
+  WideString decodedResponse;
   if (!pAppProvider->PostRequestURL(
-          CFX_WideString::FromUTF8(bsURL.AsStringC()),
-          CFX_WideString::FromUTF8(bsData.AsStringC()),
-          CFX_WideString::FromUTF8(bsContentType.AsStringC()),
-          CFX_WideString::FromUTF8(bsEncode.AsStringC()),
-          CFX_WideString::FromUTF8(bsHeader.AsStringC()), decodedResponse)) {
+          WideString::FromUTF8(bsURL.AsStringView()),
+          WideString::FromUTF8(bsData.AsStringView()),
+          WideString::FromUTF8(bsContentType.AsStringView()),
+          WideString::FromUTF8(bsEncode.AsStringView()),
+          WideString::FromUTF8(bsHeader.AsStringView()), decodedResponse)) {
     pContext->ThrowServerDeniedException();
     return;
   }
-  args.GetReturnValue()->SetString(decodedResponse.UTF8Encode().AsStringC());
+  args.GetReturnValue()->SetString(decodedResponse.UTF8Encode().AsStringView());
 }
 
 // static
 void CXFA_FM2JSContext::Put(CFXJSE_Value* pThis,
-                            const CFX_ByteStringC& szFuncName,
+                            const ByteStringView& szFuncName,
                             CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   int32_t argc = args.GetLength();
@@ -4690,21 +4678,21 @@ void CXFA_FM2JSContext::Put(CFXJSE_Value* pThis,
     return;
 
   std::unique_ptr<CFXJSE_Value> argOne = GetSimpleValue(pThis, args, 0);
-  CFX_ByteString bsURL = ValueToUTF8String(argOne.get());
+  ByteString bsURL = ValueToUTF8String(argOne.get());
 
   std::unique_ptr<CFXJSE_Value> argTwo = GetSimpleValue(pThis, args, 1);
-  CFX_ByteString bsData = ValueToUTF8String(argTwo.get());
+  ByteString bsData = ValueToUTF8String(argTwo.get());
 
-  CFX_ByteString bsEncode;
+  ByteString bsEncode;
   if (argc > 2) {
     std::unique_ptr<CFXJSE_Value> argThree = GetSimpleValue(pThis, args, 2);
     bsEncode = ValueToUTF8String(argThree.get());
   }
 
   if (!pAppProvider->PutRequestURL(
-          CFX_WideString::FromUTF8(bsURL.AsStringC()),
-          CFX_WideString::FromUTF8(bsData.AsStringC()),
-          CFX_WideString::FromUTF8(bsEncode.AsStringC()))) {
+          WideString::FromUTF8(bsURL.AsStringView()),
+          WideString::FromUTF8(bsData.AsStringView()),
+          WideString::FromUTF8(bsEncode.AsStringView()))) {
     pContext->ThrowServerDeniedException();
     return;
   }
@@ -4714,7 +4702,7 @@ void CXFA_FM2JSContext::Put(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::assign_value_operator(CFXJSE_Value* pThis,
-                                              const CFX_ByteStringC& szFuncName,
+                                              const ByteStringView& szFuncName,
                                               CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   if (args.GetLength() != 2) {
@@ -4743,8 +4731,8 @@ void CXFA_FM2JSContext::assign_value_operator(CFXJSE_Value* pThis,
     } else {
       for (int32_t i = 2; i < iLeftLength; i++) {
         lValue->GetObjectPropertyByIdx(i, jsObjectValue.get());
-        jsObjectValue->SetObjectProperty(propertyValue->ToString().AsStringC(),
-                                         rValue.get());
+        jsObjectValue->SetObjectProperty(
+            propertyValue->ToString().AsStringView(), rValue.get());
       }
     }
   } else if (lValue->IsObject()) {
@@ -4758,7 +4746,7 @@ void CXFA_FM2JSContext::assign_value_operator(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::logical_or_operator(CFXJSE_Value* pThis,
-                                            const CFX_ByteStringC& szFuncName,
+                                            const ByteStringView& szFuncName,
                                             CFXJSE_Arguments& args) {
   if (args.GetLength() != 2) {
     ToJSContext(pThis, nullptr)->ThrowCompilerErrorException();
@@ -4779,7 +4767,7 @@ void CXFA_FM2JSContext::logical_or_operator(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::logical_and_operator(CFXJSE_Value* pThis,
-                                             const CFX_ByteStringC& szFuncName,
+                                             const ByteStringView& szFuncName,
                                              CFXJSE_Arguments& args) {
   if (args.GetLength() != 2) {
     ToJSContext(pThis, nullptr)->ThrowCompilerErrorException();
@@ -4800,7 +4788,7 @@ void CXFA_FM2JSContext::logical_and_operator(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::equality_operator(CFXJSE_Value* pThis,
-                                          const CFX_ByteStringC& szFuncName,
+                                          const ByteStringView& szFuncName,
                                           CFXJSE_Arguments& args) {
   if (args.GetLength() != 2) {
     ToJSContext(pThis, nullptr)->ThrowCompilerErrorException();
@@ -4833,7 +4821,7 @@ void CXFA_FM2JSContext::equality_operator(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::notequality_operator(CFXJSE_Value* pThis,
-                                             const CFX_ByteStringC& szFuncName,
+                                             const ByteStringView& szFuncName,
                                              CFXJSE_Arguments& args) {
   if (args.GetLength() != 2) {
     ToJSContext(pThis, nullptr)->ThrowCompilerErrorException();
@@ -4893,7 +4881,7 @@ bool CXFA_FM2JSContext::fm_ref_equal(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::less_operator(CFXJSE_Value* pThis,
-                                      const CFX_ByteStringC& szFuncName,
+                                      const ByteStringView& szFuncName,
                                       CFXJSE_Arguments& args) {
   if (args.GetLength() != 2) {
     ToJSContext(pThis, nullptr)->ThrowCompilerErrorException();
@@ -4909,7 +4897,8 @@ void CXFA_FM2JSContext::less_operator(CFXJSE_Value* pThis,
 
   if (argFirst->IsString() && argSecond->IsString()) {
     args.GetReturnValue()->SetInteger(
-        argFirst->ToString().Compare(argSecond->ToString().AsStringC()) == -1);
+        argFirst->ToString().Compare(argSecond->ToString().AsStringView()) ==
+        -1);
     return;
   }
 
@@ -4920,7 +4909,7 @@ void CXFA_FM2JSContext::less_operator(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::lessequal_operator(CFXJSE_Value* pThis,
-                                           const CFX_ByteStringC& szFuncName,
+                                           const ByteStringView& szFuncName,
                                            CFXJSE_Arguments& args) {
   if (args.GetLength() != 2) {
     ToJSContext(pThis, nullptr)->ThrowCompilerErrorException();
@@ -4937,7 +4926,8 @@ void CXFA_FM2JSContext::lessequal_operator(CFXJSE_Value* pThis,
 
   if (argFirst->IsString() && argSecond->IsString()) {
     args.GetReturnValue()->SetInteger(
-        argFirst->ToString().Compare(argSecond->ToString().AsStringC()) != 1);
+        argFirst->ToString().Compare(argSecond->ToString().AsStringView()) !=
+        1);
     return;
   }
 
@@ -4948,7 +4938,7 @@ void CXFA_FM2JSContext::lessequal_operator(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::greater_operator(CFXJSE_Value* pThis,
-                                         const CFX_ByteStringC& szFuncName,
+                                         const ByteStringView& szFuncName,
                                          CFXJSE_Arguments& args) {
   if (args.GetLength() != 2) {
     ToJSContext(pThis, nullptr)->ThrowCompilerErrorException();
@@ -4964,7 +4954,8 @@ void CXFA_FM2JSContext::greater_operator(CFXJSE_Value* pThis,
 
   if (argFirst->IsString() && argSecond->IsString()) {
     args.GetReturnValue()->SetInteger(
-        argFirst->ToString().Compare(argSecond->ToString().AsStringC()) == 1);
+        argFirst->ToString().Compare(argSecond->ToString().AsStringView()) ==
+        1);
     return;
   }
 
@@ -4975,7 +4966,7 @@ void CXFA_FM2JSContext::greater_operator(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::greaterequal_operator(CFXJSE_Value* pThis,
-                                              const CFX_ByteStringC& szFuncName,
+                                              const ByteStringView& szFuncName,
                                               CFXJSE_Arguments& args) {
   if (args.GetLength() != 2) {
     ToJSContext(pThis, nullptr)->ThrowCompilerErrorException();
@@ -4992,7 +4983,8 @@ void CXFA_FM2JSContext::greaterequal_operator(CFXJSE_Value* pThis,
 
   if (argFirst->IsString() && argSecond->IsString()) {
     args.GetReturnValue()->SetInteger(
-        argFirst->ToString().Compare(argSecond->ToString().AsStringC()) != -1);
+        argFirst->ToString().Compare(argSecond->ToString().AsStringView()) !=
+        -1);
     return;
   }
 
@@ -5003,7 +4995,7 @@ void CXFA_FM2JSContext::greaterequal_operator(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::plus_operator(CFXJSE_Value* pThis,
-                                      const CFX_ByteStringC& szFuncName,
+                                      const ByteStringView& szFuncName,
                                       CFXJSE_Arguments& args) {
   if (args.GetLength() != 2) {
     ToJSContext(pThis, nullptr)->ThrowCompilerErrorException();
@@ -5025,7 +5017,7 @@ void CXFA_FM2JSContext::plus_operator(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::minus_operator(CFXJSE_Value* pThis,
-                                       const CFX_ByteStringC& szFuncName,
+                                       const ByteStringView& szFuncName,
                                        CFXJSE_Arguments& args) {
   if (args.GetLength() != 2) {
     ToJSContext(pThis, nullptr)->ThrowCompilerErrorException();
@@ -5046,7 +5038,7 @@ void CXFA_FM2JSContext::minus_operator(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::multiple_operator(CFXJSE_Value* pThis,
-                                          const CFX_ByteStringC& szFuncName,
+                                          const ByteStringView& szFuncName,
                                           CFXJSE_Arguments& args) {
   if (args.GetLength() != 2) {
     ToJSContext(pThis, nullptr)->ThrowCompilerErrorException();
@@ -5067,7 +5059,7 @@ void CXFA_FM2JSContext::multiple_operator(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::divide_operator(CFXJSE_Value* pThis,
-                                        const CFX_ByteStringC& szFuncName,
+                                        const ByteStringView& szFuncName,
                                         CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   if (args.GetLength() != 2) {
@@ -5094,7 +5086,7 @@ void CXFA_FM2JSContext::divide_operator(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::positive_operator(CFXJSE_Value* pThis,
-                                          const CFX_ByteStringC& szFuncName,
+                                          const ByteStringView& szFuncName,
                                           CFXJSE_Arguments& args) {
   if (args.GetLength() != 1) {
     ToJSContext(pThis, nullptr)->ThrowCompilerErrorException();
@@ -5111,7 +5103,7 @@ void CXFA_FM2JSContext::positive_operator(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::negative_operator(CFXJSE_Value* pThis,
-                                          const CFX_ByteStringC& szFuncName,
+                                          const ByteStringView& szFuncName,
                                           CFXJSE_Arguments& args) {
   if (args.GetLength() != 1) {
     ToJSContext(pThis, nullptr)->ThrowCompilerErrorException();
@@ -5128,7 +5120,7 @@ void CXFA_FM2JSContext::negative_operator(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::logical_not_operator(CFXJSE_Value* pThis,
-                                             const CFX_ByteStringC& szFuncName,
+                                             const ByteStringView& szFuncName,
                                              CFXJSE_Arguments& args) {
   if (args.GetLength() != 1) {
     ToJSContext(pThis, nullptr)->ThrowCompilerErrorException();
@@ -5147,7 +5139,7 @@ void CXFA_FM2JSContext::logical_not_operator(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::dot_accessor(CFXJSE_Value* pThis,
-                                     const CFX_ByteStringC& szFuncName,
+                                     const ByteStringView& szFuncName,
                                      CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   v8::Isolate* pIsolate = pContext->GetScriptRuntime();
@@ -5164,9 +5156,9 @@ void CXFA_FM2JSContext::dot_accessor(CFXJSE_Value* pThis,
     iIndexValue = ValueToInteger(pThis, args.GetValue(4).get());
   }
 
-  CFX_ByteString szName = args.GetUTF8String(2);
-  CFX_ByteString szSomExp = GenerateSomExpression(
-      szName.AsStringC(), args.GetInt32(3), iIndexValue, bIsStar);
+  ByteString szName = args.GetUTF8String(2);
+  ByteString szSomExp = GenerateSomExpression(
+      szName.AsStringView(), args.GetInt32(3), iIndexValue, bIsStar);
 
   std::unique_ptr<CFXJSE_Value> argAccessor = args.GetValue(0);
   if (argAccessor->IsArray()) {
@@ -5187,7 +5179,7 @@ void CXFA_FM2JSContext::dot_accessor(CFXJSE_Value* pThis,
       argAccessor->GetObjectPropertyByIdx(i, hJSObjValue.get());
 
       XFA_RESOLVENODE_RS resoveNodeRS;
-      if (ResolveObjects(pThis, hJSObjValue.get(), szSomExp.AsStringC(),
+      if (ResolveObjects(pThis, hJSObjValue.get(), szSomExp.AsStringView(),
                          resoveNodeRS, true, szName.IsEmpty()) > 0) {
         ParseResolveResult(pThis, resoveNodeRS, hJSObjValue.get(),
                            &resolveValues[i - 2], &bAttribute);
@@ -5196,8 +5188,8 @@ void CXFA_FM2JSContext::dot_accessor(CFXJSE_Value* pThis,
     }
     if (iCounter < 1) {
       pContext->ThrowPropertyNotInObjectException(
-          CFX_WideString::FromUTF8(szName.AsStringC()),
-          CFX_WideString::FromUTF8(szSomExp.AsStringC()));
+          WideString::FromUTF8(szName.AsStringView()),
+          WideString::FromUTF8(szSomExp.AsStringView()));
       return;
     }
 
@@ -5207,7 +5199,7 @@ void CXFA_FM2JSContext::dot_accessor(CFXJSE_Value* pThis,
 
     values[0]->SetInteger(1);
     if (bAttribute)
-      values[1]->SetString(szName.AsStringC());
+      values[1]->SetString(szName.AsStringView());
     else
       values[1]->SetNull();
 
@@ -5224,21 +5216,21 @@ void CXFA_FM2JSContext::dot_accessor(CFXJSE_Value* pThis,
 
   XFA_RESOLVENODE_RS resoveNodeRS;
   int32_t iRet = 0;
-  CFX_ByteString bsAccessorName = args.GetUTF8String(1);
+  ByteString bsAccessorName = args.GetUTF8String(1);
   if (argAccessor->IsObject() ||
       (argAccessor->IsNull() && bsAccessorName.IsEmpty())) {
-    iRet = ResolveObjects(pThis, argAccessor.get(), szSomExp.AsStringC(),
+    iRet = ResolveObjects(pThis, argAccessor.get(), szSomExp.AsStringView(),
                           resoveNodeRS, true, szName.IsEmpty());
   } else if (!argAccessor->IsObject() && !bsAccessorName.IsEmpty() &&
              GetObjectForName(pThis, argAccessor.get(),
-                              bsAccessorName.AsStringC())) {
-    iRet = ResolveObjects(pThis, argAccessor.get(), szSomExp.AsStringC(),
+                              bsAccessorName.AsStringView())) {
+    iRet = ResolveObjects(pThis, argAccessor.get(), szSomExp.AsStringView(),
                           resoveNodeRS, true, szName.IsEmpty());
   }
   if (iRet < 1) {
     pContext->ThrowPropertyNotInObjectException(
-        CFX_WideString::FromUTF8(szName.AsStringC()),
-        CFX_WideString::FromUTF8(szSomExp.AsStringC()));
+        WideString::FromUTF8(szName.AsStringView()),
+        WideString::FromUTF8(szSomExp.AsStringView()));
     return;
   }
 
@@ -5253,7 +5245,7 @@ void CXFA_FM2JSContext::dot_accessor(CFXJSE_Value* pThis,
 
   values[0]->SetInteger(1);
   if (bAttribute)
-    values[1]->SetString(szName.AsStringC());
+    values[1]->SetString(szName.AsStringView());
   else
     values[1]->SetNull();
 
@@ -5265,7 +5257,7 @@ void CXFA_FM2JSContext::dot_accessor(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::dotdot_accessor(CFXJSE_Value* pThis,
-                                        const CFX_ByteStringC& szFuncName,
+                                        const ByteStringView& szFuncName,
                                         CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   v8::Isolate* pIsolate = pContext->GetScriptRuntime();
@@ -5282,9 +5274,9 @@ void CXFA_FM2JSContext::dotdot_accessor(CFXJSE_Value* pThis,
     iIndexValue = ValueToInteger(pThis, args.GetValue(4).get());
   }
 
-  CFX_ByteString szName = args.GetUTF8String(2);
-  CFX_ByteString szSomExp = GenerateSomExpression(
-      szName.AsStringC(), args.GetInt32(3), iIndexValue, bIsStar);
+  ByteString szName = args.GetUTF8String(2);
+  ByteString szSomExp = GenerateSomExpression(
+      szName.AsStringView(), args.GetInt32(3), iIndexValue, bIsStar);
 
   std::unique_ptr<CFXJSE_Value> argAccessor = args.GetValue(0);
   if (argAccessor->IsArray()) {
@@ -5305,7 +5297,7 @@ void CXFA_FM2JSContext::dotdot_accessor(CFXJSE_Value* pThis,
     for (int32_t i = 2; i < iLength; i++) {
       argAccessor->GetObjectPropertyByIdx(i, hJSObjValue.get());
       XFA_RESOLVENODE_RS resoveNodeRS;
-      if (ResolveObjects(pThis, hJSObjValue.get(), szSomExp.AsStringC(),
+      if (ResolveObjects(pThis, hJSObjValue.get(), szSomExp.AsStringView(),
                          resoveNodeRS, false) > 0) {
         ParseResolveResult(pThis, resoveNodeRS, hJSObjValue.get(),
                            &resolveValues[i - 2], &bAttribute);
@@ -5314,8 +5306,8 @@ void CXFA_FM2JSContext::dotdot_accessor(CFXJSE_Value* pThis,
     }
     if (iCounter < 1) {
       pContext->ThrowPropertyNotInObjectException(
-          CFX_WideString::FromUTF8(szName.AsStringC()),
-          CFX_WideString::FromUTF8(szSomExp.AsStringC()));
+          WideString::FromUTF8(szName.AsStringView()),
+          WideString::FromUTF8(szSomExp.AsStringView()));
       return;
     }
 
@@ -5325,7 +5317,7 @@ void CXFA_FM2JSContext::dotdot_accessor(CFXJSE_Value* pThis,
 
     values[0]->SetInteger(1);
     if (bAttribute)
-      values[1]->SetString(szName.AsStringC());
+      values[1]->SetString(szName.AsStringView());
     else
       values[1]->SetNull();
 
@@ -5342,21 +5334,21 @@ void CXFA_FM2JSContext::dotdot_accessor(CFXJSE_Value* pThis,
 
   XFA_RESOLVENODE_RS resoveNodeRS;
   int32_t iRet = 0;
-  CFX_ByteString bsAccessorName = args.GetUTF8String(1);
+  ByteString bsAccessorName = args.GetUTF8String(1);
   if (argAccessor->IsObject() ||
       (argAccessor->IsNull() && bsAccessorName.IsEmpty())) {
-    iRet = ResolveObjects(pThis, argAccessor.get(), szSomExp.AsStringC(),
+    iRet = ResolveObjects(pThis, argAccessor.get(), szSomExp.AsStringView(),
                           resoveNodeRS, false);
   } else if (!argAccessor->IsObject() && !bsAccessorName.IsEmpty() &&
              GetObjectForName(pThis, argAccessor.get(),
-                              bsAccessorName.AsStringC())) {
-    iRet = ResolveObjects(pThis, argAccessor.get(), szSomExp.AsStringC(),
+                              bsAccessorName.AsStringView())) {
+    iRet = ResolveObjects(pThis, argAccessor.get(), szSomExp.AsStringView(),
                           resoveNodeRS, false);
   }
   if (iRet < 1) {
     pContext->ThrowPropertyNotInObjectException(
-        CFX_WideString::FromUTF8(szName.AsStringC()),
-        CFX_WideString::FromUTF8(szSomExp.AsStringC()));
+        WideString::FromUTF8(szName.AsStringView()),
+        WideString::FromUTF8(szSomExp.AsStringView()));
     return;
   }
 
@@ -5371,7 +5363,7 @@ void CXFA_FM2JSContext::dotdot_accessor(CFXJSE_Value* pThis,
 
   values[0]->SetInteger(1);
   if (bAttribute)
-    values[1]->SetString(szName.AsStringC());
+    values[1]->SetString(szName.AsStringView());
   else
     values[1]->SetNull();
 
@@ -5383,7 +5375,7 @@ void CXFA_FM2JSContext::dotdot_accessor(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::eval_translation(CFXJSE_Value* pThis,
-                                         const CFX_ByteStringC& szFuncName,
+                                         const ByteStringView& szFuncName,
                                          CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   if (args.GetLength() != 1) {
@@ -5392,27 +5384,27 @@ void CXFA_FM2JSContext::eval_translation(CFXJSE_Value* pThis,
   }
 
   std::unique_ptr<CFXJSE_Value> argOne = GetSimpleValue(pThis, args, 0);
-  CFX_ByteString argString = ValueToUTF8String(argOne.get());
+  ByteString argString = ValueToUTF8String(argOne.get());
   if (argString.IsEmpty()) {
     pContext->ThrowArgumentMismatchException();
     return;
   }
 
-  CFX_WideString scriptString = CFX_WideString::FromUTF8(argString.AsStringC());
+  WideString scriptString = WideString::FromUTF8(argString.AsStringView());
   CFX_WideTextBuf wsJavaScriptBuf;
-  if (!CXFA_FM2JSContext::Translate(scriptString.AsStringC(),
+  if (!CXFA_FM2JSContext::Translate(scriptString.AsStringView(),
                                     &wsJavaScriptBuf)) {
     pContext->ThrowCompilerErrorException();
     return;
   }
 
   args.GetReturnValue()->SetString(
-      FX_UTF8Encode(wsJavaScriptBuf.AsStringC()).AsStringC());
+      FX_UTF8Encode(wsJavaScriptBuf.AsStringView()).AsStringView());
 }
 
 // static
 void CXFA_FM2JSContext::is_fm_object(CFXJSE_Value* pThis,
-                                     const CFX_ByteStringC& szFuncName,
+                                     const ByteStringView& szFuncName,
                                      CFXJSE_Arguments& args) {
   if (args.GetLength() != 1) {
     args.GetReturnValue()->SetBoolean(false);
@@ -5425,7 +5417,7 @@ void CXFA_FM2JSContext::is_fm_object(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::is_fm_array(CFXJSE_Value* pThis,
-                                    const CFX_ByteStringC& szFuncName,
+                                    const ByteStringView& szFuncName,
                                     CFXJSE_Arguments& args) {
   if (args.GetLength() != 1) {
     args.GetReturnValue()->SetBoolean(false);
@@ -5438,7 +5430,7 @@ void CXFA_FM2JSContext::is_fm_array(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::get_fm_value(CFXJSE_Value* pThis,
-                                     const CFX_ByteStringC& szFuncName,
+                                     const ByteStringView& szFuncName,
                                      CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   if (args.GetLength() != 1) {
@@ -5458,7 +5450,7 @@ void CXFA_FM2JSContext::get_fm_value(CFXJSE_Value* pThis,
       return;
     }
 
-    jsObjectValue->GetObjectProperty(propertyValue->ToString().AsStringC(),
+    jsObjectValue->GetObjectProperty(propertyValue->ToString().AsStringView(),
                                      args.GetReturnValue());
     return;
   }
@@ -5473,7 +5465,7 @@ void CXFA_FM2JSContext::get_fm_value(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::get_fm_jsobj(CFXJSE_Value* pThis,
-                                     const CFX_ByteStringC& szFuncName,
+                                     const ByteStringView& szFuncName,
                                      CFXJSE_Arguments& args) {
   if (args.GetLength() != 1) {
     ToJSContext(pThis, nullptr)->ThrowCompilerErrorException();
@@ -5499,7 +5491,7 @@ void CXFA_FM2JSContext::get_fm_jsobj(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::fm_var_filter(CFXJSE_Value* pThis,
-                                      const CFX_ByteStringC& szFuncName,
+                                      const ByteStringView& szFuncName,
                                       CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   if (args.GetLength() != 1) {
@@ -5553,7 +5545,7 @@ void CXFA_FM2JSContext::fm_var_filter(CFXJSE_Value* pThis,
 
 // static
 void CXFA_FM2JSContext::concat_fm_object(CFXJSE_Value* pThis,
-                                         const CFX_ByteStringC& szFuncName,
+                                         const ByteStringView& szFuncName,
                                          CFXJSE_Arguments& args) {
   v8::Isolate* pIsolate = ToJSContext(pThis, nullptr)->GetScriptRuntime();
   uint32_t iLength = 0;
@@ -5623,7 +5615,7 @@ std::unique_ptr<CFXJSE_Value> CXFA_FM2JSContext::GetSimpleValue(
       return simpleValue;
     }
 
-    jsObjectValue->GetObjectProperty(propertyValue->ToString().AsStringC(),
+    jsObjectValue->GetObjectProperty(propertyValue->ToString().AsStringView(),
                                      simpleValue.get());
     return simpleValue;
   }
@@ -5658,7 +5650,7 @@ bool CXFA_FM2JSContext::ValueIsNull(CFXJSE_Value* pThis, CFXJSE_Value* arg) {
     }
 
     auto newPropertyValue = pdfium::MakeUnique<CFXJSE_Value>(pIsolate);
-    jsObjectValue->GetObjectProperty(propertyValue->ToString().AsStringC(),
+    jsObjectValue->GetObjectProperty(propertyValue->ToString().AsStringView(),
                                      newPropertyValue.get());
     return newPropertyValue->IsNull();
   }
@@ -5688,8 +5680,8 @@ bool CXFA_FM2JSContext::simpleValueCompare(CFXJSE_Value* pThis,
     return false;
 
   if (firstValue->IsString()) {
-    CFX_ByteString firstString = ValueToUTF8String(firstValue);
-    CFX_ByteString secondString = ValueToUTF8String(secondValue);
+    ByteString firstString = ValueToUTF8String(firstValue);
+    ByteString secondString = ValueToUTF8String(secondValue);
     return firstString == secondString;
   }
   if (firstValue->IsNumber()) {
@@ -5753,7 +5745,7 @@ void CXFA_FM2JSContext::unfoldArgs(
         for (int32_t j = 2; j < iLength; j++) {
           argsValue[i]->GetObjectPropertyByIdx(j, jsObjectValue.get());
           jsObjectValue->GetObjectProperty(
-              propertyValue->ToString().AsStringC(),
+              propertyValue->ToString().AsStringView(),
               (*resultValues)[index].get());
           index++;
         }
@@ -5791,41 +5783,40 @@ bool CXFA_FM2JSContext::SetObjectDefaultValue(CFXJSE_Value* pValue,
 }
 
 // static
-CFX_ByteString CXFA_FM2JSContext::GenerateSomExpression(
-    const CFX_ByteStringC& szName,
+ByteString CXFA_FM2JSContext::GenerateSomExpression(
+    const ByteStringView& szName,
     int32_t iIndexFlags,
     int32_t iIndexValue,
     bool bIsStar) {
   if (bIsStar)
-    return CFX_ByteString(szName, "[*]");
+    return ByteString(szName, "[*]");
 
   if (iIndexFlags == 0)
-    return CFX_ByteString(szName);
+    return ByteString(szName);
 
   if (iIndexFlags == 1 || iIndexValue == 0) {
-    return CFX_ByteString(szName, "[") +
-           CFX_ByteString::FormatInteger(iIndexValue) + "]";
+    return ByteString(szName, "[") + ByteString::FormatInteger(iIndexValue) +
+           "]";
   }
-  CFX_ByteString szSomExp;
+  ByteString szSomExp;
   if (iIndexFlags == 2) {
     szSomExp = (iIndexValue < 0) ? (szName + "[-") : (szName + "[+");
     iIndexValue = (iIndexValue < 0) ? (0 - iIndexValue) : iIndexValue;
-    szSomExp += CFX_ByteString::FormatInteger(iIndexValue);
+    szSomExp += ByteString::FormatInteger(iIndexValue);
     szSomExp += "]";
   } else {
     szSomExp = (iIndexValue < 0) ? (szName + "[") : (szName + "[-");
     iIndexValue = (iIndexValue < 0) ? (0 - iIndexValue) : iIndexValue;
-    szSomExp += CFX_ByteString::FormatInteger(iIndexValue);
+    szSomExp += ByteString::FormatInteger(iIndexValue);
     szSomExp += "]";
   }
   return szSomExp;
 }
 
 // static
-bool CXFA_FM2JSContext::GetObjectForName(
-    CFXJSE_Value* pThis,
-    CFXJSE_Value* accessorValue,
-    const CFX_ByteStringC& szAccessorName) {
+bool CXFA_FM2JSContext::GetObjectForName(CFXJSE_Value* pThis,
+                                         CFXJSE_Value* accessorValue,
+                                         const ByteStringView& szAccessorName) {
   CXFA_Document* pDoc = ToJSContext(pThis, nullptr)->GetDocument();
   if (!pDoc)
     return false;
@@ -5836,7 +5827,7 @@ bool CXFA_FM2JSContext::GetObjectForName(
                      XFA_RESOLVENODE_Siblings | XFA_RESOLVENODE_Parent;
   int32_t iRet = pScriptContext->ResolveObjects(
       pScriptContext->GetThisObject(),
-      CFX_WideString::FromUTF8(szAccessorName).AsStringC(), resoveNodeRS,
+      WideString::FromUTF8(szAccessorName).AsStringView(), resoveNodeRS,
       dwFlags);
   if (iRet >= 1 && resoveNodeRS.dwFlags == XFA_RESOVENODE_RSTYPE_Nodes) {
     accessorValue->Assign(
@@ -5849,7 +5840,7 @@ bool CXFA_FM2JSContext::GetObjectForName(
 // static
 int32_t CXFA_FM2JSContext::ResolveObjects(CFXJSE_Value* pThis,
                                           CFXJSE_Value* pRefValue,
-                                          const CFX_ByteStringC& bsSomExp,
+                                          const ByteStringView& bsSomExp,
                                           XFA_RESOLVENODE_RS& resoveNodeRS,
                                           bool bdotAccessor,
                                           bool bHasNoResolveName) {
@@ -5857,7 +5848,7 @@ int32_t CXFA_FM2JSContext::ResolveObjects(CFXJSE_Value* pThis,
   if (!pDoc)
     return -1;
 
-  CFX_WideString wsSomExpression = CFX_WideString::FromUTF8(bsSomExp);
+  WideString wsSomExpression = WideString::FromUTF8(bsSomExp);
   CXFA_ScriptContext* pScriptContext = pDoc->GetScriptContext();
   CXFA_Object* pNode = nullptr;
   uint32_t dFlags = 0UL;
@@ -5869,7 +5860,7 @@ int32_t CXFA_FM2JSContext::ResolveObjects(CFXJSE_Value* pThis,
       pNode = CXFA_ScriptContext::ToObject(pRefValue, nullptr);
       ASSERT(pNode);
       if (bHasNoResolveName) {
-        CFX_WideString wsName;
+        WideString wsName;
         if (CXFA_Node* pXFANode = pNode->AsNode())
           pXFANode->GetAttribute(XFA_ATTRIBUTE_Name, wsName, false);
         if (wsName.IsEmpty())
@@ -5888,7 +5879,7 @@ int32_t CXFA_FM2JSContext::ResolveObjects(CFXJSE_Value* pThis,
     pNode = CXFA_ScriptContext::ToObject(pRefValue, nullptr);
     dFlags = XFA_RESOLVENODE_AnyChild;
   }
-  return pScriptContext->ResolveObjects(pNode, wsSomExpression.AsStringC(),
+  return pScriptContext->ResolveObjects(pNode, wsSomExpression.AsStringView(),
                                         resoveNodeRS, dFlags);
 }
 
@@ -5954,7 +5945,7 @@ int32_t CXFA_FM2JSContext::ValueToInteger(CFXJSE_Value* pThis,
       return ValueToInteger(pThis, newPropertyValue.get());
     }
 
-    jsObjectValue->GetObjectProperty(propertyValue->ToString().AsStringC(),
+    jsObjectValue->GetObjectProperty(propertyValue->ToString().AsStringView(),
                                      newPropertyValue.get());
     return ValueToInteger(pThis, newPropertyValue.get());
   }
@@ -5984,7 +5975,7 @@ float CXFA_FM2JSContext::ValueToFloat(CFXJSE_Value* pThis, CFXJSE_Value* arg) {
       GetObjectDefaultValue(jsObjectValue.get(), newPropertyValue.get());
       return ValueToFloat(pThis, newPropertyValue.get());
     }
-    jsObjectValue->GetObjectProperty(propertyValue->ToString().AsStringC(),
+    jsObjectValue->GetObjectProperty(propertyValue->ToString().AsStringView(),
                                      newPropertyValue.get());
     return ValueToFloat(pThis, newPropertyValue.get());
   }
@@ -5994,7 +5985,7 @@ float CXFA_FM2JSContext::ValueToFloat(CFXJSE_Value* pThis, CFXJSE_Value* arg) {
     return ValueToFloat(pThis, newPropertyValue.get());
   }
   if (arg->IsString())
-    return (float)XFA_ByteStringToDouble(arg->ToString().AsStringC());
+    return (float)XFA_ByteStringToDouble(arg->ToString().AsStringView());
   if (arg->IsUndefined())
     return 0;
 
@@ -6018,7 +6009,7 @@ double CXFA_FM2JSContext::ValueToDouble(CFXJSE_Value* pThis,
       GetObjectDefaultValue(jsObjectValue.get(), newPropertyValue.get());
       return ValueToDouble(pThis, newPropertyValue.get());
     }
-    jsObjectValue->GetObjectProperty(propertyValue->ToString().AsStringC(),
+    jsObjectValue->GetObjectProperty(propertyValue->ToString().AsStringView(),
                                      newPropertyValue.get());
     return ValueToDouble(pThis, newPropertyValue.get());
   }
@@ -6028,7 +6019,7 @@ double CXFA_FM2JSContext::ValueToDouble(CFXJSE_Value* pThis,
     return ValueToDouble(pThis, newPropertyValue.get());
   }
   if (arg->IsString())
-    return XFA_ByteStringToDouble(arg->ToString().AsStringC());
+    return XFA_ByteStringToDouble(arg->ToString().AsStringView());
   if (arg->IsUndefined())
     return 0;
   return arg->ToDouble();
@@ -6064,22 +6055,22 @@ double CXFA_FM2JSContext::ExtractDouble(CFXJSE_Value* pThis,
     return ValueToDouble(pThis, jsObjectValue.get());
 
   auto newPropertyValue = pdfium::MakeUnique<CFXJSE_Value>(pIsolate);
-  jsObjectValue->GetObjectProperty(propertyValue->ToString().AsStringC(),
+  jsObjectValue->GetObjectProperty(propertyValue->ToString().AsStringView(),
                                    newPropertyValue.get());
   return ValueToDouble(pThis, newPropertyValue.get());
 }
 
 // static
-CFX_ByteString CXFA_FM2JSContext::ValueToUTF8String(CFXJSE_Value* arg) {
+ByteString CXFA_FM2JSContext::ValueToUTF8String(CFXJSE_Value* arg) {
   if (!arg || arg->IsNull() || arg->IsUndefined())
-    return CFX_ByteString();
+    return ByteString();
   if (arg->IsBoolean())
     return arg->ToBoolean() ? "1" : "0";
   return arg->ToString();
 }
 
 // static.
-bool CXFA_FM2JSContext::Translate(const CFX_WideStringC& wsFormcalc,
+bool CXFA_FM2JSContext::Translate(const WideStringView& wsFormcalc,
                                   CFX_WideTextBuf* wsJavascript) {
   if (wsFormcalc.IsEmpty()) {
     wsJavascript->Clear();
@@ -6118,7 +6109,7 @@ void CXFA_FM2JSContext::GlobalPropertyGetter(CFXJSE_Value* pValue) {
 }
 
 void CXFA_FM2JSContext::ThrowNoDefaultPropertyException(
-    const CFX_ByteStringC& name) const {
+    const ByteStringView& name) const {
   // TODO(tsepez): check usage of c_str() below.
   ThrowException(L"%.16S doesn't have a default property.",
                  name.unterminated_c_str());
@@ -6137,8 +6128,8 @@ void CXFA_FM2JSContext::ThrowServerDeniedException() const {
 }
 
 void CXFA_FM2JSContext::ThrowPropertyNotInObjectException(
-    const CFX_WideString& name,
-    const CFX_WideString& exp) const {
+    const WideString& name,
+    const WideString& exp) const {
   ThrowException(
       L"An attempt was made to reference property '%.16s' of a non-object "
       L"in SOM expression %.16s.",
@@ -6146,7 +6137,7 @@ void CXFA_FM2JSContext::ThrowPropertyNotInObjectException(
 }
 
 void CXFA_FM2JSContext::ThrowParamCountMismatchException(
-    const CFX_WideString& method) const {
+    const WideString& method) const {
   ThrowException(L"Incorrect number of parameters calling method '%.16s'.",
                  method.c_str());
 }
@@ -6156,11 +6147,11 @@ void CXFA_FM2JSContext::ThrowArgumentMismatchException() const {
 }
 
 void CXFA_FM2JSContext::ThrowException(const wchar_t* str, ...) const {
-  CFX_WideString wsMessage;
+  WideString wsMessage;
   va_list arg_ptr;
   va_start(arg_ptr, str);
   wsMessage.FormatV(str, arg_ptr);
   va_end(arg_ptr);
   ASSERT(!wsMessage.IsEmpty());
-  FXJSE_ThrowMessage(wsMessage.UTF8Encode().AsStringC());
+  FXJSE_ThrowMessage(wsMessage.UTF8Encode().AsStringView());
 }
diff --git a/xfa/fxfa/fm2js/cxfa_fm2jscontext.h b/xfa/fxfa/fm2js/cxfa_fm2jscontext.h
index 37586d080e..ca52ea8271 100644
--- a/xfa/fxfa/fm2js/cxfa_fm2jscontext.h
+++ b/xfa/fxfa/fm2js/cxfa_fm2jscontext.h
@@ -25,73 +25,73 @@ class CXFA_FM2JSContext : public CFXJSE_HostObject {
   ~CXFA_FM2JSContext() override;
 
   static void Abs(CFXJSE_Value* pThis,
-                  const CFX_ByteStringC& szFuncName,
+                  const ByteStringView& szFuncName,
                   CFXJSE_Arguments& args);
   static void Avg(CFXJSE_Value* pThis,
-                  const CFX_ByteStringC& szFuncName,
+                  const ByteStringView& szFuncName,
                   CFXJSE_Arguments& args);
   static void Ceil(CFXJSE_Value* pThis,
-                   const CFX_ByteStringC& szFuncName,
+                   const ByteStringView& szFuncName,
                    CFXJSE_Arguments& args);
   static void Count(CFXJSE_Value* pThis,
-                    const CFX_ByteStringC& szFuncName,
+                    const ByteStringView& szFuncName,
                     CFXJSE_Arguments& args);
   static void Floor(CFXJSE_Value* pThis,
-                    const CFX_ByteStringC& szFuncName,
+                    const ByteStringView& szFuncName,
                     CFXJSE_Arguments& args);
   static void Max(CFXJSE_Value* pThis,
-                  const CFX_ByteStringC& szFuncName,
+                  const ByteStringView& szFuncName,
                   CFXJSE_Arguments& args);
   static void Min(CFXJSE_Value* pThis,
-                  const CFX_ByteStringC& szFuncName,
+                  const ByteStringView& szFuncName,
                   CFXJSE_Arguments& args);
   static void Mod(CFXJSE_Value* pThis,
-                  const CFX_ByteStringC& szFuncName,
+                  const ByteStringView& szFuncName,
                   CFXJSE_Arguments& args);
   static void Round(CFXJSE_Value* pThis,
-                    const CFX_ByteStringC& szFuncName,
+                    const ByteStringView& szFuncName,
                     CFXJSE_Arguments& args);
   static void Sum(CFXJSE_Value* pThis,
-                  const CFX_ByteStringC& szFuncName,
+                  const ByteStringView& szFuncName,
                   CFXJSE_Arguments& args);
   static void Date(CFXJSE_Value* pThis,
-                   const CFX_ByteStringC& szFuncName,
+                   const ByteStringView& szFuncName,
                    CFXJSE_Arguments& args);
   static void Date2Num(CFXJSE_Value* pThis,
-                       const CFX_ByteStringC& szFuncName,
+                       const ByteStringView& szFuncName,
                        CFXJSE_Arguments& args);
   static void DateFmt(CFXJSE_Value* pThis,
-                      const CFX_ByteStringC& szFuncName,
+                      const ByteStringView& szFuncName,
                       CFXJSE_Arguments& args);
   static void IsoDate2Num(CFXJSE_Value* pThis,
-                          const CFX_ByteStringC& szFuncName,
+                          const ByteStringView& szFuncName,
                           CFXJSE_Arguments& args);
   static void IsoTime2Num(CFXJSE_Value* pThis,
-                          const CFX_ByteStringC& szFuncName,
+                          const ByteStringView& szFuncName,
                           CFXJSE_Arguments& args);
   static void LocalDateFmt(CFXJSE_Value* pThis,
-                           const CFX_ByteStringC& szFuncName,
+                           const ByteStringView& szFuncName,
                            CFXJSE_Arguments& args);
   static void LocalTimeFmt(CFXJSE_Value* pThis,
-                           const CFX_ByteStringC& szFuncName,
+                           const ByteStringView& szFuncName,
                            CFXJSE_Arguments& args);
   static void Num2Date(CFXJSE_Value* pThis,
-                       const CFX_ByteStringC& szFuncName,
+                       const ByteStringView& szFuncName,
                        CFXJSE_Arguments& args);
   static void Num2GMTime(CFXJSE_Value* pThis,
-                         const CFX_ByteStringC& szFuncName,
+                         const ByteStringView& szFuncName,
                          CFXJSE_Arguments& args);
   static void Num2Time(CFXJSE_Value* pThis,
-                       const CFX_ByteStringC& szFuncName,
+                       const ByteStringView& szFuncName,
                        CFXJSE_Arguments& args);
   static void Time(CFXJSE_Value* pThis,
-                   const CFX_ByteStringC& szFuncName,
+                   const ByteStringView& szFuncName,
                    CFXJSE_Arguments& args);
   static void Time2Num(CFXJSE_Value* pThis,
-                       const CFX_ByteStringC& szFuncName,
+                       const ByteStringView& szFuncName,
                        CFXJSE_Arguments& args);
   static void TimeFmt(CFXJSE_Value* pThis,
-                      const CFX_ByteStringC& szFuncName,
+                      const ByteStringView& szFuncName,
                       CFXJSE_Arguments& args);
 
   static bool IsIsoDateFormat(const char* pData,
@@ -119,258 +119,256 @@ class CXFA_FM2JSContext : public CFXJSE_HostObject {
                                   int32_t& iMillionSecond,
                                   int32_t& iZoneHour,
                                   int32_t& iZoneMinute);
-  static CFX_ByteString Local2IsoDate(CFXJSE_Value* pThis,
-                                      const CFX_ByteStringC& szDate,
-                                      const CFX_ByteStringC& szFormat,
-                                      const CFX_ByteStringC& szLocale);
-  static CFX_ByteString IsoDate2Local(CFXJSE_Value* pThis,
-                                      const CFX_ByteStringC& szDate,
-                                      const CFX_ByteStringC& szFormat,
-                                      const CFX_ByteStringC& szLocale);
-  static CFX_ByteString IsoTime2Local(CFXJSE_Value* pThis,
-                                      const CFX_ByteStringC& szTime,
-                                      const CFX_ByteStringC& szFormat,
-                                      const CFX_ByteStringC& szLocale);
-  static int32_t DateString2Num(const CFX_ByteStringC& szDateString);
-  static CFX_ByteString GetLocalDateFormat(CFXJSE_Value* pThis,
-                                           int32_t iStyle,
-                                           const CFX_ByteStringC& szLocalStr,
-                                           bool bStandard);
-  static CFX_ByteString GetLocalTimeFormat(CFXJSE_Value* pThis,
-                                           int32_t iStyle,
-                                           const CFX_ByteStringC& szLocalStr,
-                                           bool bStandard);
-  static CFX_ByteString GetStandardDateFormat(
-      CFXJSE_Value* pThis,
-      int32_t iStyle,
-      const CFX_ByteStringC& szLocalStr);
-  static CFX_ByteString GetStandardTimeFormat(
-      CFXJSE_Value* pThis,
-      int32_t iStyle,
-      const CFX_ByteStringC& szLocalStr);
-  static CFX_ByteString Num2AllTime(CFXJSE_Value* pThis,
-                                    int32_t iTime,
-                                    const CFX_ByteStringC& szFormat,
-                                    const CFX_ByteStringC& szLocale,
-                                    bool bGM);
+  static ByteString Local2IsoDate(CFXJSE_Value* pThis,
+                                  const ByteStringView& szDate,
+                                  const ByteStringView& szFormat,
+                                  const ByteStringView& szLocale);
+  static ByteString IsoDate2Local(CFXJSE_Value* pThis,
+                                  const ByteStringView& szDate,
+                                  const ByteStringView& szFormat,
+                                  const ByteStringView& szLocale);
+  static ByteString IsoTime2Local(CFXJSE_Value* pThis,
+                                  const ByteStringView& szTime,
+                                  const ByteStringView& szFormat,
+                                  const ByteStringView& szLocale);
+  static int32_t DateString2Num(const ByteStringView& szDateString);
+  static ByteString GetLocalDateFormat(CFXJSE_Value* pThis,
+                                       int32_t iStyle,
+                                       const ByteStringView& szLocalStr,
+                                       bool bStandard);
+  static ByteString GetLocalTimeFormat(CFXJSE_Value* pThis,
+                                       int32_t iStyle,
+                                       const ByteStringView& szLocalStr,
+                                       bool bStandard);
+  static ByteString GetStandardDateFormat(CFXJSE_Value* pThis,
+                                          int32_t iStyle,
+                                          const ByteStringView& szLocalStr);
+  static ByteString GetStandardTimeFormat(CFXJSE_Value* pThis,
+                                          int32_t iStyle,
+                                          const ByteStringView& szLocalStr);
+  static ByteString Num2AllTime(CFXJSE_Value* pThis,
+                                int32_t iTime,
+                                const ByteStringView& szFormat,
+                                const ByteStringView& szLocale,
+                                bool bGM);
   static void GetLocalTimeZone(int32_t& iHour, int32_t& iMin, int32_t& iSec);
 
   static void Apr(CFXJSE_Value* pThis,
-                  const CFX_ByteStringC& szFuncName,
+                  const ByteStringView& szFuncName,
                   CFXJSE_Arguments& args);
   static void CTerm(CFXJSE_Value* pThis,
-                    const CFX_ByteStringC& szFuncName,
+                    const ByteStringView& szFuncName,
                     CFXJSE_Arguments& args);
   static void FV(CFXJSE_Value* pThis,
-                 const CFX_ByteStringC& szFuncName,
+                 const ByteStringView& szFuncName,
                  CFXJSE_Arguments& args);
   static void IPmt(CFXJSE_Value* pThis,
-                   const CFX_ByteStringC& szFuncName,
+                   const ByteStringView& szFuncName,
                    CFXJSE_Arguments& args);
   static void NPV(CFXJSE_Value* pThis,
-                  const CFX_ByteStringC& szFuncName,
+                  const ByteStringView& szFuncName,
                   CFXJSE_Arguments& args);
   static void Pmt(CFXJSE_Value* pThis,
-                  const CFX_ByteStringC& szFuncName,
+                  const ByteStringView& szFuncName,
                   CFXJSE_Arguments& args);
   static void PPmt(CFXJSE_Value* pThis,
-                   const CFX_ByteStringC& szFuncName,
+                   const ByteStringView& szFuncName,
                    CFXJSE_Arguments& args);
   static void PV(CFXJSE_Value* pThis,
-                 const CFX_ByteStringC& szFuncName,
+                 const ByteStringView& szFuncName,
                  CFXJSE_Arguments& args);
   static void Rate(CFXJSE_Value* pThis,
-                   const CFX_ByteStringC& szFuncName,
+                   const ByteStringView& szFuncName,
                    CFXJSE_Arguments& args);
   static void Term(CFXJSE_Value* pThis,
-                   const CFX_ByteStringC& szFuncName,
+                   const ByteStringView& szFuncName,
                    CFXJSE_Arguments& args);
   static void Choose(CFXJSE_Value* pThis,
-                     const CFX_ByteStringC& szFuncName,
+                     const ByteStringView& szFuncName,
                      CFXJSE_Arguments& args);
   static void Exists(CFXJSE_Value* pThis,
-                     const CFX_ByteStringC& szFuncName,
+                     const ByteStringView& szFuncName,
                      CFXJSE_Arguments& args);
   static void HasValue(CFXJSE_Value* pThis,
-                       const CFX_ByteStringC& szFuncName,
+                       const ByteStringView& szFuncName,
                        CFXJSE_Arguments& args);
   static void Oneof(CFXJSE_Value* pThis,
-                    const CFX_ByteStringC& szFuncName,
+                    const ByteStringView& szFuncName,
                     CFXJSE_Arguments& args);
   static void Within(CFXJSE_Value* pThis,
-                     const CFX_ByteStringC& szFuncName,
+                     const ByteStringView& szFuncName,
                      CFXJSE_Arguments& args);
   static void If(CFXJSE_Value* pThis,
-                 const CFX_ByteStringC& szFuncName,
+                 const ByteStringView& szFuncName,
                  CFXJSE_Arguments& args);
   static void Eval(CFXJSE_Value* pThis,
-                   const CFX_ByteStringC& szFuncName,
+                   const ByteStringView& szFuncName,
                    CFXJSE_Arguments& args);
   static void Ref(CFXJSE_Value* pThis,
-                  const CFX_ByteStringC& szFuncName,
+                  const ByteStringView& szFuncName,
                   CFXJSE_Arguments& args);
   static void UnitType(CFXJSE_Value* pThis,
-                       const CFX_ByteStringC& szFuncName,
+                       const ByteStringView& szFuncName,
                        CFXJSE_Arguments& args);
   static void UnitValue(CFXJSE_Value* pThis,
-                        const CFX_ByteStringC& szFuncName,
+                        const ByteStringView& szFuncName,
                         CFXJSE_Arguments& args);
 
   static void At(CFXJSE_Value* pThis,
-                 const CFX_ByteStringC& szFuncName,
+                 const ByteStringView& szFuncName,
                  CFXJSE_Arguments& args);
   static void Concat(CFXJSE_Value* pThis,
-                     const CFX_ByteStringC& szFuncName,
+                     const ByteStringView& szFuncName,
                      CFXJSE_Arguments& args);
   static void Decode(CFXJSE_Value* pThis,
-                     const CFX_ByteStringC& szFuncName,
+                     const ByteStringView& szFuncName,
                      CFXJSE_Arguments& args);
-  static CFX_WideString DecodeURL(const CFX_WideString& wsURLString);
-  static CFX_WideString DecodeHTML(const CFX_WideString& wsHTMLString);
-  static CFX_WideString DecodeXML(const CFX_WideString& wsXMLString);
+  static WideString DecodeURL(const WideString& wsURLString);
+  static WideString DecodeHTML(const WideString& wsHTMLString);
+  static WideString DecodeXML(const WideString& wsXMLString);
   static void Encode(CFXJSE_Value* pThis,
-                     const CFX_ByteStringC& szFuncName,
+                     const ByteStringView& szFuncName,
                      CFXJSE_Arguments& args);
-  static CFX_WideString EncodeURL(const CFX_ByteString& szURLString);
-  static CFX_WideString EncodeHTML(const CFX_ByteString& szHTMLString);
-  static CFX_WideString EncodeXML(const CFX_ByteString& szXMLString);
-  static bool HTMLSTR2Code(const CFX_WideStringC& pData, uint32_t* iCode);
-  static bool HTMLCode2STR(uint32_t iCode, CFX_WideString* wsHTMLReserve);
+  static WideString EncodeURL(const ByteString& szURLString);
+  static WideString EncodeHTML(const ByteString& szHTMLString);
+  static WideString EncodeXML(const ByteString& szXMLString);
+  static bool HTMLSTR2Code(const WideStringView& pData, uint32_t* iCode);
+  static bool HTMLCode2STR(uint32_t iCode, WideString* wsHTMLReserve);
   static void Format(CFXJSE_Value* pThis,
-                     const CFX_ByteStringC& szFuncName,
+                     const ByteStringView& szFuncName,
                      CFXJSE_Arguments& args);
   static void Left(CFXJSE_Value* pThis,
-                   const CFX_ByteStringC& szFuncName,
+                   const ByteStringView& szFuncName,
                    CFXJSE_Arguments& args);
   static void Len(CFXJSE_Value* pThis,
-                  const CFX_ByteStringC& szFuncName,
+                  const ByteStringView& szFuncName,
                   CFXJSE_Arguments& args);
   static void Lower(CFXJSE_Value* pThis,
-                    const CFX_ByteStringC& szFuncName,
+                    const ByteStringView& szFuncName,
                     CFXJSE_Arguments& args);
   static void Ltrim(CFXJSE_Value* pThis,
-                    const CFX_ByteStringC& szFuncName,
+                    const ByteStringView& szFuncName,
                     CFXJSE_Arguments& args);
   static void Parse(CFXJSE_Value* pThis,
-                    const CFX_ByteStringC& szFuncName,
+                    const ByteStringView& szFuncName,
                     CFXJSE_Arguments& args);
   static void Replace(CFXJSE_Value* pThis,
-                      const CFX_ByteStringC& szFuncName,
+                      const ByteStringView& szFuncName,
                       CFXJSE_Arguments& args);
   static void Right(CFXJSE_Value* pThis,
-                    const CFX_ByteStringC& szFuncName,
+                    const ByteStringView& szFuncName,
                     CFXJSE_Arguments& args);
   static void Rtrim(CFXJSE_Value* pThis,
-                    const CFX_ByteStringC& szFuncName,
+                    const ByteStringView& szFuncName,
                     CFXJSE_Arguments& args);
   static void Space(CFXJSE_Value* pThis,
-                    const CFX_ByteStringC& szFuncName,
+                    const ByteStringView& szFuncName,
                     CFXJSE_Arguments& args);
   static void Str(CFXJSE_Value* pThis,
-                  const CFX_ByteStringC& szFuncName,
+                  const ByteStringView& szFuncName,
                   CFXJSE_Arguments& args);
   static void Stuff(CFXJSE_Value* pThis,
-                    const CFX_ByteStringC& szFuncName,
+                    const ByteStringView& szFuncName,
                     CFXJSE_Arguments& args);
   static void Substr(CFXJSE_Value* pThis,
-                     const CFX_ByteStringC& szFuncName,
+                     const ByteStringView& szFuncName,
                      CFXJSE_Arguments& args);
   static void Uuid(CFXJSE_Value* pThis,
-                   const CFX_ByteStringC& szFuncName,
+                   const ByteStringView& szFuncName,
                    CFXJSE_Arguments& args);
   static void Upper(CFXJSE_Value* pThis,
-                    const CFX_ByteStringC& szFuncName,
+                    const ByteStringView& szFuncName,
                     CFXJSE_Arguments& args);
   static void WordNum(CFXJSE_Value* pThis,
-                      const CFX_ByteStringC& szFuncName,
+                      const ByteStringView& szFuncName,
                       CFXJSE_Arguments& args);
-  static CFX_ByteString TrillionUS(const CFX_ByteStringC& szData);
-  static CFX_ByteString WordUS(const CFX_ByteString& szData, int32_t iStyle);
+  static ByteString TrillionUS(const ByteStringView& szData);
+  static ByteString WordUS(const ByteString& szData, int32_t iStyle);
 
   static void Get(CFXJSE_Value* pThis,
-                  const CFX_ByteStringC& szFuncName,
+                  const ByteStringView& szFuncName,
                   CFXJSE_Arguments& args);
   static void Post(CFXJSE_Value* pThis,
-                   const CFX_ByteStringC& szFuncName,
+                   const ByteStringView& szFuncName,
                    CFXJSE_Arguments& args);
   static void Put(CFXJSE_Value* pThis,
-                  const CFX_ByteStringC& szFuncName,
+                  const ByteStringView& szFuncName,
                   CFXJSE_Arguments& args);
   static void assign_value_operator(CFXJSE_Value* pThis,
-                                    const CFX_ByteStringC& szFuncName,
+                                    const ByteStringView& szFuncName,
                                     CFXJSE_Arguments& args);
   static void logical_or_operator(CFXJSE_Value* pThis,
-                                  const CFX_ByteStringC& szFuncName,
+                                  const ByteStringView& szFuncName,
                                   CFXJSE_Arguments& args);
   static void logical_and_operator(CFXJSE_Value* pThis,
-                                   const CFX_ByteStringC& szFuncName,
+                                   const ByteStringView& szFuncName,
                                    CFXJSE_Arguments& args);
   static void equality_operator(CFXJSE_Value* pThis,
-                                const CFX_ByteStringC& szFuncName,
+                                const ByteStringView& szFuncName,
                                 CFXJSE_Arguments& args);
   static void notequality_operator(CFXJSE_Value* pThis,
-                                   const CFX_ByteStringC& szFuncName,
+                                   const ByteStringView& szFuncName,
                                    CFXJSE_Arguments& args);
   static bool fm_ref_equal(CFXJSE_Value* pThis, CFXJSE_Arguments& args);
   static void less_operator(CFXJSE_Value* pThis,
-                            const CFX_ByteStringC& szFuncName,
+                            const ByteStringView& szFuncName,
                             CFXJSE_Arguments& args);
   static void lessequal_operator(CFXJSE_Value* pThis,
-                                 const CFX_ByteStringC& szFuncName,
+                                 const ByteStringView& szFuncName,
                                  CFXJSE_Arguments& args);
   static void greater_operator(CFXJSE_Value* pThis,
-                               const CFX_ByteStringC& szFuncName,
+                               const ByteStringView& szFuncName,
                                CFXJSE_Arguments& args);
   static void greaterequal_operator(CFXJSE_Value* pThis,
-                                    const CFX_ByteStringC& szFuncName,
+                                    const ByteStringView& szFuncName,
                                     CFXJSE_Arguments& args);
   static void plus_operator(CFXJSE_Value* pThis,
-                            const CFX_ByteStringC& szFuncName,
+                            const ByteStringView& szFuncName,
                             CFXJSE_Arguments& args);
   static void minus_operator(CFXJSE_Value* pThis,
-                             const CFX_ByteStringC& szFuncName,
+                             const ByteStringView& szFuncName,
                              CFXJSE_Arguments& args);
   static void multiple_operator(CFXJSE_Value* pThis,
-                                const CFX_ByteStringC& szFuncName,
+                                const ByteStringView& szFuncName,
                                 CFXJSE_Arguments& args);
   static void divide_operator(CFXJSE_Value* pThis,
-                              const CFX_ByteStringC& szFuncName,
+                              const ByteStringView& szFuncName,
                               CFXJSE_Arguments& args);
   static void positive_operator(CFXJSE_Value* pThis,
-                                const CFX_ByteStringC& szFuncName,
+                                const ByteStringView& szFuncName,
                                 CFXJSE_Arguments& args);
   static void negative_operator(CFXJSE_Value* pThis,
-                                const CFX_ByteStringC& szFuncName,
+                                const ByteStringView& szFuncName,
                                 CFXJSE_Arguments& args);
   static void logical_not_operator(CFXJSE_Value* pThis,
-                                   const CFX_ByteStringC& szFuncName,
+                                   const ByteStringView& szFuncName,
                                    CFXJSE_Arguments& args);
   static void dot_accessor(CFXJSE_Value* pThis,
-                           const CFX_ByteStringC& szFuncName,
+                           const ByteStringView& szFuncName,
                            CFXJSE_Arguments& args);
   static void dotdot_accessor(CFXJSE_Value* pThis,
-                              const CFX_ByteStringC& szFuncName,
+                              const ByteStringView& szFuncName,
                               CFXJSE_Arguments& args);
   static void eval_translation(CFXJSE_Value* pThis,
-                               const CFX_ByteStringC& szFuncName,
+                               const ByteStringView& szFuncName,
                                CFXJSE_Arguments& args);
   static void is_fm_object(CFXJSE_Value* pThis,
-                           const CFX_ByteStringC& szFuncName,
+                           const ByteStringView& szFuncName,
                            CFXJSE_Arguments& args);
   static void is_fm_array(CFXJSE_Value* pThis,
-                          const CFX_ByteStringC& szFuncName,
+                          const ByteStringView& szFuncName,
                           CFXJSE_Arguments& args);
   static void get_fm_value(CFXJSE_Value* pThis,
-                           const CFX_ByteStringC& szFuncName,
+                           const ByteStringView& szFuncName,
                            CFXJSE_Arguments& args);
   static void get_fm_jsobj(CFXJSE_Value* pThis,
-                           const CFX_ByteStringC& szFuncName,
+                           const ByteStringView& szFuncName,
                            CFXJSE_Arguments& args);
   static void fm_var_filter(CFXJSE_Value* pThis,
-                            const CFX_ByteStringC& szFuncName,
+                            const ByteStringView& szFuncName,
                             CFXJSE_Arguments& args);
   static void concat_fm_object(CFXJSE_Value* pThis,
-                               const CFX_ByteStringC& szFuncName,
+                               const ByteStringView& szFuncName,
                                CFXJSE_Arguments& args);
 
   static int32_t hvalue_get_array_length(CFXJSE_Value* pThis,
@@ -387,16 +385,16 @@ class CXFA_FM2JSContext : public CFXJSE_HostObject {
                                     CFXJSE_Value* pDefaultValue);
   static bool SetObjectDefaultValue(CFXJSE_Value* pObjectValue,
                                     CFXJSE_Value* pNewValue);
-  static CFX_ByteString GenerateSomExpression(const CFX_ByteStringC& szName,
-                                              int32_t iIndexFlags,
-                                              int32_t iIndexValue,
-                                              bool bIsStar);
+  static ByteString GenerateSomExpression(const ByteStringView& szName,
+                                          int32_t iIndexFlags,
+                                          int32_t iIndexValue,
+                                          bool bIsStar);
   static bool GetObjectForName(CFXJSE_Value* pThis,
                                CFXJSE_Value* accessorValue,
-                               const CFX_ByteStringC& szAccessorName);
+                               const ByteStringView& szAccessorName);
   static int32_t ResolveObjects(CFXJSE_Value* pThis,
                                 CFXJSE_Value* pParentValue,
-                                const CFX_ByteStringC& bsSomExp,
+                                const ByteStringView& bsSomExp,
                                 XFA_RESOLVENODE_RS& resoveNodeRS,
                                 bool bdotAccessor = true,
                                 bool bHasNoResolveName = false);
@@ -414,12 +412,12 @@ class CXFA_FM2JSContext : public CFXJSE_HostObject {
   static int32_t ValueToInteger(CFXJSE_Value* pThis, CFXJSE_Value* pValue);
   static float ValueToFloat(CFXJSE_Value* pThis, CFXJSE_Value* pValue);
   static double ValueToDouble(CFXJSE_Value* pThis, CFXJSE_Value* pValue);
-  static CFX_ByteString ValueToUTF8String(CFXJSE_Value* pValue);
+  static ByteString ValueToUTF8String(CFXJSE_Value* pValue);
   static double ExtractDouble(CFXJSE_Value* pThis,
                               CFXJSE_Value* src,
                               bool* ret);
 
-  static bool Translate(const CFX_WideStringC& wsFormcalc,
+  static bool Translate(const WideStringView& wsFormcalc,
                         CFX_WideTextBuf* wsJavascript);
 
   void GlobalPropertyGetter(CFXJSE_Value* pValue);
@@ -428,14 +426,14 @@ class CXFA_FM2JSContext : public CFXJSE_HostObject {
   v8::Isolate* GetScriptRuntime() const { return m_pIsolate; }
   CXFA_Document* GetDocument() const { return m_pDocument.Get(); }
 
-  void ThrowNoDefaultPropertyException(const CFX_ByteStringC& name) const;
+  void ThrowNoDefaultPropertyException(const ByteStringView& name) const;
   void ThrowCompilerErrorException() const;
   void ThrowDivideByZeroException() const;
   void ThrowServerDeniedException() const;
-  void ThrowPropertyNotInObjectException(const CFX_WideString& name,
-                                         const CFX_WideString& exp) const;
+  void ThrowPropertyNotInObjectException(const WideString& name,
+                                         const WideString& exp) const;
   void ThrowArgumentMismatchException() const;
-  void ThrowParamCountMismatchException(const CFX_WideString& method) const;
+  void ThrowParamCountMismatchException(const WideString& method) const;
   void ThrowException(const wchar_t* str, ...) const;
 
   v8::Isolate* m_pIsolate;
diff --git a/xfa/fxfa/fm2js/cxfa_fmexpression.cpp b/xfa/fxfa/fm2js/cxfa_fmexpression.cpp
index 2faa1914b1..a1bbb50271 100644
--- a/xfa/fxfa/fm2js/cxfa_fmexpression.cpp
+++ b/xfa/fxfa/fm2js/cxfa_fmexpression.cpp
@@ -40,8 +40,8 @@ bool CXFA_FMExpression::ToImpliedReturnJS(CFX_WideTextBuf& javascript) {
 CXFA_FMFunctionDefinition::CXFA_FMFunctionDefinition(
     uint32_t line,
     bool isGlobal,
-    const CFX_WideStringC& wsName,
-    std::vector<CFX_WideStringC>&& arguments,
+    const WideStringView& wsName,
+    std::vector<WideStringView>&& arguments,
     std::vector<std::unique_ptr<CXFA_FMExpression>>&& expressions)
     : CXFA_FMExpression(line, XFA_FM_EXPTYPE_FUNC),
       m_wsName(wsName),
@@ -61,7 +61,7 @@ bool CXFA_FMFunctionDefinition::ToJavaScript(CFX_WideTextBuf& javascript) {
   }
   javascript << L"function ";
   if (!m_wsName.IsEmpty() && m_wsName[0] == L'!') {
-    CFX_WideString tempName =
+    WideString tempName =
         EXCLAMATION_IN_IDENTIFIER + m_wsName.Right(m_wsName.GetLength() - 1);
     javascript << tempName;
   } else {
@@ -73,9 +73,8 @@ bool CXFA_FMFunctionDefinition::ToJavaScript(CFX_WideTextBuf& javascript) {
     if (bNeedComma)
       javascript << L", ";
     if (identifier[0] == L'!') {
-      CFX_WideString tempIdentifier =
-          EXCLAMATION_IN_IDENTIFIER +
-          identifier.Right(identifier.GetLength() - 1);
+      WideString tempIdentifier = EXCLAMATION_IN_IDENTIFIER +
+                                  identifier.Right(identifier.GetLength() - 1);
       javascript << tempIdentifier;
     } else {
       javascript << identifier;
@@ -117,7 +116,7 @@ bool CXFA_FMFunctionDefinition::ToImpliedReturnJS(CFX_WideTextBuf&) {
 
 CXFA_FMVarExpression::CXFA_FMVarExpression(
     uint32_t line,
-    const CFX_WideStringC& wsName,
+    const WideStringView& wsName,
     std::unique_ptr<CXFA_FMExpression> pInit)
     : CXFA_FMExpression(line, XFA_FM_EXPTYPE_VAR),
       m_wsName(wsName),
@@ -127,7 +126,7 @@ CXFA_FMVarExpression::~CXFA_FMVarExpression() {}
 
 bool CXFA_FMVarExpression::ToJavaScript(CFX_WideTextBuf& javascript) {
   javascript << L"var ";
-  CFX_WideString tempName(m_wsName);
+  WideString tempName(m_wsName);
   if (m_wsName[0] == L'!') {
     tempName =
         EXCLAMATION_IN_IDENTIFIER + m_wsName.Right(m_wsName.GetLength() - 1);
@@ -151,7 +150,7 @@ bool CXFA_FMVarExpression::ToJavaScript(CFX_WideTextBuf& javascript) {
 
 bool CXFA_FMVarExpression::ToImpliedReturnJS(CFX_WideTextBuf& javascript) {
   javascript << L"var ";
-  CFX_WideString tempName(m_wsName);
+  WideString tempName(m_wsName);
   if (m_wsName[0] == L'!') {
     tempName =
         EXCLAMATION_IN_IDENTIFIER + m_wsName.Right(m_wsName.GetLength() - 1);
@@ -440,7 +439,7 @@ bool CXFA_FMContinueExpression::ToImpliedReturnJS(CFX_WideTextBuf& javascript) {
 
 CXFA_FMForExpression::CXFA_FMForExpression(
     uint32_t line,
-    const CFX_WideStringC& wsVariant,
+    const WideStringView& wsVariant,
     std::unique_ptr<CXFA_FMSimpleExpression> pAssignment,
     std::unique_ptr<CXFA_FMSimpleExpression> pAccessor,
     int32_t iDirection,
@@ -458,7 +457,7 @@ CXFA_FMForExpression::~CXFA_FMForExpression() {}
 
 bool CXFA_FMForExpression::ToJavaScript(CFX_WideTextBuf& javascript) {
   javascript << L"{\nvar ";
-  CFX_WideString tempVariant;
+  WideString tempVariant;
   if (m_wsVariant[0] == L'!') {
     tempVariant = EXCLAMATION_IN_IDENTIFIER +
                   m_wsVariant.Right(m_wsVariant.GetLength() - 1);
@@ -513,7 +512,7 @@ bool CXFA_FMForExpression::ToImpliedReturnJS(CFX_WideTextBuf& javascript) {
   javascript << RUNTIMEFUNCTIONRETURNVALUE;
   javascript << L" = 0;\n";
   javascript << L"{\nvar ";
-  CFX_WideString tempVariant;
+  WideString tempVariant;
   if (m_wsVariant[0] == L'!') {
     tempVariant = EXCLAMATION_IN_IDENTIFIER +
                   m_wsVariant.Right(m_wsVariant.GetLength() - 1);
@@ -567,7 +566,7 @@ bool CXFA_FMForExpression::ToImpliedReturnJS(CFX_WideTextBuf& javascript) {
 
 CXFA_FMForeachExpression::CXFA_FMForeachExpression(
     uint32_t line,
-    const CFX_WideStringC& wsIdentifier,
+    const WideStringView& wsIdentifier,
     std::vector<std::unique_ptr<CXFA_FMSimpleExpression>>&& pAccessors,
     std::unique_ptr<CXFA_FMExpression> pList)
     : CXFA_FMLoopExpression(line),
@@ -581,7 +580,7 @@ bool CXFA_FMForeachExpression::ToJavaScript(CFX_WideTextBuf& javascript) {
   javascript << L"{\n";
   javascript << L"var ";
   if (m_wsIdentifier[0] == L'!') {
-    CFX_WideString tempIdentifier =
+    WideString tempIdentifier =
         EXCLAMATION_IN_IDENTIFIER +
         m_wsIdentifier.Right(m_wsIdentifier.GetLength() - 1);
     javascript << tempIdentifier;
@@ -613,7 +612,7 @@ bool CXFA_FMForeachExpression::ToJavaScript(CFX_WideTextBuf& javascript) {
   javascript << RUNTIMEBLOCKTEMPARRAY;
   javascript << L".length)\n{\n";
   if (m_wsIdentifier[0] == L'!') {
-    CFX_WideString tempIdentifier =
+    WideString tempIdentifier =
         EXCLAMATION_IN_IDENTIFIER +
         m_wsIdentifier.Right(m_wsIdentifier.GetLength() - 1);
     javascript << tempIdentifier;
@@ -638,7 +637,7 @@ bool CXFA_FMForeachExpression::ToImpliedReturnJS(CFX_WideTextBuf& javascript) {
   javascript << L"{\n";
   javascript << L"var ";
   if (m_wsIdentifier[0] == L'!') {
-    CFX_WideString tempIdentifier =
+    WideString tempIdentifier =
         EXCLAMATION_IN_IDENTIFIER +
         m_wsIdentifier.Right(m_wsIdentifier.GetLength() - 1);
     javascript << tempIdentifier;
@@ -669,7 +668,7 @@ bool CXFA_FMForeachExpression::ToImpliedReturnJS(CFX_WideTextBuf& javascript) {
   javascript << RUNTIMEBLOCKTEMPARRAY;
   javascript << L".length)\n{\n";
   if (m_wsIdentifier[0] == L'!') {
-    CFX_WideString tempIdentifier =
+    WideString tempIdentifier =
         EXCLAMATION_IN_IDENTIFIER +
         m_wsIdentifier.Right(m_wsIdentifier.GetLength() - 1);
     javascript << tempIdentifier;
diff --git a/xfa/fxfa/fm2js/cxfa_fmexpression.h b/xfa/fxfa/fm2js/cxfa_fmexpression.h
index 47b2d9cabd..cfbba3af22 100644
--- a/xfa/fxfa/fm2js/cxfa_fmexpression.h
+++ b/xfa/fxfa/fm2js/cxfa_fmexpression.h
@@ -47,8 +47,8 @@ class CXFA_FMFunctionDefinition : public CXFA_FMExpression {
   CXFA_FMFunctionDefinition(
       uint32_t line,
       bool isGlobal,
-      const CFX_WideStringC& wsName,
-      std::vector<CFX_WideStringC>&& arguments,
+      const WideStringView& wsName,
+      std::vector<WideStringView>&& arguments,
       std::vector<std::unique_ptr<CXFA_FMExpression>>&& expressions);
   ~CXFA_FMFunctionDefinition() override;
 
@@ -56,8 +56,8 @@ class CXFA_FMFunctionDefinition : public CXFA_FMExpression {
   bool ToImpliedReturnJS(CFX_WideTextBuf&) override;
 
  private:
-  CFX_WideStringC m_wsName;
-  std::vector<CFX_WideStringC> m_pArguments;
+  WideStringView m_wsName;
+  std::vector<WideStringView> m_pArguments;
   std::vector<std::unique_ptr<CXFA_FMExpression>> m_pExpressions;
   bool m_isGlobal;
 };
@@ -65,7 +65,7 @@ class CXFA_FMFunctionDefinition : public CXFA_FMExpression {
 class CXFA_FMVarExpression : public CXFA_FMExpression {
  public:
   CXFA_FMVarExpression(uint32_t line,
-                       const CFX_WideStringC& wsName,
+                       const WideStringView& wsName,
                        std::unique_ptr<CXFA_FMExpression> pInit);
   ~CXFA_FMVarExpression() override;
 
@@ -73,7 +73,7 @@ class CXFA_FMVarExpression : public CXFA_FMExpression {
   bool ToImpliedReturnJS(CFX_WideTextBuf&) override;
 
  private:
-  CFX_WideStringC m_wsName;
+  WideStringView m_wsName;
   std::unique_ptr<CXFA_FMExpression> m_pInit;
 };
 
@@ -175,7 +175,7 @@ class CXFA_FMContinueExpression : public CXFA_FMExpression {
 class CXFA_FMForExpression : public CXFA_FMLoopExpression {
  public:
   CXFA_FMForExpression(uint32_t line,
-                       const CFX_WideStringC& wsVariant,
+                       const WideStringView& wsVariant,
                        std::unique_ptr<CXFA_FMSimpleExpression> pAssignment,
                        std::unique_ptr<CXFA_FMSimpleExpression> pAccessor,
                        int32_t iDirection,
@@ -187,7 +187,7 @@ class CXFA_FMForExpression : public CXFA_FMLoopExpression {
   bool ToImpliedReturnJS(CFX_WideTextBuf&) override;
 
  private:
-  CFX_WideStringC m_wsVariant;
+  WideStringView m_wsVariant;
   std::unique_ptr<CXFA_FMSimpleExpression> m_pAssignment;
   std::unique_ptr<CXFA_FMSimpleExpression> m_pAccessor;
   const bool m_bDirection;
@@ -200,7 +200,7 @@ class CXFA_FMForeachExpression : public CXFA_FMLoopExpression {
   // Takes ownership of |pAccessors|.
   CXFA_FMForeachExpression(
       uint32_t line,
-      const CFX_WideStringC& wsIdentifier,
+      const WideStringView& wsIdentifier,
       std::vector<std::unique_ptr<CXFA_FMSimpleExpression>>&& pAccessors,
       std::unique_ptr<CXFA_FMExpression> pList);
   ~CXFA_FMForeachExpression() override;
@@ -209,7 +209,7 @@ class CXFA_FMForeachExpression : public CXFA_FMLoopExpression {
   bool ToImpliedReturnJS(CFX_WideTextBuf&) override;
 
  private:
-  CFX_WideStringC m_wsIdentifier;
+  WideStringView m_wsIdentifier;
   std::vector<std::unique_ptr<CXFA_FMSimpleExpression>> m_pAccessors;
   std::unique_ptr<CXFA_FMExpression> m_pList;
 };
diff --git a/xfa/fxfa/fm2js/cxfa_fmlexer.cpp b/xfa/fxfa/fm2js/cxfa_fmlexer.cpp
index 1a43e837f4..f6b2a58944 100644
--- a/xfa/fxfa/fm2js/cxfa_fmlexer.cpp
+++ b/xfa/fxfa/fm2js/cxfa_fmlexer.cpp
@@ -122,7 +122,7 @@ const wchar_t* tokenStrings[] = {
     L"TOKcall",       L"TOKstring",     L"TOKnumber",   L"TOKreserver",
 };
 
-XFA_FM_TOKEN TokenizeIdentifier(const CFX_WideStringC& str) {
+XFA_FM_TOKEN TokenizeIdentifier(const WideStringView& str) {
   uint32_t key = FX_HashCode_GetW(str, true);
 
   const XFA_FMKeyword* end = std::begin(keyWords) + KEYWORD_END + 1;
@@ -145,8 +145,8 @@ CXFA_FMToken::CXFA_FMToken(uint32_t line_num)
 
 CXFA_FMToken::~CXFA_FMToken() {}
 
-CFX_WideString CXFA_FMToken::ToDebugString() const {
-  CFX_WideString str(L"type = ");
+WideString CXFA_FMToken::ToDebugString() const {
+  WideString str(L"type = ");
   str += tokenStrings[m_type];
   str += L", string = ";
   str += m_string;
@@ -155,7 +155,7 @@ CFX_WideString CXFA_FMToken::ToDebugString() const {
   return str;
 }
 
-CXFA_FMLexer::CXFA_FMLexer(const CFX_WideStringC& wsFormCalc)
+CXFA_FMLexer::CXFA_FMLexer(const WideStringView& wsFormCalc)
     : m_cursor(wsFormCalc.unterminated_c_str()),
       m_end(m_cursor + wsFormCalc.GetLength() - 1),
       m_current_line(1),
@@ -378,7 +378,7 @@ void CXFA_FMLexer::AdvanceForNumber() {
   }
 
   m_token->m_string =
-      CFX_WideStringC(m_cursor, static_cast<FX_STRSIZE>(end - m_cursor));
+      WideStringView(m_cursor, static_cast<FX_STRSIZE>(end - m_cursor));
   m_cursor = end;
 }
 
@@ -395,7 +395,7 @@ void CXFA_FMLexer::AdvanceForString() {
       // If the end of the input has been reached it was not escaped.
       if (m_cursor > m_end) {
         m_token->m_string =
-            CFX_WideStringC(start, static_cast<FX_STRSIZE>(m_cursor - start));
+            WideStringView(start, static_cast<FX_STRSIZE>(m_cursor - start));
         return;
       }
       // If the next character is not a " then the end of the string has been
@@ -404,7 +404,7 @@ void CXFA_FMLexer::AdvanceForString() {
         if (!IsFormCalcCharacter(*m_cursor)) {
           break;
         }
-        m_token->m_string = CFX_WideStringC(start, (m_cursor - start));
+        m_token->m_string = WideStringView(start, (m_cursor - start));
         return;
       }
     }
@@ -430,7 +430,7 @@ void CXFA_FMLexer::AdvanceForIdentifier() {
     ++m_cursor;
   }
   m_token->m_string =
-      CFX_WideStringC(start, static_cast<FX_STRSIZE>(m_cursor - start));
+      WideStringView(start, static_cast<FX_STRSIZE>(m_cursor - start));
   m_token->m_type = TokenizeIdentifier(m_token->m_string);
 }
 
diff --git a/xfa/fxfa/fm2js/cxfa_fmlexer.h b/xfa/fxfa/fm2js/cxfa_fmlexer.h
index 39031760d9..b9764c5aba 100644
--- a/xfa/fxfa/fm2js/cxfa_fmlexer.h
+++ b/xfa/fxfa/fm2js/cxfa_fmlexer.h
@@ -95,16 +95,16 @@ class CXFA_FMToken {
   explicit CXFA_FMToken(uint32_t line_num);
   ~CXFA_FMToken();
 
-  CFX_WideString ToDebugString() const;
+  WideString ToDebugString() const;
 
-  CFX_WideStringC m_string;
+  WideStringView m_string;
   XFA_FM_TOKEN m_type;
   uint32_t m_line_num;
 };
 
 class CXFA_FMLexer {
  public:
-  explicit CXFA_FMLexer(const CFX_WideStringC& wsFormcalc);
+  explicit CXFA_FMLexer(const WideStringView& wsFormcalc);
   ~CXFA_FMLexer();
 
   std::unique_ptr<CXFA_FMToken> NextToken();
diff --git a/xfa/fxfa/fm2js/cxfa_fmparser.cpp b/xfa/fxfa/fm2js/cxfa_fmparser.cpp
index 65517fb79d..16538503de 100644
--- a/xfa/fxfa/fm2js/cxfa_fmparser.cpp
+++ b/xfa/fxfa/fm2js/cxfa_fmparser.cpp
@@ -20,7 +20,7 @@ const unsigned int kMaxParseDepth = 1250;
 
 }  // namespace
 
-CXFA_FMParser::CXFA_FMParser(const CFX_WideStringC& wsFormcalc)
+CXFA_FMParser::CXFA_FMParser(const WideStringView& wsFormcalc)
     : m_error(false), m_parse_depth(0), m_max_parse_depth(kMaxParseDepth) {
   m_lexer = pdfium::MakeUnique<CXFA_FMLexer>(wsFormcalc);
   m_token = m_lexer->NextToken();
@@ -33,7 +33,7 @@ std::unique_ptr<CXFA_FMFunctionDefinition> CXFA_FMParser::Parse() {
   if (HasError())
     return nullptr;
 
-  std::vector<CFX_WideStringC> arguments;
+  std::vector<WideStringView> arguments;
   return pdfium::MakeUnique<CXFA_FMFunctionDefinition>(
       1, true, L"", std::move(arguments), std::move(expressions));
 }
@@ -92,8 +92,8 @@ std::unique_ptr<CXFA_FMExpression> CXFA_FMParser::ParseFunction() {
   if (HasError() || !IncrementParseDepthAndCheck())
     return nullptr;
 
-  CFX_WideStringC ident;
-  std::vector<CFX_WideStringC> arguments;
+  WideStringView ident;
+  std::vector<WideStringView> arguments;
   std::vector<std::unique_ptr<CXFA_FMExpression>> expressions;
   uint32_t line = m_token->m_line_num;
   if (!NextToken())
@@ -208,7 +208,7 @@ std::unique_ptr<CXFA_FMExpression> CXFA_FMParser::ParseVarExpression() {
   if (HasError() || !IncrementParseDepthAndCheck())
     return nullptr;
 
-  CFX_WideStringC ident;
+  WideStringView ident;
   uint32_t line = m_token->m_line_num;
   if (!NextToken())
     return nullptr;
@@ -613,7 +613,7 @@ CXFA_FMParser::ParsePrimaryExpression() {
         return nullptr;
       break;
     case TOKidentifier: {
-      CFX_WideStringC wsIdentifier(m_token->m_string);
+      WideStringView wsIdentifier(m_token->m_string);
       if (!NextToken())
         return nullptr;
       if (m_token->m_type == TOKlbracket) {
@@ -714,7 +714,7 @@ std::unique_ptr<CXFA_FMSimpleExpression> CXFA_FMParser::ParsePostExpression(
           m_error = true;
           return nullptr;
         }
-        CFX_WideStringC tempStr = m_token->m_string;
+        WideStringView tempStr = m_token->m_string;
         uint32_t tempLine = m_token->m_line_num;
         if (!NextToken())
           return nullptr;
@@ -786,7 +786,7 @@ std::unique_ptr<CXFA_FMSimpleExpression> CXFA_FMParser::ParsePostExpression(
           m_error = true;
           return nullptr;
         }
-        CFX_WideStringC tempStr = m_token->m_string;
+        WideStringView tempStr = m_token->m_string;
         uint32_t tempLine = m_token->m_line_num;
         if (!NextToken())
           return nullptr;
@@ -813,7 +813,7 @@ std::unique_ptr<CXFA_FMSimpleExpression> CXFA_FMParser::ParsePostExpression(
           m_error = true;
           return nullptr;
         }
-        CFX_WideStringC tempStr = m_token->m_string;
+        WideStringView tempStr = m_token->m_string;
         uint32_t tempLine = m_token->m_line_num;
         if (!NextToken())
           return nullptr;
@@ -1083,7 +1083,7 @@ std::unique_ptr<CXFA_FMExpression> CXFA_FMParser::ParseForExpression() {
   if (HasError() || !IncrementParseDepthAndCheck())
     return nullptr;
 
-  CFX_WideStringC wsVariant;
+  WideStringView wsVariant;
   uint32_t line = m_token->m_line_num;
   if (!NextToken())
     return nullptr;
@@ -1152,7 +1152,7 @@ std::unique_ptr<CXFA_FMExpression> CXFA_FMParser::ParseForeachExpression() {
     return nullptr;
 
   std::unique_ptr<CXFA_FMExpression> expr;
-  CFX_WideStringC wsIdentifier;
+  WideStringView wsIdentifier;
   std::vector<std::unique_ptr<CXFA_FMSimpleExpression>> pAccessors;
   std::unique_ptr<CXFA_FMExpression> pList;
   uint32_t line = m_token->m_line_num;
diff --git a/xfa/fxfa/fm2js/cxfa_fmparser.h b/xfa/fxfa/fm2js/cxfa_fmparser.h
index ddfaa1aaa6..c536838a3c 100644
--- a/xfa/fxfa/fm2js/cxfa_fmparser.h
+++ b/xfa/fxfa/fm2js/cxfa_fmparser.h
@@ -15,7 +15,7 @@
 
 class CXFA_FMParser {
  public:
-  explicit CXFA_FMParser(const CFX_WideStringC& wsFormcalc);
+  explicit CXFA_FMParser(const WideStringView& wsFormcalc);
   ~CXFA_FMParser();
 
   std::unique_ptr<CXFA_FMFunctionDefinition> Parse();
diff --git a/xfa/fxfa/fm2js/cxfa_fmparser_unittest.cpp b/xfa/fxfa/fm2js/cxfa_fmparser_unittest.cpp
index a7e784e63d..192f935309 100644
--- a/xfa/fxfa/fm2js/cxfa_fmparser_unittest.cpp
+++ b/xfa/fxfa/fm2js/cxfa_fmparser_unittest.cpp
@@ -20,7 +20,7 @@ TEST(CXFA_FMParserTest, Empty) {
   CFX_WideTextBuf buf;
   EXPECT_TRUE(ast->ToJavaScript(buf));
   // TODO(dsinclair): This is a little weird .....
-  EXPECT_EQ(L"// comments only", buf.AsStringC());
+  EXPECT_EQ(L"// comments only", buf.AsStringView());
 }
 
 TEST(CXFA_FMParserTest, CommentOnlyIsError) {
@@ -33,7 +33,7 @@ TEST(CXFA_FMParserTest, CommentOnlyIsError) {
 
   CFX_WideTextBuf buf;
   EXPECT_TRUE(ast->ToJavaScript(buf));
-  EXPECT_EQ(L"// comments only", buf.AsStringC());
+  EXPECT_EQ(L"// comments only", buf.AsStringView());
 }
 
 TEST(CXFA_FMParserTest, CommentThenValue) {
@@ -51,7 +51,7 @@ TEST(CXFA_FMParserTest, CommentThenValue) {
 
   CFX_WideTextBuf buf;
   EXPECT_TRUE(ast->ToJavaScript(buf));
-  EXPECT_EQ(ret, buf.AsStringC());
+  EXPECT_EQ(ret, buf.AsStringView());
 }
 
 TEST(CXFA_FMParserTest, Parse) {
@@ -106,7 +106,7 @@ TEST(CXFA_FMParserTest, Parse) {
 
   CFX_WideTextBuf buf;
   EXPECT_TRUE(ast->ToJavaScript(buf));
-  EXPECT_EQ(ret, buf.AsStringC());
+  EXPECT_EQ(ret, buf.AsStringView());
 }
 
 TEST(CXFA_FMParserTest, MaxParseDepth) {
diff --git a/xfa/fxfa/fm2js/cxfa_fmsimpleexpression.cpp b/xfa/fxfa/fm2js/cxfa_fmsimpleexpression.cpp
index fc07609f85..73dfdd55bc 100644
--- a/xfa/fxfa/fm2js/cxfa_fmsimpleexpression.cpp
+++ b/xfa/fxfa/fm2js/cxfa_fmsimpleexpression.cpp
@@ -81,7 +81,7 @@ const XFA_FMSOMMethod gs_FMSomMethods[] = {
 
 }  // namespace
 
-CFX_WideStringC XFA_FM_EXPTypeToString(
+WideStringView XFA_FM_EXPTypeToString(
     XFA_FM_SimpleExpressionType simpleExpType) {
   return gs_lpStrExpFuncName[simpleExpType];
 }
@@ -110,7 +110,7 @@ bool CXFA_FMNullExpression::ToJavaScript(CFX_WideTextBuf& javascript) {
 }
 
 CXFA_FMNumberExpression::CXFA_FMNumberExpression(uint32_t line,
-                                                 CFX_WideStringC wsNumber)
+                                                 WideStringView wsNumber)
     : CXFA_FMSimpleExpression(line, TOKnumber), m_wsNumber(wsNumber) {}
 
 CXFA_FMNumberExpression::~CXFA_FMNumberExpression() {}
@@ -121,13 +121,13 @@ bool CXFA_FMNumberExpression::ToJavaScript(CFX_WideTextBuf& javascript) {
 }
 
 CXFA_FMStringExpression::CXFA_FMStringExpression(uint32_t line,
-                                                 CFX_WideStringC wsString)
+                                                 WideStringView wsString)
     : CXFA_FMSimpleExpression(line, TOKstring), m_wsString(wsString) {}
 
 CXFA_FMStringExpression::~CXFA_FMStringExpression() {}
 
 bool CXFA_FMStringExpression::ToJavaScript(CFX_WideTextBuf& javascript) {
-  CFX_WideString tempStr(m_wsString);
+  WideString tempStr(m_wsString);
   if (tempStr.GetLength() <= 2) {
     javascript << tempStr;
     return true;
@@ -156,14 +156,14 @@ bool CXFA_FMStringExpression::ToJavaScript(CFX_WideTextBuf& javascript) {
 
 CXFA_FMIdentifierExpression::CXFA_FMIdentifierExpression(
     uint32_t line,
-    CFX_WideStringC wsIdentifier)
+    WideStringView wsIdentifier)
     : CXFA_FMSimpleExpression(line, TOKidentifier),
       m_wsIdentifier(wsIdentifier) {}
 
 CXFA_FMIdentifierExpression::~CXFA_FMIdentifierExpression() {}
 
 bool CXFA_FMIdentifierExpression::ToJavaScript(CFX_WideTextBuf& javascript) {
-  CFX_WideString tempStr(m_wsIdentifier);
+  WideString tempStr(m_wsIdentifier);
   if (tempStr == L"$") {
     tempStr = L"this";
   } else if (tempStr == L"!") {
@@ -244,7 +244,7 @@ bool CXFA_FMAssignExpression::ToJavaScript(CFX_WideTextBuf& javascript) {
   javascript << tempExp2;
   javascript << L");\n}\n";
   if (m_pExp1->GetOperatorToken() == TOKidentifier &&
-      tempExp1.AsStringC() != L"this") {
+      tempExp1.AsStringView() != L"this") {
     javascript << L"else\n{\n";
     javascript << tempExp1;
     javascript << L" = ";
@@ -282,7 +282,7 @@ bool CXFA_FMAssignExpression::ToImpliedReturnJS(CFX_WideTextBuf& javascript) {
   javascript << tempExp2;
   javascript << L");\n}\n";
   if (m_pExp1->GetOperatorToken() == TOKidentifier &&
-      tempExp1.AsStringC() != L"this") {
+      tempExp1.AsStringView() != L"this") {
     javascript << L"else\n{\n";
     javascript << RUNTIMEFUNCTIONRETURNVALUE;
     javascript << L" = ";
@@ -522,10 +522,10 @@ bool CXFA_FMCallExpression::IsBuiltInFunc(CFX_WideTextBuf* funcName) {
   if (funcName->GetLength() > g_BuiltInFuncsMaxLen)
     return false;
 
-  auto cmpFunc = [](const wchar_t* iter, const CFX_WideString& val) -> bool {
+  auto cmpFunc = [](const wchar_t* iter, const WideString& val) -> bool {
     return val.CompareNoCase(iter) > 0;
   };
-  CFX_WideString str = funcName->MakeString();
+  WideString str = funcName->MakeString();
   const wchar_t* const* pMatchResult = std::lower_bound(
       std::begin(g_BuiltInFuncs), std::end(g_BuiltInFuncs), str, cmpFunc);
   if (pMatchResult != std::end(g_BuiltInFuncs) &&
@@ -538,8 +538,8 @@ bool CXFA_FMCallExpression::IsBuiltInFunc(CFX_WideTextBuf* funcName) {
 }
 
 uint32_t CXFA_FMCallExpression::IsMethodWithObjParam(
-    const CFX_WideString& methodName) {
-  auto cmpFunc = [](const XFA_FMSOMMethod iter, const CFX_WideString& val) {
+    const WideString& methodName) {
+  auto cmpFunc = [](const XFA_FMSOMMethod iter, const WideString& val) {
     return val.Compare(iter.m_wsSomMethodName) > 0;
   };
   const XFA_FMSOMMethod* result =
@@ -599,12 +599,12 @@ bool CXFA_FMCallExpression::ToJavaScript(CFX_WideTextBuf& javascript) {
     bool isEvalFunc = false;
     bool isExistsFunc = false;
     if (IsBuiltInFunc(&funcName)) {
-      if (funcName.AsStringC() == L"Eval") {
+      if (funcName.AsStringView() == L"Eval") {
         isEvalFunc = true;
         javascript << L"eval.call(this, ";
         javascript << gs_lpStrExpFuncName[CALL];
         javascript << L"Translate";
-      } else if (funcName.AsStringC() == L"Exists") {
+      } else if (funcName.AsStringView() == L"Exists") {
         isExistsFunc = true;
         javascript << gs_lpStrExpFuncName[CALL];
         javascript << funcName;
@@ -655,7 +655,7 @@ CXFA_FMDotAccessorExpression::CXFA_FMDotAccessorExpression(
     uint32_t line,
     std::unique_ptr<CXFA_FMSimpleExpression> pAccessor,
     XFA_FM_TOKEN op,
-    CFX_WideStringC wsIdentifier,
+    WideStringView wsIdentifier,
     std::unique_ptr<CXFA_FMSimpleExpression> pIndexExp)
     : CXFA_FMBinExpression(line,
                            op,
@@ -745,7 +745,7 @@ CXFA_FMDotDotAccessorExpression::CXFA_FMDotDotAccessorExpression(
     uint32_t line,
     std::unique_ptr<CXFA_FMSimpleExpression> pAccessor,
     XFA_FM_TOKEN op,
-    CFX_WideStringC wsIdentifier,
+    WideStringView wsIdentifier,
     std::unique_ptr<CXFA_FMSimpleExpression> pIndexExp)
     : CXFA_FMBinExpression(line,
                            op,
diff --git a/xfa/fxfa/fm2js/cxfa_fmsimpleexpression.h b/xfa/fxfa/fm2js/cxfa_fmsimpleexpression.h
index a9e9f90289..864c822a12 100644
--- a/xfa/fxfa/fm2js/cxfa_fmsimpleexpression.h
+++ b/xfa/fxfa/fm2js/cxfa_fmsimpleexpression.h
@@ -45,7 +45,7 @@ enum XFA_FM_SimpleExpressionType {
 
 class CFX_WideTextBuf;
 
-CFX_WideStringC XFA_FM_EXPTypeToString(
+WideStringView XFA_FM_EXPTypeToString(
     XFA_FM_SimpleExpressionType simpleExpType);
 
 enum XFA_FM_AccessorIndex {
@@ -78,32 +78,32 @@ class CXFA_FMNullExpression : public CXFA_FMSimpleExpression {
 
 class CXFA_FMNumberExpression : public CXFA_FMSimpleExpression {
  public:
-  CXFA_FMNumberExpression(uint32_t line, CFX_WideStringC wsNumber);
+  CXFA_FMNumberExpression(uint32_t line, WideStringView wsNumber);
   ~CXFA_FMNumberExpression() override;
   bool ToJavaScript(CFX_WideTextBuf& javascript) override;
 
  private:
-  CFX_WideStringC m_wsNumber;
+  WideStringView m_wsNumber;
 };
 
 class CXFA_FMStringExpression : public CXFA_FMSimpleExpression {
  public:
-  CXFA_FMStringExpression(uint32_t line, CFX_WideStringC wsString);
+  CXFA_FMStringExpression(uint32_t line, WideStringView wsString);
   ~CXFA_FMStringExpression() override;
   bool ToJavaScript(CFX_WideTextBuf& javascript) override;
 
  private:
-  CFX_WideStringC m_wsString;
+  WideStringView m_wsString;
 };
 
 class CXFA_FMIdentifierExpression : public CXFA_FMSimpleExpression {
  public:
-  CXFA_FMIdentifierExpression(uint32_t line, CFX_WideStringC wsIdentifier);
+  CXFA_FMIdentifierExpression(uint32_t line, WideStringView wsIdentifier);
   ~CXFA_FMIdentifierExpression() override;
   bool ToJavaScript(CFX_WideTextBuf& javascript) override;
 
  private:
-  CFX_WideStringC m_wsIdentifier;
+  WideStringView m_wsIdentifier;
 };
 
 class CXFA_FMUnaryExpression : public CXFA_FMSimpleExpression {
@@ -240,7 +240,7 @@ class CXFA_FMCallExpression : public CXFA_FMUnaryExpression {
   ~CXFA_FMCallExpression() override;
 
   bool IsBuiltInFunc(CFX_WideTextBuf* funcName);
-  uint32_t IsMethodWithObjParam(const CFX_WideString& methodName);
+  uint32_t IsMethodWithObjParam(const WideString& methodName);
   bool ToJavaScript(CFX_WideTextBuf& javascript) override;
 
  private:
@@ -254,13 +254,13 @@ class CXFA_FMDotAccessorExpression : public CXFA_FMBinExpression {
       uint32_t line,
       std::unique_ptr<CXFA_FMSimpleExpression> pAccessor,
       XFA_FM_TOKEN op,
-      CFX_WideStringC wsIdentifier,
+      WideStringView wsIdentifier,
       std::unique_ptr<CXFA_FMSimpleExpression> pIndexExp);
   ~CXFA_FMDotAccessorExpression() override;
   bool ToJavaScript(CFX_WideTextBuf& javascript) override;
 
  private:
-  CFX_WideStringC m_wsIdentifier;
+  WideStringView m_wsIdentifier;
 };
 
 class CXFA_FMIndexExpression : public CXFA_FMUnaryExpression {
@@ -283,14 +283,14 @@ class CXFA_FMDotDotAccessorExpression : public CXFA_FMBinExpression {
       uint32_t line,
       std::unique_ptr<CXFA_FMSimpleExpression> pAccessor,
       XFA_FM_TOKEN op,
-      CFX_WideStringC wsIdentifier,
+      WideStringView wsIdentifier,
       std::unique_ptr<CXFA_FMSimpleExpression> pIndexExp);
   ~CXFA_FMDotDotAccessorExpression() override;
 
   bool ToJavaScript(CFX_WideTextBuf& javascript) override;
 
  private:
-  CFX_WideStringC m_wsIdentifier;
+  WideStringView m_wsIdentifier;
 };
 
 class CXFA_FMMethodCallExpression : public CXFA_FMBinExpression {
diff --git a/xfa/fxfa/fm2js/cxfa_fmsimpleexpression_unittest.cpp b/xfa/fxfa/fm2js/cxfa_fmsimpleexpression_unittest.cpp
index 58ddbac806..5f4d83c327 100644
--- a/xfa/fxfa/fm2js/cxfa_fmsimpleexpression_unittest.cpp
+++ b/xfa/fxfa/fm2js/cxfa_fmsimpleexpression_unittest.cpp
@@ -27,7 +27,7 @@ TEST(FMCallExpressionTest, more_than_32_arguments) {
   callExp.ToJavaScript(js);
 
   // Generate the result javascript string.
-  CFX_WideString result = L"sign(";
+  WideString result = L"sign(";
   for (size_t i = 0; i < 50; i++) {
     if (i > 0)
       result += L", ";
@@ -41,31 +41,31 @@ TEST(FMCallExpressionTest, more_than_32_arguments) {
   }
   result += L")";
 
-  EXPECT_EQ(result.AsStringC(), js.AsStringC());
+  EXPECT_EQ(result.AsStringView(), js.AsStringView());
 }
 
 TEST(FMStringExpressionTest, Empty) {
   CFX_WideTextBuf accumulator;
-  CXFA_FMStringExpression(1, CFX_WideStringC()).ToJavaScript(accumulator);
-  EXPECT_EQ(L"", accumulator.AsStringC());
+  CXFA_FMStringExpression(1, WideStringView()).ToJavaScript(accumulator);
+  EXPECT_EQ(L"", accumulator.AsStringView());
 }
 
 TEST(FMStringExpressionTest, Short) {
   CFX_WideTextBuf accumulator;
   CXFA_FMStringExpression(1, L"a").ToJavaScript(accumulator);
-  EXPECT_EQ(L"a", accumulator.AsStringC());
+  EXPECT_EQ(L"a", accumulator.AsStringView());
 }
 
 TEST(FMStringExpressionTest, Medium) {
   CFX_WideTextBuf accumulator;
   CXFA_FMStringExpression(1, L".abcd.").ToJavaScript(accumulator);
-  EXPECT_EQ(L"\"abcd\"", accumulator.AsStringC());
+  EXPECT_EQ(L"\"abcd\"", accumulator.AsStringView());
 }
 
 TEST(FMStringExpressionTest, Long) {
   CFX_WideTextBuf accumulator;
-  std::vector<CFX_WideStringC::UnsignedType> vec(140000, L'A');
-  CXFA_FMStringExpression(1, CFX_WideStringC(vec)).ToJavaScript(accumulator);
+  std::vector<WideStringView::UnsignedType> vec(140000, L'A');
+  CXFA_FMStringExpression(1, WideStringView(vec)).ToJavaScript(accumulator);
   EXPECT_EQ(140000u, accumulator.GetLength());
 }
 
@@ -73,5 +73,5 @@ TEST(FMStringExpressionTest, Quoted) {
   CFX_WideTextBuf accumulator;
   CXFA_FMStringExpression(1, L".Simon says \"\"run\"\".")
       .ToJavaScript(accumulator);
-  EXPECT_EQ(L"\"Simon says \\\"run\\\"\"", accumulator.AsStringC());
+  EXPECT_EQ(L"\"Simon says \\\"run\\\"\"", accumulator.AsStringView());
 }
diff --git a/xfa/fxfa/fxfa.h b/xfa/fxfa/fxfa.h
index dfd4f343d4..b8595d41dd 100644
--- a/xfa/fxfa/fxfa.h
+++ b/xfa/fxfa/fxfa.h
@@ -114,22 +114,22 @@ class IXFA_AppProvider {
   /**
    * Returns the language of the running host application. Such as zh_CN
    */
-  virtual CFX_WideString GetLanguage() = 0;
+  virtual WideString GetLanguage() = 0;
 
   /**
    * Returns the platform of the machine running the script. Such as WIN
    */
-  virtual CFX_WideString GetPlatform() = 0;
+  virtual WideString GetPlatform() = 0;
 
   /**
    * Get application name, such as Phantom.
    */
-  virtual CFX_WideString GetAppName() = 0;
+  virtual WideString GetAppName() = 0;
 
   /**
    * Get application message box title.
    */
-  virtual CFX_WideString GetAppTitle() const = 0;
+  virtual WideString GetAppTitle() const = 0;
 
   /**
    * Causes the system to play a sound.
@@ -147,8 +147,8 @@ class IXFA_AppProvider {
    * @return A valid integer representing the value of the button pressed by the
    * user, refer to XFA_ID.
    */
-  virtual int32_t MsgBox(const CFX_WideString& wsMessage,
-                         const CFX_WideString& wsTitle = L"",
+  virtual int32_t MsgBox(const WideString& wsMessage,
+                         const WideString& wsTitle = L"",
                          uint32_t dwIconType = 0,
                          uint32_t dwButtonType = 0) = 0;
 
@@ -160,10 +160,10 @@ class IXFA_AppProvider {
    * @param[in] bMask           - Mask the user input with asterisks when true,
    * @return A string containing the user's response.
    */
-  virtual CFX_WideString Response(const CFX_WideString& wsQuestion,
-                                  const CFX_WideString& wsTitle = L"",
-                                  const CFX_WideString& wsDefaultAnswer = L"",
-                                  bool bMask = true) = 0;
+  virtual WideString Response(const WideString& wsQuestion,
+                              const WideString& wsTitle = L"",
+                              const WideString& wsDefaultAnswer = L"",
+                              bool bMask = true) = 0;
 
   /**
    * Download something from somewhere.
@@ -171,7 +171,7 @@ class IXFA_AppProvider {
    * "http://www.w3.org/TR/REC-xml-names/".
    */
   virtual CFX_RetainPtr<IFX_SeekableReadStream> DownloadURL(
-      const CFX_WideString& wsURL) = 0;
+      const WideString& wsURL) = 0;
 
   /**
    * POST data to the given url.
@@ -188,12 +188,12 @@ class IXFA_AppProvider {
    * @param[out] wsResponse   decoded response from server.
    * @return true Server permitted the post request, false otherwise.
    */
-  virtual bool PostRequestURL(const CFX_WideString& wsURL,
-                              const CFX_WideString& wsData,
-                              const CFX_WideString& wsContentType,
-                              const CFX_WideString& wsEncode,
-                              const CFX_WideString& wsHeader,
-                              CFX_WideString& wsResponse) = 0;
+  virtual bool PostRequestURL(const WideString& wsURL,
+                              const WideString& wsData,
+                              const WideString& wsContentType,
+                              const WideString& wsEncode,
+                              const WideString& wsHeader,
+                              WideString& wsResponse) = 0;
 
   /**
    * PUT data to the given url.
@@ -203,9 +203,9 @@ class IXFA_AppProvider {
    * ISO8859-1, any recognized [IANA]character encoding
    * @return true Server permitted the post request, false otherwise.
    */
-  virtual bool PutRequestURL(const CFX_WideString& wsURL,
-                             const CFX_WideString& wsData,
-                             const CFX_WideString& wsEncode) = 0;
+  virtual bool PutRequestURL(const WideString& wsURL,
+                             const WideString& wsData,
+                             const WideString& wsEncode) = 0;
 
   virtual IFWL_AdapterTimerMgr* GetTimerMgr() = 0;
 };
@@ -237,12 +237,12 @@ class IXFA_DocEnvironment {
   virtual void SetCurrentPage(CXFA_FFDoc* hDoc, int32_t iCurPage) = 0;
   virtual bool IsCalculationsEnabled(CXFA_FFDoc* hDoc) = 0;
   virtual void SetCalculationsEnabled(CXFA_FFDoc* hDoc, bool bEnabled) = 0;
-  virtual void GetTitle(CXFA_FFDoc* hDoc, CFX_WideString& wsTitle) = 0;
-  virtual void SetTitle(CXFA_FFDoc* hDoc, const CFX_WideString& wsTitle) = 0;
+  virtual void GetTitle(CXFA_FFDoc* hDoc, WideString& wsTitle) = 0;
+  virtual void SetTitle(CXFA_FFDoc* hDoc, const WideString& wsTitle) = 0;
   virtual void ExportData(CXFA_FFDoc* hDoc,
-                          const CFX_WideString& wsFilePath,
+                          const WideString& wsFilePath,
                           bool bXDP) = 0;
-  virtual void GotoURL(CXFA_FFDoc* hDoc, const CFX_WideString& bsURL) = 0;
+  virtual void GotoURL(CXFA_FFDoc* hDoc, const WideString& bsURL) = 0;
   virtual bool IsValidationsEnabled(CXFA_FFDoc* hDoc) = 0;
   virtual void SetValidationsEnabled(CXFA_FFDoc* hDoc, bool bEnabled) = 0;
   virtual void SetFocusWidget(CXFA_FFDoc* hDoc, CXFA_FFWidget* hWidget) = 0;
@@ -254,14 +254,14 @@ class IXFA_DocEnvironment {
 
   virtual bool SubmitData(CXFA_FFDoc* hDoc, CXFA_Submit submit) = 0;
   virtual bool GetGlobalProperty(CXFA_FFDoc* hDoc,
-                                 const CFX_ByteStringC& szPropName,
+                                 const ByteStringView& szPropName,
                                  CFXJSE_Value* pValue) = 0;
   virtual bool SetGlobalProperty(CXFA_FFDoc* hDoc,
-                                 const CFX_ByteStringC& szPropName,
+                                 const ByteStringView& szPropName,
                                  CFXJSE_Value* pValue) = 0;
   virtual CFX_RetainPtr<IFX_SeekableReadStream> OpenLinkedFile(
       CXFA_FFDoc* hDoc,
-      const CFX_WideString& wsLink) = 0;
+      const WideString& wsLink) = 0;
 };
 
 class IXFA_WidgetIterator {
diff --git a/xfa/fxfa/parser/cscript_datawindow.cpp b/xfa/fxfa/parser/cscript_datawindow.cpp
index e2d9f043d1..c5b09d155b 100644
--- a/xfa/fxfa/parser/cscript_datawindow.cpp
+++ b/xfa/fxfa/parser/cscript_datawindow.cpp
@@ -15,7 +15,7 @@ CScript_DataWindow::CScript_DataWindow(CXFA_Document* pDocument)
     : CXFA_Object(pDocument,
                   XFA_ObjectType::Object,
                   XFA_Element::DataWindow,
-                  CFX_WideStringC(L"dataWindow")) {}
+                  WideStringView(L"dataWindow")) {}
 
 CScript_DataWindow::~CScript_DataWindow() {}
 
diff --git a/xfa/fxfa/parser/cscript_eventpseudomodel.cpp b/xfa/fxfa/parser/cscript_eventpseudomodel.cpp
index 45f1171321..ecf2a98915 100644
--- a/xfa/fxfa/parser/cscript_eventpseudomodel.cpp
+++ b/xfa/fxfa/parser/cscript_eventpseudomodel.cpp
@@ -17,14 +17,12 @@
 
 namespace {
 
-void StringProperty(CFXJSE_Value* pValue,
-                    CFX_WideString& wsValue,
-                    bool bSetting) {
+void StringProperty(CFXJSE_Value* pValue, WideString& wsValue, bool bSetting) {
   if (bSetting) {
     wsValue = pValue->ToWideString();
     return;
   }
-  pValue->SetString(wsValue.UTF8Encode().AsStringC());
+  pValue->SetString(wsValue.UTF8Encode().AsStringView());
 }
 
 void InterProperty(CFXJSE_Value* pValue, int32_t& iValue, bool bSetting) {
@@ -49,7 +47,7 @@ CScript_EventPseudoModel::CScript_EventPseudoModel(CXFA_Document* pDocument)
     : CXFA_Object(pDocument,
                   XFA_ObjectType::Object,
                   XFA_Element::EventPseudoModel,
-                  CFX_WideStringC(L"eventPseudoModel")) {}
+                  WideStringView(L"eventPseudoModel")) {}
 
 CScript_EventPseudoModel::~CScript_EventPseudoModel() {}
 
diff --git a/xfa/fxfa/parser/cscript_hostpseudomodel.cpp b/xfa/fxfa/parser/cscript_hostpseudomodel.cpp
index 2db6677877..f1eaff8c93 100644
--- a/xfa/fxfa/parser/cscript_hostpseudomodel.cpp
+++ b/xfa/fxfa/parser/cscript_hostpseudomodel.cpp
@@ -30,7 +30,7 @@ CScript_HostPseudoModel::CScript_HostPseudoModel(CXFA_Document* pDocument)
     : CXFA_Object(pDocument,
                   XFA_ObjectType::Object,
                   XFA_Element::HostPseudoModel,
-                  CFX_WideStringC(L"hostPseudoModel")) {}
+                  WideStringView(L"hostPseudoModel")) {}
 
 CScript_HostPseudoModel::~CScript_HostPseudoModel() {}
 
@@ -89,7 +89,7 @@ void CScript_HostPseudoModel::Language(CFXJSE_Value* pValue,
     return;
   }
   pValue->SetString(
-      pNotify->GetAppProvider()->GetLanguage().UTF8Encode().AsStringC());
+      pNotify->GetAppProvider()->GetLanguage().UTF8Encode().AsStringView());
 }
 
 void CScript_HostPseudoModel::NumPages(CFXJSE_Value* pValue,
@@ -118,7 +118,7 @@ void CScript_HostPseudoModel::Platform(CFXJSE_Value* pValue,
     return;
   }
   pValue->SetString(
-      pNotify->GetAppProvider()->GetPlatform().UTF8Encode().AsStringC());
+      pNotify->GetAppProvider()->GetPlatform().UTF8Encode().AsStringView());
 }
 
 void CScript_HostPseudoModel::Title(CFXJSE_Value* pValue,
@@ -136,9 +136,9 @@ void CScript_HostPseudoModel::Title(CFXJSE_Value* pValue,
     pNotify->GetDocEnvironment()->SetTitle(hDoc, pValue->ToWideString());
     return;
   }
-  CFX_WideString wsTitle;
+  WideString wsTitle;
   pNotify->GetDocEnvironment()->GetTitle(hDoc, wsTitle);
-  pValue->SetString(wsTitle.UTF8Encode().AsStringC());
+  pValue->SetString(wsTitle.UTF8Encode().AsStringView());
 }
 
 void CScript_HostPseudoModel::ValidationsEnabled(CFXJSE_Value* pValue,
@@ -200,7 +200,7 @@ void CScript_HostPseudoModel::Name(CFXJSE_Value* pValue,
     return;
   }
   pValue->SetString(
-      pNotify->GetAppProvider()->GetAppName().UTF8Encode().AsStringC());
+      pNotify->GetAppProvider()->GetAppName().UTF8Encode().AsStringView());
 }
 
 void CScript_HostPseudoModel::GotoURL(CFXJSE_Arguments* pArguments) {
@@ -217,10 +217,10 @@ void CScript_HostPseudoModel::GotoURL(CFXJSE_Arguments* pArguments) {
     return;
   }
   CXFA_FFDoc* hDoc = pNotify->GetHDOC();
-  CFX_WideString wsURL;
+  WideString wsURL;
   if (iLength >= 1) {
-    CFX_ByteString bsURL = pArguments->GetUTF8String(0);
-    wsURL = CFX_WideString::FromUTF8(bsURL.AsStringC());
+    ByteString bsURL = pArguments->GetUTF8String(0);
+    wsURL = WideString::FromUTF8(bsURL.AsStringView());
   }
   pNotify->GetDocEnvironment()->GotoURL(hDoc, wsURL);
 }
@@ -256,7 +256,7 @@ void CScript_HostPseudoModel::OpenList(CFXJSE_Arguments* pArguments) {
                         XFA_RESOLVENODE_Siblings;
       XFA_RESOLVENODE_RS resoveNodeRS;
       int32_t iRet = pScriptContext->ResolveObjects(
-          pObject, pValue->ToWideString().AsStringC(), resoveNodeRS, dwFlag);
+          pObject, pValue->ToWideString().AsStringView(), resoveNodeRS, dwFlag);
       if (iRet < 1 || !resoveNodeRS.objects.front()->IsNode())
         return;
 
@@ -285,39 +285,39 @@ void CScript_HostPseudoModel::Response(CFXJSE_Arguments* pArguments) {
   if (!pNotify) {
     return;
   }
-  CFX_WideString wsQuestion;
-  CFX_WideString wsTitle;
-  CFX_WideString wsDefaultAnswer;
+  WideString wsQuestion;
+  WideString wsTitle;
+  WideString wsDefaultAnswer;
   bool bMark = false;
   if (iLength >= 1) {
-    CFX_ByteString bsQuestion = pArguments->GetUTF8String(0);
-    wsQuestion = CFX_WideString::FromUTF8(bsQuestion.AsStringC());
+    ByteString bsQuestion = pArguments->GetUTF8String(0);
+    wsQuestion = WideString::FromUTF8(bsQuestion.AsStringView());
   }
   if (iLength >= 2) {
-    CFX_ByteString bsTitle = pArguments->GetUTF8String(1);
-    wsTitle = CFX_WideString::FromUTF8(bsTitle.AsStringC());
+    ByteString bsTitle = pArguments->GetUTF8String(1);
+    wsTitle = WideString::FromUTF8(bsTitle.AsStringView());
   }
   if (iLength >= 3) {
-    CFX_ByteString bsDefaultAnswer = pArguments->GetUTF8String(2);
-    wsDefaultAnswer = CFX_WideString::FromUTF8(bsDefaultAnswer.AsStringC());
+    ByteString bsDefaultAnswer = pArguments->GetUTF8String(2);
+    wsDefaultAnswer = WideString::FromUTF8(bsDefaultAnswer.AsStringView());
   }
   if (iLength >= 4) {
     bMark = pArguments->GetInt32(3) == 0 ? false : true;
   }
-  CFX_WideString wsAnswer = pNotify->GetAppProvider()->Response(
+  WideString wsAnswer = pNotify->GetAppProvider()->Response(
       wsQuestion, wsTitle, wsDefaultAnswer, bMark);
   CFXJSE_Value* pValue = pArguments->GetReturnValue();
   if (pValue)
-    pValue->SetString(wsAnswer.UTF8Encode().AsStringC());
+    pValue->SetString(wsAnswer.UTF8Encode().AsStringView());
 }
 
 void CScript_HostPseudoModel::DocumentInBatch(CFXJSE_Arguments* pArguments) {
   if (CFXJSE_Value* pValue = pArguments->GetReturnValue())
     pValue->SetInteger(0);
 }
-static int32_t XFA_FilterName(const CFX_WideStringC& wsExpression,
+static int32_t XFA_FilterName(const WideStringView& wsExpression,
                               int32_t nStart,
-                              CFX_WideString& wsFilter) {
+                              WideString& wsFilter) {
   ASSERT(nStart > -1);
   int32_t iLength = wsExpression.GetLength();
   if (nStart >= iLength) {
@@ -349,21 +349,21 @@ void CScript_HostPseudoModel::ResetData(CFXJSE_Arguments* pArguments) {
   if (!pNotify) {
     return;
   }
-  CFX_WideString wsExpression;
+  WideString wsExpression;
   if (iLength >= 1) {
-    CFX_ByteString bsExpression = pArguments->GetUTF8String(0);
-    wsExpression = CFX_WideString::FromUTF8(bsExpression.AsStringC());
+    ByteString bsExpression = pArguments->GetUTF8String(0);
+    wsExpression = WideString::FromUTF8(bsExpression.AsStringView());
   }
   if (wsExpression.IsEmpty()) {
     pNotify->ResetData();
     return;
   }
   int32_t iStart = 0;
-  CFX_WideString wsName;
+  WideString wsName;
   CXFA_Node* pNode = nullptr;
   int32_t iExpLength = wsExpression.GetLength();
   while (iStart < iExpLength) {
-    iStart = XFA_FilterName(wsExpression.AsStringC(), iStart, wsName);
+    iStart = XFA_FilterName(wsExpression.AsStringView(), iStart, wsName);
     CXFA_ScriptContext* pScriptContext = m_pDocument->GetScriptContext();
     if (!pScriptContext)
       return;
@@ -375,8 +375,8 @@ void CScript_HostPseudoModel::ResetData(CFXJSE_Arguments* pArguments) {
     uint32_t dwFlag = XFA_RESOLVENODE_Children | XFA_RESOLVENODE_Parent |
                       XFA_RESOLVENODE_Siblings;
     XFA_RESOLVENODE_RS resoveNodeRS;
-    int32_t iRet = pScriptContext->ResolveObjects(pObject, wsName.AsStringC(),
-                                                  resoveNodeRS, dwFlag);
+    int32_t iRet = pScriptContext->ResolveObjects(
+        pObject, wsName.AsStringView(), resoveNodeRS, dwFlag);
     if (iRet < 1 || !resoveNodeRS.objects.front()->IsNode()) {
       continue;
     }
@@ -437,7 +437,7 @@ void CScript_HostPseudoModel::SetFocus(CFXJSE_Arguments* pArguments) {
                         XFA_RESOLVENODE_Siblings;
       XFA_RESOLVENODE_RS resoveNodeRS;
       int32_t iRet = pScriptContext->ResolveObjects(
-          pObject, pValue->ToWideString().AsStringC(), resoveNodeRS, dwFlag);
+          pObject, pValue->ToWideString().AsStringView(), resoveNodeRS, dwFlag);
       if (iRet < 1 || !resoveNodeRS.objects.front()->IsNode())
         return;
 
@@ -472,8 +472,8 @@ void CScript_HostPseudoModel::MessageBox(CFXJSE_Arguments* pArguments) {
   if (!pNotify) {
     return;
   }
-  CFX_WideString wsMessage;
-  CFX_WideString bsTitle;
+  WideString wsMessage;
+  WideString bsTitle;
   uint32_t dwMessageType = XFA_MBICON_Error;
   uint32_t dwButtonType = XFA_MB_OK;
   if (iLength >= 1) {
@@ -506,7 +506,7 @@ void CScript_HostPseudoModel::MessageBox(CFXJSE_Arguments* pArguments) {
 }
 bool CScript_HostPseudoModel::ValidateArgsForMsg(CFXJSE_Arguments* pArguments,
                                                  int32_t iArgIndex,
-                                                 CFX_WideString& wsValue) {
+                                                 WideString& wsValue) {
   if (!pArguments || iArgIndex < 0) {
     return false;
   }
@@ -621,11 +621,11 @@ void CScript_HostPseudoModel::ExportData(CFXJSE_Arguments* pArguments) {
     return;
   }
   CXFA_FFDoc* hDoc = pNotify->GetHDOC();
-  CFX_WideString wsFilePath;
+  WideString wsFilePath;
   bool bXDP = true;
   if (iLength >= 1) {
-    CFX_ByteString bsFilePath = pArguments->GetUTF8String(0);
-    wsFilePath = CFX_WideString::FromUTF8(bsFilePath.AsStringC());
+    ByteString bsFilePath = pArguments->GetUTF8String(0);
+    wsFilePath = WideString::FromUTF8(bsFilePath.AsStringView());
   }
   if (iLength >= 2) {
     bXDP = pArguments->GetInt32(1) == 0 ? false : true;
@@ -673,10 +673,10 @@ void CScript_HostPseudoModel::CurrentDateTime(CFXJSE_Arguments* pArguments) {
   if (!pNotify) {
     return;
   }
-  CFX_WideString wsDataTime = pNotify->GetCurrentDateTime();
+  WideString wsDataTime = pNotify->GetCurrentDateTime();
   CFXJSE_Value* pValue = pArguments->GetReturnValue();
   if (pValue)
-    pValue->SetString(wsDataTime.UTF8Encode().AsStringC());
+    pValue->SetString(wsDataTime.UTF8Encode().AsStringView());
 }
 
 void CScript_HostPseudoModel::ThrowSetLanguageException() const {
diff --git a/xfa/fxfa/parser/cscript_hostpseudomodel.h b/xfa/fxfa/parser/cscript_hostpseudomodel.h
index 821f88d137..4ec92dd73a 100644
--- a/xfa/fxfa/parser/cscript_hostpseudomodel.h
+++ b/xfa/fxfa/parser/cscript_hostpseudomodel.h
@@ -54,7 +54,7 @@ class CScript_HostPseudoModel : public CXFA_Object {
  private:
   bool ValidateArgsForMsg(CFXJSE_Arguments* pArguments,
                           int32_t iArgIndex,
-                          CFX_WideString& wsValue);
+                          WideString& wsValue);
   void ThrowSetLanguageException() const;
   void ThrowSetNumPagesException() const;
   void ThrowSetPlatformException() const;
diff --git a/xfa/fxfa/parser/cscript_layoutpseudomodel.cpp b/xfa/fxfa/parser/cscript_layoutpseudomodel.cpp
index 46db2ca78c..e35a3b8aa0 100644
--- a/xfa/fxfa/parser/cscript_layoutpseudomodel.cpp
+++ b/xfa/fxfa/parser/cscript_layoutpseudomodel.cpp
@@ -28,7 +28,7 @@ CScript_LayoutPseudoModel::CScript_LayoutPseudoModel(CXFA_Document* pDocument)
     : CXFA_Object(pDocument,
                   XFA_ObjectType::Object,
                   XFA_Element::LayoutPseudoModel,
-                  CFX_WideStringC(L"layoutPseudoModel")) {}
+                  WideStringView(L"layoutPseudoModel")) {}
 
 CScript_LayoutPseudoModel::~CScript_LayoutPseudoModel() {}
 
@@ -73,11 +73,11 @@ void CScript_LayoutPseudoModel::HWXY(CFXJSE_Arguments* pArguments,
   if (!pNode)
     return;
 
-  CFX_WideString wsUnit(L"pt");
+  WideString wsUnit(L"pt");
   if (iLength >= 2) {
-    CFX_ByteString bsUnit = pArguments->GetUTF8String(1);
+    ByteString bsUnit = pArguments->GetUTF8String(1);
     if (!bsUnit.IsEmpty())
-      wsUnit = CFX_WideString::FromUTF8(bsUnit.AsStringC());
+      wsUnit = WideString::FromUTF8(bsUnit.AsStringView());
   }
 
   int32_t iIndex = iLength >= 3 ? pArguments->GetInt32(2) : 0;
@@ -116,8 +116,8 @@ void CScript_LayoutPseudoModel::HWXY(CFXJSE_Arguments* pArguments,
       measure.Set(rtRect.top, XFA_UNIT_Pt);
       break;
   }
-  float fValue =
-      measure.ToUnit(CXFA_Measurement::GetUnitFromString(wsUnit.AsStringC()));
+  float fValue = measure.ToUnit(
+      CXFA_Measurement::GetUnitFromString(wsUnit.AsStringView()));
   fValue = FXSYS_round(fValue * 1000) / 1000.0f;
   pValue->SetFloat(fValue);
 }
@@ -203,7 +203,7 @@ void CScript_LayoutPseudoModel::Page(CFXJSE_Arguments* pArguments) {
 std::vector<CXFA_Node*> CScript_LayoutPseudoModel::GetObjArray(
     CXFA_LayoutProcessor* pDocLayout,
     int32_t iPageNo,
-    const CFX_WideString& wsType,
+    const WideString& wsType,
     bool bOnPageArea) {
   CXFA_ContainerLayoutItem* pLayoutPage = pDocLayout->GetPage(iPageNo);
   if (!pLayoutPage)
@@ -338,14 +338,14 @@ void CScript_LayoutPseudoModel::PageContent(CFXJSE_Arguments* pArguments) {
     return;
   }
   int32_t iIndex = 0;
-  CFX_WideString wsType;
+  WideString wsType;
   bool bOnPageArea = false;
   if (iLength >= 1)
     iIndex = pArguments->GetInt32(0);
 
   if (iLength >= 2) {
-    CFX_ByteString bsType = pArguments->GetUTF8String(1);
-    wsType = CFX_WideString::FromUTF8(bsType.AsStringC());
+    ByteString bsType = pArguments->GetUTF8String(1);
+    wsType = WideString::FromUTF8(bsType.AsStringView());
   }
   if (iLength >= 3)
     bOnPageArea = pArguments->GetInt32(2) == 0 ? false : true;
diff --git a/xfa/fxfa/parser/cscript_layoutpseudomodel.h b/xfa/fxfa/parser/cscript_layoutpseudomodel.h
index 6f98997b0d..539fcce4ca 100644
--- a/xfa/fxfa/parser/cscript_layoutpseudomodel.h
+++ b/xfa/fxfa/parser/cscript_layoutpseudomodel.h
@@ -53,7 +53,7 @@ class CScript_LayoutPseudoModel : public CXFA_Object {
  private:
   std::vector<CXFA_Node*> GetObjArray(CXFA_LayoutProcessor* pDocLayout,
                                       int32_t iPageNo,
-                                      const CFX_WideString& wsType,
+                                      const WideString& wsType,
                                       bool bOnPageArea);
 
   void PageInternals(CFXJSE_Arguments* pArguments, bool bAbsPage);
diff --git a/xfa/fxfa/parser/cscript_logpseudomodel.cpp b/xfa/fxfa/parser/cscript_logpseudomodel.cpp
index d9563ac93e..f0747f4a12 100644
--- a/xfa/fxfa/parser/cscript_logpseudomodel.cpp
+++ b/xfa/fxfa/parser/cscript_logpseudomodel.cpp
@@ -15,7 +15,7 @@ CScript_LogPseudoModel::CScript_LogPseudoModel(CXFA_Document* pDocument)
     : CXFA_Object(pDocument,
                   XFA_ObjectType::Object,
                   XFA_Element::LogPseudoModel,
-                  CFX_WideStringC(L"logPseudoModel")) {}
+                  WideStringView(L"logPseudoModel")) {}
 
 CScript_LogPseudoModel::~CScript_LogPseudoModel() {}
 
diff --git a/xfa/fxfa/parser/cscript_signaturepseudomodel.cpp b/xfa/fxfa/parser/cscript_signaturepseudomodel.cpp
index c746a4e76f..a1136b1ddf 100644
--- a/xfa/fxfa/parser/cscript_signaturepseudomodel.cpp
+++ b/xfa/fxfa/parser/cscript_signaturepseudomodel.cpp
@@ -18,7 +18,7 @@ CScript_SignaturePseudoModel::CScript_SignaturePseudoModel(
     : CXFA_Object(pDocument,
                   XFA_ObjectType::Object,
                   XFA_Element::SignaturePseudoModel,
-                  CFX_WideStringC(L"signaturePseudoModel")) {}
+                  WideStringView(L"signaturePseudoModel")) {}
 
 CScript_SignaturePseudoModel::~CScript_SignaturePseudoModel() {}
 
diff --git a/xfa/fxfa/parser/cxfa_bind.cpp b/xfa/fxfa/parser/cxfa_bind.cpp
index aac2c18321..72373ae571 100644
--- a/xfa/fxfa/parser/cxfa_bind.cpp
+++ b/xfa/fxfa/parser/cxfa_bind.cpp
@@ -10,7 +10,7 @@
 
 CXFA_Bind::CXFA_Bind(CXFA_Node* pNode) : CXFA_Data(pNode) {}
 
-void CXFA_Bind::GetPicture(CFX_WideString& wsPicture) {
+void CXFA_Bind::GetPicture(WideString& wsPicture) {
   if (CXFA_Node* pPicture = m_pNode->GetChild(0, XFA_Element::Picture))
     pPicture->TryContent(wsPicture);
 }
diff --git a/xfa/fxfa/parser/cxfa_bind.h b/xfa/fxfa/parser/cxfa_bind.h
index 40a2a1a482..b24e6f8769 100644
--- a/xfa/fxfa/parser/cxfa_bind.h
+++ b/xfa/fxfa/parser/cxfa_bind.h
@@ -16,7 +16,7 @@ class CXFA_Bind : public CXFA_Data {
  public:
   explicit CXFA_Bind(CXFA_Node* pNode);
 
-  void GetPicture(CFX_WideString& wsPicture);
+  void GetPicture(WideString& wsPicture);
 };
 
 #endif  // XFA_FXFA_PARSER_CXFA_BIND_H_
diff --git a/xfa/fxfa/parser/cxfa_binditems.cpp b/xfa/fxfa/parser/cxfa_binditems.cpp
index c3c5cabe4e..c6dbdb3b02 100644
--- a/xfa/fxfa/parser/cxfa_binditems.cpp
+++ b/xfa/fxfa/parser/cxfa_binditems.cpp
@@ -10,18 +10,18 @@
 
 CXFA_BindItems::CXFA_BindItems(CXFA_Node* pNode) : CXFA_Data(pNode) {}
 
-void CXFA_BindItems::GetLabelRef(CFX_WideStringC& wsLabelRef) {
+void CXFA_BindItems::GetLabelRef(WideStringView& wsLabelRef) {
   m_pNode->TryCData(XFA_ATTRIBUTE_LabelRef, wsLabelRef);
 }
 
-void CXFA_BindItems::GetValueRef(CFX_WideStringC& wsValueRef) {
+void CXFA_BindItems::GetValueRef(WideStringView& wsValueRef) {
   m_pNode->TryCData(XFA_ATTRIBUTE_ValueRef, wsValueRef);
 }
 
-void CXFA_BindItems::GetRef(CFX_WideStringC& wsRef) {
+void CXFA_BindItems::GetRef(WideStringView& wsRef) {
   m_pNode->TryCData(XFA_ATTRIBUTE_Ref, wsRef);
 }
 
-bool CXFA_BindItems::SetConnection(const CFX_WideString& wsConnection) {
+bool CXFA_BindItems::SetConnection(const WideString& wsConnection) {
   return m_pNode->SetCData(XFA_ATTRIBUTE_Connection, wsConnection);
 }
diff --git a/xfa/fxfa/parser/cxfa_binditems.h b/xfa/fxfa/parser/cxfa_binditems.h
index 191941a3fb..58e50da8ee 100644
--- a/xfa/fxfa/parser/cxfa_binditems.h
+++ b/xfa/fxfa/parser/cxfa_binditems.h
@@ -16,10 +16,10 @@ class CXFA_BindItems : public CXFA_Data {
  public:
   explicit CXFA_BindItems(CXFA_Node* pNode);
 
-  void GetLabelRef(CFX_WideStringC& wsLabelRef);
-  void GetValueRef(CFX_WideStringC& wsValueRef);
-  void GetRef(CFX_WideStringC& wsRef);
-  bool SetConnection(const CFX_WideString& wsConnection);
+  void GetLabelRef(WideStringView& wsLabelRef);
+  void GetValueRef(WideStringView& wsValueRef);
+  void GetRef(WideStringView& wsRef);
+  bool SetConnection(const WideString& wsConnection);
 };
 
 #endif  // XFA_FXFA_PARSER_CXFA_BINDITEMS_H_
diff --git a/xfa/fxfa/parser/cxfa_calculate.cpp b/xfa/fxfa/parser/cxfa_calculate.cpp
index bc89d81777..3b0f038f6a 100644
--- a/xfa/fxfa/parser/cxfa_calculate.cpp
+++ b/xfa/fxfa/parser/cxfa_calculate.cpp
@@ -21,7 +21,7 @@ CXFA_Script CXFA_Calculate::GetScript() {
   return CXFA_Script(m_pNode->GetChild(0, XFA_Element::Script));
 }
 
-void CXFA_Calculate::GetMessageText(CFX_WideString& wsMessage) {
+void CXFA_Calculate::GetMessageText(WideString& wsMessage) {
   CXFA_Node* pNode = m_pNode->GetChild(0, XFA_Element::Message);
   if (!pNode)
     return;
diff --git a/xfa/fxfa/parser/cxfa_calculate.h b/xfa/fxfa/parser/cxfa_calculate.h
index 1012224069..b3a6ef2eaa 100644
--- a/xfa/fxfa/parser/cxfa_calculate.h
+++ b/xfa/fxfa/parser/cxfa_calculate.h
@@ -19,7 +19,7 @@ class CXFA_Calculate : public CXFA_Data {
 
   int32_t GetOverride();
   CXFA_Script GetScript();
-  void GetMessageText(CFX_WideString& wsMessage);
+  void GetMessageText(WideString& wsMessage);
 };
 
 #endif  // XFA_FXFA_PARSER_CXFA_CALCULATE_H_
diff --git a/xfa/fxfa/parser/cxfa_data.cpp b/xfa/fxfa/parser/cxfa_data.cpp
index 7bf18a5d3e..5a82ce36cb 100644
--- a/xfa/fxfa/parser/cxfa_data.cpp
+++ b/xfa/fxfa/parser/cxfa_data.cpp
@@ -11,7 +11,7 @@
 #include "xfa/fxfa/parser/cxfa_node.h"
 
 // Static.
-FX_ARGB CXFA_Data::ToColor(const CFX_WideStringC& wsValue) {
+FX_ARGB CXFA_Data::ToColor(const WideStringView& wsValue) {
   uint8_t r = 0, g = 0, b = 0;
   if (wsValue.GetLength() == 0)
     return 0xff000000;
diff --git a/xfa/fxfa/parser/cxfa_data.h b/xfa/fxfa/parser/cxfa_data.h
index 90b689020b..4a073abcb7 100644
--- a/xfa/fxfa/parser/cxfa_data.h
+++ b/xfa/fxfa/parser/cxfa_data.h
@@ -15,7 +15,7 @@ class CXFA_Node;
 
 class CXFA_Data {
  public:
-  static FX_ARGB ToColor(const CFX_WideStringC& wsValue);
+  static FX_ARGB ToColor(const WideStringView& wsValue);
 
   explicit CXFA_Data(CXFA_Node* pNode) : m_pNode(pNode) {}
 
diff --git a/xfa/fxfa/parser/cxfa_dataexporter.cpp b/xfa/fxfa/parser/cxfa_dataexporter.cpp
index 0af9bd47f1..edc7b23b6b 100644
--- a/xfa/fxfa/parser/cxfa_dataexporter.cpp
+++ b/xfa/fxfa/parser/cxfa_dataexporter.cpp
@@ -22,7 +22,7 @@
 
 namespace {
 
-CFX_WideString ExportEncodeAttribute(const CFX_WideString& str) {
+WideString ExportEncodeAttribute(const WideString& str) {
   CFX_WideTextBuf textBuf;
   int32_t iLen = str.GetLength();
   for (int32_t i = 0; i < iLen; i++) {
@@ -54,7 +54,7 @@ bool IsXMLValidChar(wchar_t ch) {
          (ch >= 0x20 && ch <= 0xD7FF) || (ch >= 0xE000 && ch <= 0xFFFD);
 }
 
-CFX_WideString ExportEncodeContent(const CFX_WideStringC& str) {
+WideString ExportEncodeContent(const WideStringView& str) {
   CFX_WideTextBuf textBuf;
   int32_t iLen = str.GetLength();
   for (int32_t i = 0; i < iLen; i++) {
@@ -87,10 +87,10 @@ CFX_WideString ExportEncodeContent(const CFX_WideStringC& str) {
 
 void SaveAttribute(CXFA_Node* pNode,
                    XFA_ATTRIBUTE eName,
-                   const CFX_WideStringC& wsName,
+                   const WideStringView& wsName,
                    bool bProto,
-                   CFX_WideString& wsOutput) {
-  CFX_WideString wsValue;
+                   WideString& wsOutput) {
+  WideString wsValue;
   if ((!bProto && !pNode->HasAttribute((XFA_ATTRIBUTE)eName, bProto)) ||
       !pNode->GetAttribute((XFA_ATTRIBUTE)eName, wsValue, false)) {
     return;
@@ -121,7 +121,7 @@ bool AttributeSaveInDataModel(CXFA_Node* pNode, XFA_ATTRIBUTE eAttribute) {
 }
 
 bool ContentNodeNeedtoExport(CXFA_Node* pContentNode) {
-  CFX_WideString wsContent;
+  WideString wsContent;
   if (!pContentNode->TryContent(wsContent, false, false))
     return false;
 
@@ -144,12 +144,12 @@ bool ContentNodeNeedtoExport(CXFA_Node* pContentNode) {
 }
 
 void RecognizeXFAVersionNumber(CXFA_Node* pTemplateRoot,
-                               CFX_WideString& wsVersionNumber) {
+                               WideString& wsVersionNumber) {
   wsVersionNumber.clear();
   if (!pTemplateRoot)
     return;
 
-  CFX_WideString wsTemplateNS;
+  WideString wsTemplateNS;
   if (!pTemplateRoot->TryNamespace(wsTemplateNS))
     return;
 
@@ -164,7 +164,7 @@ void RecognizeXFAVersionNumber(CXFA_Node* pTemplateRoot,
 void RegenerateFormFile_Changed(CXFA_Node* pNode,
                                 CFX_WideTextBuf& buf,
                                 bool bSaveXML) {
-  CFX_WideString wsAttrs;
+  WideString wsAttrs;
   int32_t iAttrs = 0;
   const uint8_t* pAttrs =
       XFA_GetElementAttributes(pNode->GetElementType(), iAttrs);
@@ -175,12 +175,12 @@ void RegenerateFormFile_Changed(CXFA_Node* pNode,
         (AttributeSaveInDataModel(pNode, pAttr->eName) && !bSaveXML)) {
       continue;
     }
-    CFX_WideString wsAttr;
+    WideString wsAttr;
     SaveAttribute(pNode, pAttr->eName, pAttr->pName, bSaveXML, wsAttr);
     wsAttrs += wsAttr;
   }
 
-  CFX_WideString wsChildren;
+  WideString wsChildren;
   switch (pNode->GetObjectType()) {
     case XFA_ObjectType::ContentNode: {
       if (!bSaveXML && !ContentNodeNeedtoExport(pNode))
@@ -196,7 +196,7 @@ void RegenerateFormFile_Changed(CXFA_Node* pNode,
       if (!pRawValueNode)
         break;
 
-      CFX_WideString wsContentType;
+      WideString wsContentType;
       pNode->GetAttribute(XFA_ATTRIBUTE_ContentType, wsContentType, false);
       if (pRawValueNode->GetElementType() == XFA_Element::SharpxHTML &&
           wsContentType == L"text/html") {
@@ -215,16 +215,16 @@ void RegenerateFormFile_Changed(CXFA_Node* pNode,
 
         pTempStream->SetCodePage(FX_CODEPAGE_UTF8);
         pRichTextXML->SaveXMLNode(pTempStream);
-        wsChildren += CFX_WideString::FromUTF8(
-            CFX_ByteStringC(pMemStream->GetBuffer(), pMemStream->GetSize()));
+        wsChildren += WideString::FromUTF8(
+            ByteStringView(pMemStream->GetBuffer(), pMemStream->GetSize()));
       } else if (pRawValueNode->GetElementType() == XFA_Element::Sharpxml &&
                  wsContentType == L"text/xml") {
-        CFX_WideString wsRawValue;
+        WideString wsRawValue;
         pRawValueNode->GetAttribute(XFA_ATTRIBUTE_Value, wsRawValue, false);
         if (wsRawValue.IsEmpty())
           break;
 
-        std::vector<CFX_WideString> wsSelTextArray;
+        std::vector<WideString> wsSelTextArray;
         FX_STRSIZE iStart = 0;
         auto iEnd = wsRawValue.Find(L'\n', iStart);
         iEnd = !iEnd.has_value() ? wsRawValue.GetLength() : iEnd;
@@ -241,7 +241,7 @@ void RegenerateFormFile_Changed(CXFA_Node* pNode,
         CXFA_Node* pGrandparentNode =
             pParentNode->GetNodeItem(XFA_NODEITEM_Parent);
         ASSERT(pGrandparentNode);
-        CFX_WideString bodyTagName;
+        WideString bodyTagName;
         bodyTagName = pGrandparentNode->GetCData(XFA_ATTRIBUTE_Name);
         if (bodyTagName.IsEmpty())
           bodyTagName = L"ListBox1";
@@ -252,16 +252,16 @@ void RegenerateFormFile_Changed(CXFA_Node* pNode,
         for (int32_t i = 0; i < pdfium::CollectionSize<int32_t>(wsSelTextArray);
              i++) {
           buf << L"<value\n>";
-          buf << ExportEncodeContent(wsSelTextArray[i].AsStringC());
+          buf << ExportEncodeContent(wsSelTextArray[i].AsStringView());
           buf << L"</value\n>";
         }
         buf << L"</";
         buf << bodyTagName;
         buf << L"\n>";
-        wsChildren += buf.AsStringC();
+        wsChildren += buf.AsStringView();
         buf.Clear();
       } else {
-        CFX_WideStringC wsValue = pRawValueNode->GetCData(XFA_ATTRIBUTE_Value);
+        WideStringView wsValue = pRawValueNode->GetCData(XFA_ATTRIBUTE_Value);
         wsChildren += ExportEncodeContent(wsValue);
       }
       break;
@@ -269,7 +269,7 @@ void RegenerateFormFile_Changed(CXFA_Node* pNode,
     case XFA_ObjectType::TextNode:
     case XFA_ObjectType::NodeC:
     case XFA_ObjectType::NodeV: {
-      CFX_WideStringC wsValue = pNode->GetCData(XFA_ATTRIBUTE_Value);
+      WideStringView wsValue = pNode->GetCData(XFA_ATTRIBUTE_Value);
       wsChildren += ExportEncodeContent(wsValue);
       break;
     }
@@ -286,7 +286,7 @@ void RegenerateFormFile_Changed(CXFA_Node* pNode,
       CXFA_Node* pChildNode = pNode->GetNodeItem(XFA_NODEITEM_FirstChild);
       while (pChildNode) {
         RegenerateFormFile_Changed(pChildNode, newBuf, bSaveXML);
-        wsChildren += newBuf.AsStringC();
+        wsChildren += newBuf.AsStringView();
         newBuf.Clear();
         pChildNode = pChildNode->GetNodeItem(XFA_NODEITEM_NextSibling);
       }
@@ -297,7 +297,7 @@ void RegenerateFormFile_Changed(CXFA_Node* pNode,
         CXFA_Node* pChild = pNode->GetNodeItem(XFA_NODEITEM_FirstChild);
         while (pChild) {
           RegenerateFormFile_Changed(pChild, newBuf, bSaveXML);
-          wsChildren += newBuf.AsStringC();
+          wsChildren += newBuf.AsStringView();
           newBuf.Clear();
           pChild = pChild->GetNodeItem(XFA_NODEITEM_NextSibling);
         }
@@ -307,8 +307,8 @@ void RegenerateFormFile_Changed(CXFA_Node* pNode,
 
   if (!wsChildren.IsEmpty() || !wsAttrs.IsEmpty() ||
       pNode->HasAttribute(XFA_ATTRIBUTE_Name)) {
-    CFX_WideStringC wsElement = pNode->GetClassName();
-    CFX_WideString wsName;
+    WideStringView wsElement = pNode->GetClassName();
+    WideString wsName;
     SaveAttribute(pNode, XFA_ATTRIBUTE_Name, L"name", true, wsName);
     buf << L"<";
     buf << wsElement;
@@ -337,18 +337,18 @@ void RegenerateFormFile_Container(
     RegenerateFormFile_Changed(pNode, buf, bSaveXML);
     FX_STRSIZE nLen = buf.GetLength();
     if (nLen > 0)
-      pStream->WriteString(buf.AsStringC());
+      pStream->WriteString(buf.AsStringView());
     return;
   }
 
-  CFX_WideStringC wsElement(pNode->GetClassName());
+  WideStringView wsElement(pNode->GetClassName());
   pStream->WriteString(L"<");
   pStream->WriteString(wsElement);
 
-  CFX_WideString wsOutput;
+  WideString wsOutput;
   SaveAttribute(pNode, XFA_ATTRIBUTE_Name, L"name", true, wsOutput);
 
-  CFX_WideString wsAttrs;
+  WideString wsAttrs;
   int32_t iAttrs = 0;
   const uint8_t* pAttrs =
       XFA_GetElementAttributes(pNode->GetElementType(), iAttrs);
@@ -358,13 +358,13 @@ void RegenerateFormFile_Container(
     if (pAttr->eName == XFA_ATTRIBUTE_Name)
       continue;
 
-    CFX_WideString wsAttr;
+    WideString wsAttr;
     SaveAttribute(pNode, pAttr->eName, pAttr->pName, false, wsAttr);
     wsOutput += wsAttr;
   }
 
   if (!wsOutput.IsEmpty())
-    pStream->WriteString(wsOutput.AsStringC());
+    pStream->WriteString(wsOutput.AsStringView());
 
   CXFA_Node* pChildNode = pNode->GetNodeItem(XFA_NODEITEM_FirstChild);
   if (pChildNode) {
@@ -391,17 +391,17 @@ void XFA_DataExporter_RegenerateFormFile(
   if (pNode->IsModelNode()) {
     pStream->WriteString(L"<form");
     if (pChecksum) {
-      CFX_WideString wsChecksum = CFX_WideString::FromUTF8(pChecksum);
+      WideString wsChecksum = WideString::FromUTF8(pChecksum);
       pStream->WriteString(L" checksum=\"");
-      pStream->WriteString(wsChecksum.AsStringC());
+      pStream->WriteString(wsChecksum.AsStringView());
       pStream->WriteString(L"\"");
     }
     pStream->WriteString(L" xmlns=\"");
 
     const wchar_t* pURI = XFA_GetPacketByIndex(XFA_PACKET_Form)->pURI;
-    pStream->WriteString(CFX_WideStringC(pURI, FXSYS_wcslen(pURI)));
+    pStream->WriteString(WideStringView(pURI, FXSYS_wcslen(pURI)));
 
-    CFX_WideString wsVersionNumber;
+    WideString wsVersionNumber;
     RecognizeXFAVersionNumber(
         ToNode(pNode->GetDocument()->GetXFAObject(XFA_HASHCODE_Template)),
         wsVersionNumber);
@@ -409,7 +409,7 @@ void XFA_DataExporter_RegenerateFormFile(
       wsVersionNumber = L"2.8";
 
     wsVersionNumber += L"/\"\n>";
-    pStream->WriteString(wsVersionNumber.AsStringC());
+    pStream->WriteString(wsVersionNumber.AsStringView());
 
     CXFA_Node* pChildNode = pNode->GetNodeItem(XFA_NODEITEM_FirstChild);
     while (pChildNode) {
diff --git a/xfa/fxfa/parser/cxfa_document.cpp b/xfa/fxfa/parser/cxfa_document.cpp
index 85d2758467..3a46e26cb7 100644
--- a/xfa/fxfa/parser/cxfa_document.cpp
+++ b/xfa/fxfa/parser/cxfa_document.cpp
@@ -151,11 +151,11 @@ CXFA_Object* CXFA_Document::GetXFAObject(XFA_HashCode dwNodeNameHash) {
         if (pDatasetsChild->GetNameHash() != XFA_HASHCODE_Data)
           continue;
 
-        CFX_WideString wsNamespaceURI;
+        WideString wsNamespaceURI;
         if (!pDatasetsChild->TryNamespace(wsNamespaceURI))
           continue;
 
-        CFX_WideString wsDatasetsURI;
+        WideString wsDatasetsURI;
         if (!pDatasetsNode->TryNamespace(wsDatasetsURI))
           continue;
         if (wsNamespaceURI == wsDatasetsURI)
@@ -255,7 +255,7 @@ bool CXFA_Document::IsInteractive() {
   if (!pConfig)
     return false;
 
-  CFX_WideString wsInteractive;
+  WideString wsInteractive;
   CXFA_Node* pPresent = pConfig->GetFirstChildByClass(XFA_Element::Present);
   if (!pPresent)
     return false;
@@ -297,11 +297,11 @@ CXFA_ScriptContext* CXFA_Document::GetScriptContext() {
 }
 
 XFA_VERSION CXFA_Document::RecognizeXFAVersionNumber(
-    const CFX_WideString& wsTemplateNS) {
-  CFX_WideStringC wsTemplateURIPrefix =
+    const WideString& wsTemplateNS) {
+  WideStringView wsTemplateURIPrefix =
       XFA_GetPacketByIndex(XFA_PACKET_Template)->pURI;
   FX_STRSIZE nPrefixLength = wsTemplateURIPrefix.GetLength();
-  if (CFX_WideStringC(wsTemplateNS.c_str(), wsTemplateNS.GetLength()) !=
+  if (WideStringView(wsTemplateNS.c_str(), wsTemplateNS.GetLength()) !=
       wsTemplateURIPrefix) {
     return XFA_VERSION_UNKNOWN;
   }
@@ -325,14 +325,14 @@ XFA_VERSION CXFA_Document::RecognizeXFAVersionNumber(
 }
 
 CXFA_Node* CXFA_Document::GetNodeByID(CXFA_Node* pRoot,
-                                      const CFX_WideStringC& wsID) {
+                                      const WideStringView& wsID) {
   if (!pRoot || wsID.IsEmpty())
     return nullptr;
 
   CXFA_NodeIterator sIterator(pRoot);
   for (CXFA_Node* pNode = sIterator.GetCurrent(); pNode;
        pNode = sIterator.MoveToNext()) {
-    CFX_WideStringC wsIDVal;
+    WideStringView wsIDVal;
     if (pNode->TryCData(XFA_ATTRIBUTE_Id, wsIDVal) && !wsIDVal.IsEmpty()) {
       if (wsIDVal == wsID)
         return pNode;
@@ -351,11 +351,11 @@ void CXFA_Document::DoProtoMerge() {
   CXFA_NodeIterator sIterator(pTemplateRoot);
   for (CXFA_Node* pNode = sIterator.GetCurrent(); pNode;
        pNode = sIterator.MoveToNext()) {
-    CFX_WideStringC wsIDVal;
+    WideStringView wsIDVal;
     if (pNode->TryCData(XFA_ATTRIBUTE_Id, wsIDVal) && !wsIDVal.IsEmpty()) {
       mIDMap[FX_HashCode_GetW(wsIDVal, false)] = pNode;
     }
-    CFX_WideStringC wsUseVal;
+    WideStringView wsUseVal;
     if (pNode->TryCData(XFA_ATTRIBUTE_Use, wsUseVal) && !wsUseVal.IsEmpty()) {
       sUseNodes.insert(pNode);
     } else if (pNode->TryCData(XFA_ATTRIBUTE_Usehref, wsUseVal) &&
@@ -365,33 +365,33 @@ void CXFA_Document::DoProtoMerge() {
   }
 
   for (CXFA_Node* pUseHrefNode : sUseNodes) {
-    CFX_WideString wsUseVal;
-    CFX_WideStringC wsURI, wsID, wsSOM;
+    WideString wsUseVal;
+    WideStringView wsURI, wsID, wsSOM;
     if (pUseHrefNode->TryCData(XFA_ATTRIBUTE_Usehref, wsUseVal) &&
         !wsUseVal.IsEmpty()) {
       auto uSharpPos = wsUseVal.Find('#');
       if (!uSharpPos.has_value()) {
-        wsURI = wsUseVal.AsStringC();
+        wsURI = wsUseVal.AsStringView();
       } else {
-        wsURI = CFX_WideStringC(wsUseVal.c_str(), uSharpPos.value());
+        wsURI = WideStringView(wsUseVal.c_str(), uSharpPos.value());
         FX_STRSIZE uLen = wsUseVal.GetLength();
         if (uLen >= uSharpPos.value() + 5 &&
-            CFX_WideStringC(wsUseVal.c_str() + uSharpPos.value(), 5) ==
+            WideStringView(wsUseVal.c_str() + uSharpPos.value(), 5) ==
                 L"#som(" &&
             wsUseVal[uLen - 1] == ')') {
-          wsSOM = CFX_WideStringC(wsUseVal.c_str() + uSharpPos.value() + 5,
-                                  uLen - 1 - uSharpPos.value() - 5);
+          wsSOM = WideStringView(wsUseVal.c_str() + uSharpPos.value() + 5,
+                                 uLen - 1 - uSharpPos.value() - 5);
         } else {
-          wsID = CFX_WideStringC(wsUseVal.c_str() + uSharpPos.value() + 1,
-                                 uLen - uSharpPos.value() - 1);
+          wsID = WideStringView(wsUseVal.c_str() + uSharpPos.value() + 1,
+                                uLen - uSharpPos.value() - 1);
         }
       }
     } else if (pUseHrefNode->TryCData(XFA_ATTRIBUTE_Use, wsUseVal) &&
                !wsUseVal.IsEmpty()) {
       if (wsUseVal[0] == '#')
-        wsID = CFX_WideStringC(wsUseVal.c_str() + 1, wsUseVal.GetLength() - 1);
+        wsID = WideStringView(wsUseVal.c_str() + 1, wsUseVal.GetLength() - 1);
       else
-        wsSOM = CFX_WideStringC(wsUseVal.c_str(), wsUseVal.GetLength());
+        wsSOM = WideStringView(wsUseVal.c_str(), wsUseVal.GetLength());
     }
 
     if (!wsURI.IsEmpty() && wsURI != L".")
diff --git a/xfa/fxfa/parser/cxfa_document.h b/xfa/fxfa/parser/cxfa_document.h
index 8491febdbf..69154b21e8 100644
--- a/xfa/fxfa/parser/cxfa_document.h
+++ b/xfa/fxfa/parser/cxfa_document.h
@@ -70,7 +70,7 @@ class CXFA_Document {
   CXFA_FFNotify* GetNotify() const;
   CXFA_LocaleMgr* GetLocalMgr();
   CXFA_Object* GetXFAObject(XFA_HashCode wsNodeNameHash);
-  CXFA_Node* GetNodeByID(CXFA_Node* pRoot, const CFX_WideStringC& wsID);
+  CXFA_Node* GetNodeByID(CXFA_Node* pRoot, const WideStringView& wsID);
   CXFA_Node* GetNotBindNode(const std::vector<CXFA_Object*>& arrayNodes);
   CXFA_LayoutProcessor* GetLayoutProcessor();
   CXFA_LayoutProcessor* GetDocLayout();
@@ -87,7 +87,7 @@ class CXFA_Document {
 
   bool IsInteractive();
   XFA_VERSION GetCurVersionMode() { return m_eCurVersionMode; }
-  XFA_VERSION RecognizeXFAVersionNumber(const CFX_WideString& wsTemplateNS);
+  XFA_VERSION RecognizeXFAVersionNumber(const WideString& wsTemplateNS);
 
   CXFA_Node* CreateNode(uint32_t dwPacket, XFA_Element eElement);
   CXFA_Node* CreateNode(const XFA_PACKETINFO* pPacket, XFA_Element eElement);
diff --git a/xfa/fxfa/parser/cxfa_event.cpp b/xfa/fxfa/parser/cxfa_event.cpp
index d7534289b3..d541ea0f14 100644
--- a/xfa/fxfa/parser/cxfa_event.cpp
+++ b/xfa/fxfa/parser/cxfa_event.cpp
@@ -26,7 +26,7 @@ XFA_Element CXFA_Event::GetEventType() const {
   return XFA_Element::Unknown;
 }
 
-void CXFA_Event::GetRef(CFX_WideStringC& wsRef) {
+void CXFA_Event::GetRef(WideStringView& wsRef) {
   m_pNode->TryCData(XFA_ATTRIBUTE_Ref, wsRef);
 }
 
@@ -38,12 +38,12 @@ CXFA_Submit CXFA_Event::GetSubmit() const {
   return CXFA_Submit(m_pNode->GetChild(0, XFA_Element::Submit));
 }
 
-void CXFA_Event::GetSignDataTarget(CFX_WideString& wsTarget) {
+void CXFA_Event::GetSignDataTarget(WideString& wsTarget) {
   CXFA_Node* pNode = m_pNode->GetProperty(0, XFA_Element::SignData);
   if (!pNode)
     return;
 
-  CFX_WideStringC wsCData;
+  WideStringView wsCData;
   pNode->TryCData(XFA_ATTRIBUTE_Target, wsCData);
   wsTarget = wsCData;
 }
diff --git a/xfa/fxfa/parser/cxfa_event.h b/xfa/fxfa/parser/cxfa_event.h
index fc0bcf34cc..3835454c28 100644
--- a/xfa/fxfa/parser/cxfa_event.h
+++ b/xfa/fxfa/parser/cxfa_event.h
@@ -24,8 +24,8 @@ class CXFA_Event : public CXFA_Data {
   XFA_Element GetEventType() const;
   CXFA_Script GetScript() const;
   CXFA_Submit GetSubmit() const;
-  void GetRef(CFX_WideStringC& wsRef);
-  void GetSignDataTarget(CFX_WideString& wsTarget);
+  void GetRef(WideStringView& wsRef);
+  void GetSignDataTarget(WideString& wsTarget);
 };
 
 #endif  // XFA_FXFA_PARSER_CXFA_EVENT_H_
diff --git a/xfa/fxfa/parser/cxfa_exdata.cpp b/xfa/fxfa/parser/cxfa_exdata.cpp
index ac82b3043c..8ba9d0218b 100644
--- a/xfa/fxfa/parser/cxfa_exdata.cpp
+++ b/xfa/fxfa/parser/cxfa_exdata.cpp
@@ -10,6 +10,6 @@
 
 CXFA_ExData::CXFA_ExData(CXFA_Node* pNode) : CXFA_Data(pNode) {}
 
-bool CXFA_ExData::SetContentType(const CFX_WideString& wsContentType) {
+bool CXFA_ExData::SetContentType(const WideString& wsContentType) {
   return m_pNode->SetCData(XFA_ATTRIBUTE_ContentType, wsContentType);
 }
diff --git a/xfa/fxfa/parser/cxfa_exdata.h b/xfa/fxfa/parser/cxfa_exdata.h
index c92bacd3f2..03913a2165 100644
--- a/xfa/fxfa/parser/cxfa_exdata.h
+++ b/xfa/fxfa/parser/cxfa_exdata.h
@@ -16,7 +16,7 @@ class CXFA_ExData : public CXFA_Data {
  public:
   explicit CXFA_ExData(CXFA_Node* pNode);
 
-  bool SetContentType(const CFX_WideString& wsContentType);
+  bool SetContentType(const WideString& wsContentType);
 };
 
 #endif  // XFA_FXFA_PARSER_CXFA_EXDATA_H_
diff --git a/xfa/fxfa/parser/cxfa_fill.cpp b/xfa/fxfa/parser/cxfa_fill.cpp
index 8a7969d5e4..6b39134126 100644
--- a/xfa/fxfa/parser/cxfa_fill.cpp
+++ b/xfa/fxfa/parser/cxfa_fill.cpp
@@ -18,7 +18,7 @@ int32_t CXFA_Fill::GetPresence() {
 
 void CXFA_Fill::SetColor(FX_ARGB color) {
   CXFA_Node* pNode = m_pNode->GetProperty(0, XFA_Element::Color);
-  CFX_WideString wsColor;
+  WideString wsColor;
   int a;
   int r;
   int g;
@@ -30,7 +30,7 @@ void CXFA_Fill::SetColor(FX_ARGB color) {
 
 FX_ARGB CXFA_Fill::GetColor(bool bText) {
   if (CXFA_Node* pNode = m_pNode->GetChild(0, XFA_Element::Color)) {
-    CFX_WideStringC wsColor;
+    WideStringView wsColor;
     if (pNode->TryCData(XFA_ATTRIBUTE_Value, wsColor, false))
       return CXFA_Data::ToColor(wsColor);
   }
@@ -54,7 +54,7 @@ XFA_Element CXFA_Fill::GetFillType() {
 int32_t CXFA_Fill::GetPattern(FX_ARGB& foreColor) {
   CXFA_Node* pNode = m_pNode->GetProperty(0, XFA_Element::Pattern);
   if (CXFA_Node* pColor = pNode->GetChild(0, XFA_Element::Color)) {
-    CFX_WideStringC wsColor;
+    WideStringView wsColor;
     pColor->TryCData(XFA_ATTRIBUTE_Value, wsColor, false);
     foreColor = CXFA_Data::ToColor(wsColor);
   } else {
@@ -68,7 +68,7 @@ int32_t CXFA_Fill::GetStipple(FX_ARGB& stippleColor) {
   int32_t eAttr = 50;
   pNode->TryInteger(XFA_ATTRIBUTE_Rate, eAttr);
   if (CXFA_Node* pColor = pNode->GetChild(0, XFA_Element::Color)) {
-    CFX_WideStringC wsColor;
+    WideStringView wsColor;
     pColor->TryCData(XFA_ATTRIBUTE_Value, wsColor, false);
     stippleColor = CXFA_Data::ToColor(wsColor);
   } else {
@@ -82,7 +82,7 @@ int32_t CXFA_Fill::GetLinear(FX_ARGB& endColor) {
   XFA_ATTRIBUTEENUM eAttr = XFA_ATTRIBUTEENUM_ToRight;
   pNode->TryEnum(XFA_ATTRIBUTE_Type, eAttr);
   if (CXFA_Node* pColor = pNode->GetChild(0, XFA_Element::Color)) {
-    CFX_WideStringC wsColor;
+    WideStringView wsColor;
     pColor->TryCData(XFA_ATTRIBUTE_Value, wsColor, false);
     endColor = CXFA_Data::ToColor(wsColor);
   } else {
@@ -96,7 +96,7 @@ int32_t CXFA_Fill::GetRadial(FX_ARGB& endColor) {
   XFA_ATTRIBUTEENUM eAttr = XFA_ATTRIBUTEENUM_ToEdge;
   pNode->TryEnum(XFA_ATTRIBUTE_Type, eAttr);
   if (CXFA_Node* pColor = pNode->GetChild(0, XFA_Element::Color)) {
-    CFX_WideStringC wsColor;
+    WideStringView wsColor;
     pColor->TryCData(XFA_ATTRIBUTE_Value, wsColor, false);
     endColor = CXFA_Data::ToColor(wsColor);
   } else {
diff --git a/xfa/fxfa/parser/cxfa_font.cpp b/xfa/fxfa/parser/cxfa_font.cpp
index 56e04b75f7..71aa61700f 100644
--- a/xfa/fxfa/parser/cxfa_font.cpp
+++ b/xfa/fxfa/parser/cxfa_font.cpp
@@ -18,21 +18,21 @@ float CXFA_Font::GetBaselineShift() {
 }
 
 float CXFA_Font::GetHorizontalScale() {
-  CFX_WideString wsValue;
+  WideString wsValue;
   m_pNode->TryCData(XFA_ATTRIBUTE_FontHorizontalScale, wsValue);
   int32_t iScale = FXSYS_wtoi(wsValue.c_str());
   return iScale > 0 ? (float)iScale : 100.0f;
 }
 
 float CXFA_Font::GetVerticalScale() {
-  CFX_WideString wsValue;
+  WideString wsValue;
   m_pNode->TryCData(XFA_ATTRIBUTE_FontVerticalScale, wsValue);
   int32_t iScale = FXSYS_wtoi(wsValue.c_str());
   return iScale > 0 ? (float)iScale : 100.0f;
 }
 
 float CXFA_Font::GetLetterSpacing() {
-  CFX_WideStringC wsValue;
+  WideStringView wsValue;
   if (!m_pNode->TryCData(XFA_ATTRIBUTE_LetterSpacing, wsValue))
     return 0;
 
@@ -66,7 +66,7 @@ float CXFA_Font::GetFontSize() {
   return ms.ToUnit(XFA_UNIT_Pt);
 }
 
-void CXFA_Font::GetTypeface(CFX_WideStringC& wsTypeFace) {
+void CXFA_Font::GetTypeface(WideStringView& wsTypeFace) {
   m_pNode->TryCData(XFA_ATTRIBUTE_Typeface, wsTypeFace);
 }
 
diff --git a/xfa/fxfa/parser/cxfa_font.h b/xfa/fxfa/parser/cxfa_font.h
index 2a5fef1122..af0c348aa7 100644
--- a/xfa/fxfa/parser/cxfa_font.h
+++ b/xfa/fxfa/parser/cxfa_font.h
@@ -24,7 +24,7 @@ class CXFA_Font : public CXFA_Data {
   int32_t GetUnderline();
   int32_t GetUnderlinePeriod();
   float GetFontSize();
-  void GetTypeface(CFX_WideStringC& wsTypeFace);
+  void GetTypeface(WideStringView& wsTypeFace);
 
   bool IsBold();
   bool IsItalic();
diff --git a/xfa/fxfa/parser/cxfa_image.cpp b/xfa/fxfa/parser/cxfa_image.cpp
index 8d14d62960..b6d78d9eda 100644
--- a/xfa/fxfa/parser/cxfa_image.cpp
+++ b/xfa/fxfa/parser/cxfa_image.cpp
@@ -15,11 +15,11 @@ int32_t CXFA_Image::GetAspect() {
   return m_pNode->GetEnum(XFA_ATTRIBUTE_Aspect);
 }
 
-bool CXFA_Image::GetContentType(CFX_WideString& wsContentType) {
+bool CXFA_Image::GetContentType(WideString& wsContentType) {
   return m_pNode->TryCData(XFA_ATTRIBUTE_ContentType, wsContentType);
 }
 
-bool CXFA_Image::GetHref(CFX_WideString& wsHref) {
+bool CXFA_Image::GetHref(WideString& wsHref) {
   if (m_bDefValue)
     return m_pNode->TryCData(XFA_ATTRIBUTE_Href, wsHref);
   return m_pNode->GetAttribute(L"href", wsHref);
@@ -31,18 +31,18 @@ int32_t CXFA_Image::GetTransferEncoding() {
   return XFA_ATTRIBUTEENUM_Base64;
 }
 
-bool CXFA_Image::GetContent(CFX_WideString& wsText) {
+bool CXFA_Image::GetContent(WideString& wsText) {
   return m_pNode->TryContent(wsText);
 }
 
-bool CXFA_Image::SetContentType(const CFX_WideString& wsContentType) {
+bool CXFA_Image::SetContentType(const WideString& wsContentType) {
   return m_pNode->SetCData(XFA_ATTRIBUTE_ContentType, wsContentType);
 }
 
-bool CXFA_Image::SetHref(const CFX_WideString& wsHref) {
+bool CXFA_Image::SetHref(const WideString& wsHref) {
   if (m_bDefValue)
     return m_pNode->SetCData(XFA_ATTRIBUTE_Href, wsHref);
-  return m_pNode->SetAttribute(XFA_ATTRIBUTE_Href, wsHref.AsStringC());
+  return m_pNode->SetAttribute(XFA_ATTRIBUTE_Href, wsHref.AsStringView());
 }
 
 bool CXFA_Image::SetTransferEncoding(int32_t iTransferEncoding) {
diff --git a/xfa/fxfa/parser/cxfa_image.h b/xfa/fxfa/parser/cxfa_image.h
index 204441ab6b..cc08bc3380 100644
--- a/xfa/fxfa/parser/cxfa_image.h
+++ b/xfa/fxfa/parser/cxfa_image.h
@@ -18,12 +18,12 @@ class CXFA_Image : public CXFA_Data {
   CXFA_Image(CXFA_Node* pNode, bool bDefValue);
 
   int32_t GetAspect();
-  bool GetContentType(CFX_WideString& wsContentType);
-  bool GetHref(CFX_WideString& wsHref);
+  bool GetContentType(WideString& wsContentType);
+  bool GetHref(WideString& wsHref);
   int32_t GetTransferEncoding();
-  bool GetContent(CFX_WideString& wsText);
-  bool SetContentType(const CFX_WideString& wsContentType);
-  bool SetHref(const CFX_WideString& wsHref);
+  bool GetContent(WideString& wsText);
+  bool SetContentType(const WideString& wsContentType);
+  bool SetHref(const WideString& wsHref);
   bool SetTransferEncoding(int32_t iTransferEncoding);
 
  private:
diff --git a/xfa/fxfa/parser/cxfa_itemlayoutprocessor.cpp b/xfa/fxfa/parser/cxfa_itemlayoutprocessor.cpp
index f7a019d2d8..7d9a2188c8 100644
--- a/xfa/fxfa/parser/cxfa_itemlayoutprocessor.cpp
+++ b/xfa/fxfa/parser/cxfa_itemlayoutprocessor.cpp
@@ -29,10 +29,10 @@
 
 namespace {
 
-std::vector<CFX_WideString> SeparateStringW(const wchar_t* pStr,
-                                            int32_t iStrLen,
-                                            wchar_t delimiter) {
-  std::vector<CFX_WideString> ret;
+std::vector<WideString> SeparateStringW(const wchar_t* pStr,
+                                        int32_t iStrLen,
+                                        wchar_t delimiter) {
+  std::vector<WideString> ret;
   if (!pStr)
     return ret;
   if (iStrLen < 0)
@@ -42,7 +42,7 @@ std::vector<CFX_WideString> SeparateStringW(const wchar_t* pStr,
   const wchar_t* pEnd = pStr + iStrLen;
   while (true) {
     if (pStr >= pEnd || delimiter == *pStr) {
-      ret.push_back(CFX_WideString(pToken, pStr - pToken));
+      ret.push_back(WideString(pToken, pStr - pToken));
       pToken = pStr + 1;
       if (pStr >= pEnd)
         break;
@@ -1746,7 +1746,7 @@ void CXFA_ItemLayoutProcessor::DoLayoutTableContainer(CXFA_Node* pLayoutNode) {
   float fContentWidthLimit =
       bContainerWidthAutoSize ? FLT_MAX
                               : containerSize.width - fLeftInset - fRightInset;
-  CFX_WideStringC wsColumnWidths;
+  WideStringView wsColumnWidths;
   if (pLayoutNode->TryCData(XFA_ATTRIBUTE_ColumnWidths, wsColumnWidths)) {
     auto widths = SeparateStringW(wsColumnWidths.unterminated_c_str(),
                                   wsColumnWidths.GetLength(), L' ');
@@ -1756,7 +1756,7 @@ void CXFA_ItemLayoutProcessor::DoLayoutTableContainer(CXFA_Node* pLayoutNode) {
         continue;
 
       m_rgSpecifiedColumnWidths.push_back(
-          CXFA_Measurement(width.AsStringC()).ToUnit(XFA_UNIT_Pt));
+          CXFA_Measurement(width.AsStringView()).ToUnit(XFA_UNIT_Pt));
     }
   }
 
diff --git a/xfa/fxfa/parser/cxfa_layoutpagemgr.cpp b/xfa/fxfa/parser/cxfa_layoutpagemgr.cpp
index b80100a5f0..d8fdbb4ba1 100644
--- a/xfa/fxfa/parser/cxfa_layoutpagemgr.cpp
+++ b/xfa/fxfa/parser/cxfa_layoutpagemgr.cpp
@@ -65,7 +65,7 @@ class PageSetContainerLayoutItem {
 
 uint32_t GetRelevant(CXFA_Node* pFormItem, uint32_t dwParentRelvant) {
   uint32_t dwRelevant = XFA_WidgetStatus_Viewable | XFA_WidgetStatus_Printable;
-  CFX_WideStringC wsRelevant;
+  WideStringView wsRelevant;
   if (pFormItem->TryCData(XFA_ATTRIBUTE_Relevant, wsRelevant)) {
     if (wsRelevant == L"+print" || wsRelevant == L"print")
       dwRelevant &= ~XFA_WidgetStatus_Viewable;
@@ -136,18 +136,18 @@ void RemoveLayoutItem(CXFA_ContainerLayoutItem* pLayoutItem) {
 
 CXFA_Node* ResolveBreakTarget(CXFA_Node* pPageSetRoot,
                               bool bNewExprStyle,
-                              CFX_WideStringC& wsTargetExpr) {
+                              WideStringView& wsTargetExpr) {
   CXFA_Document* pDocument = pPageSetRoot->GetDocument();
   if (wsTargetExpr.IsEmpty())
     return nullptr;
 
-  CFX_WideString wsTargetAll(wsTargetExpr);
+  WideString wsTargetAll(wsTargetExpr);
   wsTargetAll.TrimLeft();
   wsTargetAll.TrimRight();
   int32_t iSplitIndex = 0;
   bool bTargetAllFind = true;
   while (iSplitIndex != -1) {
-    CFX_WideString wsExpr;
+    WideString wsExpr;
     pdfium::Optional<FX_STRSIZE> iSplitNextIndex = 0;
     if (!bTargetAllFind) {
       iSplitNextIndex = wsTargetAll.Find(' ', iSplitIndex);
@@ -165,17 +165,17 @@ CXFA_Node* ResolveBreakTarget(CXFA_Node* pPageSetRoot,
     if (wsExpr[0] == '#') {
       CXFA_Node* pNode = pDocument->GetNodeByID(
           ToNode(pDocument->GetXFAObject(XFA_HASHCODE_Template)),
-          wsExpr.Right(wsExpr.GetLength() - 1).AsStringC());
+          wsExpr.Right(wsExpr.GetLength() - 1).AsStringView());
       if (pNode)
         return pNode;
     } else if (bNewExprStyle) {
-      CFX_WideString wsProcessedTarget = wsExpr;
+      WideString wsProcessedTarget = wsExpr;
       if (wsExpr.Left(4) == L"som(" && wsExpr.Last() == L')') {
         wsProcessedTarget = wsExpr.Mid(4, wsExpr.GetLength() - 5);
       }
       XFA_RESOLVENODE_RS rs;
       int32_t iCount = pDocument->GetScriptContext()->ResolveObjects(
-          pPageSetRoot, wsProcessedTarget.AsStringC(), rs,
+          pPageSetRoot, wsProcessedTarget.AsStringView(), rs,
           XFA_RESOLVENODE_Children | XFA_RESOLVENODE_Properties |
               XFA_RESOLVENODE_Attributes | XFA_RESOLVENODE_Siblings |
               XFA_RESOLVENODE_Parent);
@@ -477,7 +477,7 @@ float CXFA_LayoutPageMgr::GetAvailHeight() {
 }
 
 bool XFA_LayoutPageMgr_RunBreakTestScript(CXFA_Node* pTestScript) {
-  CFX_WideString wsExpression;
+  WideString wsExpression;
   pTestScript->TryContent(wsExpression);
   if (wsExpression.IsEmpty())
     return true;
@@ -801,7 +801,7 @@ bool CXFA_LayoutPageMgr::ExecuteBreakBeforeOrAfter(
   switch (eType) {
     case XFA_Element::BreakBefore:
     case XFA_Element::BreakAfter: {
-      CFX_WideStringC wsBreakLeader, wsBreakTrailer;
+      WideStringView wsBreakLeader, wsBreakTrailer;
       CXFA_Node* pFormNode = pCurNode->GetNodeItem(
           XFA_NODEITEM_Parent, XFA_ObjectType::ContainerNode);
       CXFA_Node* pContainer = pFormNode->GetTemplateNode();
@@ -810,7 +810,7 @@ bool CXFA_LayoutPageMgr::ExecuteBreakBeforeOrAfter(
       if (pScript && !XFA_LayoutPageMgr_RunBreakTestScript(pScript))
         return false;
 
-      CFX_WideStringC wsTarget = pCurNode->GetCData(XFA_ATTRIBUTE_Target);
+      WideStringView wsTarget = pCurNode->GetCData(XFA_ATTRIBUTE_Target);
       CXFA_Node* pTarget =
           ResolveBreakTarget(m_pTemplatePageSetRoot, true, wsTarget);
       wsBreakTrailer = pCurNode->GetCData(XFA_ATTRIBUTE_Trailer);
@@ -845,7 +845,7 @@ bool CXFA_LayoutPageMgr::ExecuteBreakBeforeOrAfter(
     }
     case XFA_Element::Break: {
       bool bStartNew = pCurNode->GetInteger(XFA_ATTRIBUTE_StartNew) != 0;
-      CFX_WideStringC wsTarget = pCurNode->GetCData(
+      WideStringView wsTarget = pCurNode->GetCData(
           bBefore ? XFA_ATTRIBUTE_BeforeTarget : XFA_ATTRIBUTE_AfterTarget);
       CXFA_Node* pTarget =
           ResolveBreakTarget(m_pTemplatePageSetRoot, true, wsTarget);
@@ -936,9 +936,9 @@ CXFA_Node* CXFA_LayoutPageMgr::BreakOverflow(CXFA_Node* pOverflowNode,
           ->GetNodeItem(XFA_NODEITEM_Parent, XFA_ObjectType::ContainerNode)
           ->GetTemplateNode();
   if (pOverflowNode->GetElementType() == XFA_Element::Break) {
-    CFX_WideStringC wsOverflowLeader;
-    CFX_WideStringC wsOverflowTarget;
-    CFX_WideStringC wsOverflowTrailer;
+    WideStringView wsOverflowLeader;
+    WideStringView wsOverflowTarget;
+    WideStringView wsOverflowTrailer;
     pOverflowNode->TryCData(XFA_ATTRIBUTE_OverflowLeader, wsOverflowLeader);
     pOverflowNode->TryCData(XFA_ATTRIBUTE_OverflowTrailer, wsOverflowTrailer);
     pOverflowNode->TryCData(XFA_ATTRIBUTE_OverflowTarget, wsOverflowTarget);
@@ -978,9 +978,9 @@ CXFA_Node* CXFA_LayoutPageMgr::BreakOverflow(CXFA_Node* pOverflowNode,
   if (pOverflowNode->GetElementType() != XFA_Element::Overflow)
     return nullptr;
 
-  CFX_WideStringC wsOverflowLeader;
-  CFX_WideStringC wsOverflowTrailer;
-  CFX_WideStringC wsOverflowTarget;
+  WideStringView wsOverflowLeader;
+  WideStringView wsOverflowTrailer;
+  WideStringView wsOverflowTarget;
   pOverflowNode->TryCData(XFA_ATTRIBUTE_Leader, wsOverflowLeader);
   pOverflowNode->TryCData(XFA_ATTRIBUTE_Trailer, wsOverflowTrailer);
   pOverflowNode->TryCData(XFA_ATTRIBUTE_Target, wsOverflowTarget);
@@ -1067,7 +1067,7 @@ bool CXFA_LayoutPageMgr::ResolveBookendLeaderOrTrailer(
     CXFA_Node* pBookendNode,
     bool bLeader,
     CXFA_Node*& pBookendAppendTemplate) {
-  CFX_WideStringC wsBookendLeader;
+  WideStringView wsBookendLeader;
   CXFA_Node* pContainer =
       pBookendNode
           ->GetNodeItem(XFA_NODEITEM_Parent, XFA_ObjectType::ContainerNode)
@@ -1642,9 +1642,9 @@ CXFA_Node* CXFA_LayoutPageMgr::QueryOverflow(CXFA_Node* pFormNode) {
   for (CXFA_Node* pCurNode = pFormNode->GetNodeItem(XFA_NODEITEM_FirstChild);
        pCurNode; pCurNode = pCurNode->GetNodeItem((XFA_NODEITEM_NextSibling))) {
     if (pCurNode->GetElementType() == XFA_Element::Break) {
-      CFX_WideStringC wsOverflowLeader;
-      CFX_WideStringC wsOverflowTarget;
-      CFX_WideStringC wsOverflowTrailer;
+      WideStringView wsOverflowLeader;
+      WideStringView wsOverflowTarget;
+      WideStringView wsOverflowTrailer;
       pCurNode->TryCData(XFA_ATTRIBUTE_OverflowLeader, wsOverflowLeader);
       pCurNode->TryCData(XFA_ATTRIBUTE_OverflowTrailer, wsOverflowTrailer);
       pCurNode->TryCData(XFA_ATTRIBUTE_OverflowTarget, wsOverflowTarget);
diff --git a/xfa/fxfa/parser/cxfa_localemgr.cpp b/xfa/fxfa/parser/cxfa_localemgr.cpp
index 833f72c33f..5d74c9bf47 100644
--- a/xfa/fxfa/parser/cxfa_localemgr.cpp
+++ b/xfa/fxfa/parser/cxfa_localemgr.cpp
@@ -1078,7 +1078,7 @@ static std::unique_ptr<IFX_Locale> XFA_GetLocaleFromBuffer(const uint8_t* pBuf,
                  : nullptr;
 }
 
-static uint16_t XFA_GetLanguage(CFX_WideString wsLanguage) {
+static uint16_t XFA_GetLanguage(WideString wsLanguage) {
   if (wsLanguage.GetLength() < 2)
     return FX_LANG_en_US;
 
@@ -1121,7 +1121,7 @@ static uint16_t XFA_GetLanguage(CFX_WideString wsLanguage) {
   return FX_LANG_en_US;
 }
 
-CXFA_LocaleMgr::CXFA_LocaleMgr(CXFA_Node* pLocaleSet, CFX_WideString wsDeflcid)
+CXFA_LocaleMgr::CXFA_LocaleMgr(CXFA_Node* pLocaleSet, WideString wsDeflcid)
     : m_dwLocaleFlags(0x00) {
   m_dwDeflcid = XFA_GetLanguage(wsDeflcid);
   if (pLocaleSet) {
@@ -1194,8 +1194,7 @@ std::unique_ptr<IFX_Locale> CXFA_LocaleMgr::GetLocale(uint16_t lcid) {
   }
 }
 
-IFX_Locale* CXFA_LocaleMgr::GetLocaleByName(
-    const CFX_WideString& wsLocaleName) {
+IFX_Locale* CXFA_LocaleMgr::GetLocaleByName(const WideString& wsLocaleName) {
   for (size_t i = 0; i < m_LocaleArray.size(); i++) {
     IFX_Locale* pLocale = m_LocaleArray[i].get();
     if (pLocale->GetName() == wsLocaleName)
@@ -1220,7 +1219,7 @@ void CXFA_LocaleMgr::SetDefLocale(IFX_Locale* pLocale) {
   m_pDefLocale = pLocale;
 }
 
-CFX_WideStringC CXFA_LocaleMgr::GetConfigLocaleName(CXFA_Node* pConfig) {
+WideStringView CXFA_LocaleMgr::GetConfigLocaleName(CXFA_Node* pConfig) {
   if (!(m_dwLocaleFlags & 0x01)) {
     m_wsConfigLocale.clear();
     if (pConfig) {
@@ -1242,5 +1241,5 @@ CFX_WideStringC CXFA_LocaleMgr::GetConfigLocaleName(CXFA_Node* pConfig) {
     }
     m_dwLocaleFlags |= 0x01;
   }
-  return m_wsConfigLocale.AsStringC();
+  return m_wsConfigLocale.AsStringView();
 }
diff --git a/xfa/fxfa/parser/cxfa_localemgr.h b/xfa/fxfa/parser/cxfa_localemgr.h
index f730304c10..d77a94a519 100644
--- a/xfa/fxfa/parser/cxfa_localemgr.h
+++ b/xfa/fxfa/parser/cxfa_localemgr.h
@@ -19,15 +19,15 @@ class IFX_Locale;
 
 class CXFA_LocaleMgr {
  public:
-  CXFA_LocaleMgr(CXFA_Node* pLocaleSet, CFX_WideString wsDeflcid);
+  CXFA_LocaleMgr(CXFA_Node* pLocaleSet, WideString wsDeflcid);
   ~CXFA_LocaleMgr();
 
   uint16_t GetDefLocaleID() const;
   IFX_Locale* GetDefLocale();
-  IFX_Locale* GetLocaleByName(const CFX_WideString& wsLocaleName);
+  IFX_Locale* GetLocaleByName(const WideString& wsLocaleName);
 
   void SetDefLocale(IFX_Locale* pLocale);
-  CFX_WideStringC GetConfigLocaleName(CXFA_Node* pConfig);
+  WideStringView GetConfigLocaleName(CXFA_Node* pConfig);
 
  private:
   std::unique_ptr<IFX_Locale> GetLocale(uint16_t lcid);
@@ -35,7 +35,7 @@ class CXFA_LocaleMgr {
   std::vector<std::unique_ptr<IFX_Locale>> m_LocaleArray;
   std::vector<std::unique_ptr<IFX_Locale>> m_XMLLocaleArray;
   IFX_Locale* m_pDefLocale;  // owned by m_LocaleArray or m_XMLLocaleArray.
-  CFX_WideString m_wsConfigLocale;
+  WideString m_wsConfigLocale;
   uint16_t m_dwDeflcid;
   uint16_t m_dwLocaleFlags;
 };
diff --git a/xfa/fxfa/parser/cxfa_localevalue.cpp b/xfa/fxfa/parser/cxfa_localevalue.cpp
index dd56e6d7a1..109254fe2c 100644
--- a/xfa/fxfa/parser/cxfa_localevalue.cpp
+++ b/xfa/fxfa/parser/cxfa_localevalue.cpp
@@ -41,9 +41,9 @@ FX_LOCALECATEGORY ValueCategory(FX_LOCALECATEGORY eCategory,
   return FX_LOCALECATEGORY_Unknown;
 }
 
-bool ValueSplitDateTime(const CFX_WideString& wsDateTime,
-                        CFX_WideString& wsDate,
-                        CFX_WideString& wsTime) {
+bool ValueSplitDateTime(const WideString& wsDateTime,
+                        WideString& wsDate,
+                        WideString& wsTime) {
   wsDate = L"";
   wsTime = L"";
   if (wsDateTime.IsEmpty())
@@ -77,7 +77,7 @@ CXFA_LocaleValue::CXFA_LocaleValue(uint32_t dwType, CXFA_LocaleMgr* pLocaleMgr)
       m_bValid(m_dwType != XFA_VT_NULL) {}
 
 CXFA_LocaleValue::CXFA_LocaleValue(uint32_t dwType,
-                                   const CFX_WideString& wsValue,
+                                   const WideString& wsValue,
                                    CXFA_LocaleMgr* pLocaleMgr)
     : m_pLocaleMgr(pLocaleMgr),
       m_wsValue(wsValue),
@@ -85,8 +85,8 @@ CXFA_LocaleValue::CXFA_LocaleValue(uint32_t dwType,
       m_bValid(ValidateCanonicalValue(wsValue, dwType)) {}
 
 CXFA_LocaleValue::CXFA_LocaleValue(uint32_t dwType,
-                                   const CFX_WideString& wsValue,
-                                   const CFX_WideString& wsFormat,
+                                   const WideString& wsValue,
+                                   const WideString& wsFormat,
                                    IFX_Locale* pLocale,
                                    CXFA_LocaleMgr* pLocaleMgr)
     : m_pLocaleMgr(pLocaleMgr),
@@ -103,24 +103,24 @@ CXFA_LocaleValue& CXFA_LocaleValue::operator=(const CXFA_LocaleValue& value) {
 
 CXFA_LocaleValue::~CXFA_LocaleValue() {}
 
-bool CXFA_LocaleValue::ValidateValue(const CFX_WideString& wsValue,
-                                     const CFX_WideString& wsPattern,
+bool CXFA_LocaleValue::ValidateValue(const WideString& wsValue,
+                                     const WideString& wsPattern,
                                      IFX_Locale* pLocale,
-                                     CFX_WideString* pMatchFormat) {
-  CFX_WideString wsOutput;
+                                     WideString* pMatchFormat) {
+  WideString wsOutput;
   IFX_Locale* locale = m_pLocaleMgr->GetDefLocale();
   if (pLocale)
     m_pLocaleMgr->SetDefLocale(pLocale);
 
   auto pFormat = pdfium::MakeUnique<CFGAS_FormatString>(m_pLocaleMgr);
-  std::vector<CFX_WideString> wsPatterns;
+  std::vector<WideString> wsPatterns;
   pFormat->SplitFormatString(wsPattern, &wsPatterns);
 
   bool bRet = false;
   int32_t iCount = pdfium::CollectionSize<int32_t>(wsPatterns);
   int32_t i = 0;
   for (; i < iCount && !bRet; i++) {
-    CFX_WideString wsFormat = wsPatterns[i];
+    WideString wsFormat = wsPatterns[i];
     switch (ValueCategory(pFormat->GetCategory(wsFormat), m_dwType)) {
       case FX_LOCALECATEGORY_Null:
         bRet = pFormat->ParseNull(wsValue, wsFormat);
@@ -133,7 +133,7 @@ bool CXFA_LocaleValue::ValidateValue(const CFX_WideString& wsValue,
           bRet = wsValue == L"0";
         break;
       case FX_LOCALECATEGORY_Num: {
-        CFX_WideString fNum;
+        WideString fNum;
         bRet = pFormat->ParseNum(wsValue, wsFormat, &fNum);
         if (!bRet)
           bRet = pFormat->FormatNum(wsValue, wsFormat, &wsOutput);
@@ -285,7 +285,7 @@ CFX_DateTime CXFA_LocaleValue::GetTime() const {
     return CFX_DateTime();
 
   CFX_DateTime dt;
-  FX_TimeFromCanonical(m_wsValue.AsStringC(), &dt,
+  FX_TimeFromCanonical(m_wsValue.AsStringView(), &dt,
                        m_pLocaleMgr->GetDefLocale());
   return dt;
 }
@@ -301,7 +301,7 @@ bool CXFA_LocaleValue::SetTime(const CFX_DateTime& t) {
   m_wsValue.Format(L"%02d:%02d:%02d", t.GetHour(), t.GetMinute(),
                    t.GetSecond());
   if (t.GetMillisecond() > 0) {
-    CFX_WideString wsTemp;
+    WideString wsTemp;
     wsTemp.Format(L"%:03d", t.GetMillisecond());
     m_wsValue += wsTemp;
   }
@@ -314,19 +314,19 @@ bool CXFA_LocaleValue::SetDateTime(const CFX_DateTime& dt) {
                    dt.GetMonth(), dt.GetDay(), dt.GetHour(), dt.GetMinute(),
                    dt.GetSecond());
   if (dt.GetMillisecond() > 0) {
-    CFX_WideString wsTemp;
+    WideString wsTemp;
     wsTemp.Format(L"%:03d", dt.GetMillisecond());
     m_wsValue += wsTemp;
   }
   return true;
 }
 
-bool CXFA_LocaleValue::FormatPatterns(CFX_WideString& wsResult,
-                                      const CFX_WideString& wsFormat,
+bool CXFA_LocaleValue::FormatPatterns(WideString& wsResult,
+                                      const WideString& wsFormat,
                                       IFX_Locale* pLocale,
                                       XFA_VALUEPICTURE eValueType) const {
   auto pFormat = pdfium::MakeUnique<CFGAS_FormatString>(m_pLocaleMgr);
-  std::vector<CFX_WideString> wsPatterns;
+  std::vector<WideString> wsPatterns;
   pFormat->SplitFormatString(wsFormat, &wsPatterns);
   wsResult.clear();
   int32_t iCount = pdfium::CollectionSize<int32_t>(wsPatterns);
@@ -337,8 +337,8 @@ bool CXFA_LocaleValue::FormatPatterns(CFX_WideString& wsResult,
   return false;
 }
 
-bool CXFA_LocaleValue::FormatSinglePattern(CFX_WideString& wsResult,
-                                           const CFX_WideString& wsFormat,
+bool CXFA_LocaleValue::FormatSinglePattern(WideString& wsResult,
+                                           const WideString& wsFormat,
                                            IFX_Locale* pLocale,
                                            XFA_VALUEPICTURE eValueType) const {
   IFX_Locale* locale = m_pLocaleMgr->GetDefLocale();
@@ -391,7 +391,7 @@ bool CXFA_LocaleValue::FormatSinglePattern(CFX_WideString& wsResult,
   return bRet;
 }
 
-bool CXFA_LocaleValue::ValidateCanonicalValue(const CFX_WideString& wsValue,
+bool CXFA_LocaleValue::ValidateCanonicalValue(const WideString& wsValue,
                                               uint32_t dwVType) {
   if (wsValue.IsEmpty())
     return true;
@@ -402,8 +402,8 @@ bool CXFA_LocaleValue::ValidateCanonicalValue(const CFX_WideString& wsValue,
       if (ValidateCanonicalDate(wsValue, &dt))
         return true;
 
-      CFX_WideString wsDate;
-      CFX_WideString wsTime;
+      WideString wsDate;
+      WideString wsTime;
       if (ValueSplitDateTime(wsValue, wsDate, wsTime) &&
           ValidateCanonicalDate(wsDate, &dt)) {
         return true;
@@ -414,8 +414,8 @@ bool CXFA_LocaleValue::ValidateCanonicalValue(const CFX_WideString& wsValue,
       if (ValidateCanonicalTime(wsValue))
         return true;
 
-      CFX_WideString wsDate;
-      CFX_WideString wsTime;
+      WideString wsDate;
+      WideString wsTime;
       if (ValueSplitDateTime(wsValue, wsDate, wsTime) &&
           ValidateCanonicalTime(wsTime)) {
         return true;
@@ -423,7 +423,7 @@ bool CXFA_LocaleValue::ValidateCanonicalValue(const CFX_WideString& wsValue,
       return false;
     }
     case XFA_VT_DATETIME: {
-      CFX_WideString wsDate, wsTime;
+      WideString wsDate, wsTime;
       if (ValueSplitDateTime(wsValue, wsDate, wsTime) &&
           ValidateCanonicalDate(wsDate, &dt) && ValidateCanonicalTime(wsTime)) {
         return true;
@@ -433,7 +433,7 @@ bool CXFA_LocaleValue::ValidateCanonicalValue(const CFX_WideString& wsValue,
   return true;
 }
 
-bool CXFA_LocaleValue::ValidateCanonicalDate(const CFX_WideString& wsDate,
+bool CXFA_LocaleValue::ValidateCanonicalDate(const WideString& wsDate,
                                              CFX_DateTime* unDate) {
   static const uint16_t LastDay[12] = {31, 28, 31, 30, 31, 30,
                                        31, 31, 30, 31, 30, 31};
@@ -510,7 +510,7 @@ bool CXFA_LocaleValue::ValidateCanonicalDate(const CFX_WideString& wsDate,
   return true;
 }
 
-bool CXFA_LocaleValue::ValidateCanonicalTime(const CFX_WideString& wsTime) {
+bool CXFA_LocaleValue::ValidateCanonicalTime(const WideString& wsTime) {
   int nLen = wsTime.GetLength();
   if (nLen < 2)
     return false;
@@ -605,20 +605,20 @@ bool CXFA_LocaleValue::ValidateCanonicalTime(const CFX_WideString& wsTime) {
          wFraction <= 999;
 }
 
-bool CXFA_LocaleValue::ParsePatternValue(const CFX_WideString& wsValue,
-                                         const CFX_WideString& wsPattern,
+bool CXFA_LocaleValue::ParsePatternValue(const WideString& wsValue,
+                                         const WideString& wsPattern,
                                          IFX_Locale* pLocale) {
   IFX_Locale* locale = m_pLocaleMgr->GetDefLocale();
   if (pLocale)
     m_pLocaleMgr->SetDefLocale(pLocale);
 
   auto pFormat = pdfium::MakeUnique<CFGAS_FormatString>(m_pLocaleMgr);
-  std::vector<CFX_WideString> wsPatterns;
+  std::vector<WideString> wsPatterns;
   pFormat->SplitFormatString(wsPattern, &wsPatterns);
   bool bRet = false;
   int32_t iCount = pdfium::CollectionSize<int32_t>(wsPatterns);
   for (int32_t i = 0; i < iCount && !bRet; i++) {
-    CFX_WideString wsFormat = wsPatterns[i];
+    WideString wsFormat = wsPatterns[i];
     switch (ValueCategory(pFormat->GetCategory(wsFormat), m_dwType)) {
       case FX_LOCALECATEGORY_Null:
         bRet = pFormat->ParseNull(wsValue, wsFormat);
@@ -631,7 +631,7 @@ bool CXFA_LocaleValue::ParsePatternValue(const CFX_WideString& wsValue,
           m_wsValue = L"0";
         break;
       case FX_LOCALECATEGORY_Num: {
-        CFX_WideString fNum;
+        WideString fNum;
         bRet = pFormat->ParseNum(wsValue, wsFormat, &fNum);
         if (bRet)
           m_wsValue = fNum;
@@ -682,7 +682,7 @@ bool CXFA_LocaleValue::ParsePatternValue(const CFX_WideString& wsValue,
   return bRet;
 }
 
-void CXFA_LocaleValue::GetNumericFormat(CFX_WideString& wsFormat,
+void CXFA_LocaleValue::GetNumericFormat(WideString& wsFormat,
                                         int32_t nIntLen,
                                         int32_t nDecLen) {
   ASSERT(wsFormat.IsEmpty());
@@ -718,8 +718,8 @@ void CXFA_LocaleValue::GetNumericFormat(CFX_WideString& wsFormat,
   wsFormat.ReleaseBuffer(nTotalLen);
 }
 
-bool CXFA_LocaleValue::ValidateNumericTemp(const CFX_WideString& wsNumeric,
-                                           const CFX_WideString& wsFormat,
+bool CXFA_LocaleValue::ValidateNumericTemp(const WideString& wsNumeric,
+                                           const WideString& wsFormat,
                                            IFX_Locale* pLocale) {
   if (wsFormat.IsEmpty() || wsNumeric.IsEmpty())
     return true;
@@ -761,15 +761,15 @@ bool CXFA_LocaleValue::ValidateNumericTemp(const CFX_WideString& wsNumeric,
     ++nf;
   }
 
-  CFX_WideString wsDecimalSymbol;
+  WideString wsDecimalSymbol;
   if (pLocale)
     wsDecimalSymbol = pLocale->GetNumbericSymbol(FX_LOCALENUMSYMBOL_Decimal);
   else
-    wsDecimalSymbol = CFX_WideString(L'.');
+    wsDecimalSymbol = WideString(L'.');
 
   if (pFmt[nf] != L'.')
     return false;
-  if (wsDecimalSymbol != CFX_WideStringC(c) && c != L'.')
+  if (wsDecimalSymbol != WideStringView(c) && c != L'.')
     return false;
 
   ++nf;
diff --git a/xfa/fxfa/parser/cxfa_localevalue.h b/xfa/fxfa/parser/cxfa_localevalue.h
index caf4b0c0f1..d49376332d 100644
--- a/xfa/fxfa/parser/cxfa_localevalue.h
+++ b/xfa/fxfa/parser/cxfa_localevalue.h
@@ -31,34 +31,32 @@ class CXFA_LocaleValue {
   CXFA_LocaleValue(const CXFA_LocaleValue& value);
   CXFA_LocaleValue(uint32_t dwType, CXFA_LocaleMgr* pLocaleMgr);
   CXFA_LocaleValue(uint32_t dwType,
-                   const CFX_WideString& wsValue,
+                   const WideString& wsValue,
                    CXFA_LocaleMgr* pLocaleMgr);
   CXFA_LocaleValue(uint32_t dwType,
-                   const CFX_WideString& wsValue,
-                   const CFX_WideString& wsFormat,
+                   const WideString& wsValue,
+                   const WideString& wsFormat,
                    IFX_Locale* pLocale,
                    CXFA_LocaleMgr* pLocaleMgr);
   ~CXFA_LocaleValue();
   CXFA_LocaleValue& operator=(const CXFA_LocaleValue& value);
 
-  bool ValidateValue(const CFX_WideString& wsValue,
-                     const CFX_WideString& wsPattern,
+  bool ValidateValue(const WideString& wsValue,
+                     const WideString& wsPattern,
                      IFX_Locale* pLocale,
-                     CFX_WideString* pMatchFormat);
+                     WideString* pMatchFormat);
 
-  bool FormatPatterns(CFX_WideString& wsResult,
-                      const CFX_WideString& wsFormat,
+  bool FormatPatterns(WideString& wsResult,
+                      const WideString& wsFormat,
                       IFX_Locale* pLocale,
                       XFA_VALUEPICTURE eValueType) const;
 
-  void GetNumericFormat(CFX_WideString& wsFormat,
-                        int32_t nIntLen,
-                        int32_t nDecLen);
-  bool ValidateNumericTemp(const CFX_WideString& wsNumeric,
-                           const CFX_WideString& wsFormat,
+  void GetNumericFormat(WideString& wsFormat, int32_t nIntLen, int32_t nDecLen);
+  bool ValidateNumericTemp(const WideString& wsNumeric,
+                           const WideString& wsFormat,
                            IFX_Locale* pLocale);
 
-  CFX_WideString GetValue() const { return m_wsValue; }
+  WideString GetValue() const { return m_wsValue; }
   uint32_t GetType() const { return m_dwType; }
   double GetDoubleNum() const;
   bool SetDate(const CFX_DateTime& d);
@@ -68,24 +66,23 @@ class CXFA_LocaleValue {
   bool IsValid() const { return m_bValid; }
 
  private:
-  bool FormatSinglePattern(CFX_WideString& wsResult,
-                           const CFX_WideString& wsFormat,
+  bool FormatSinglePattern(WideString& wsResult,
+                           const WideString& wsFormat,
                            IFX_Locale* pLocale,
                            XFA_VALUEPICTURE eValueType) const;
-  bool ValidateCanonicalValue(const CFX_WideString& wsValue, uint32_t dwVType);
-  bool ValidateCanonicalDate(const CFX_WideString& wsDate,
-                             CFX_DateTime* unDate);
-  bool ValidateCanonicalTime(const CFX_WideString& wsTime);
+  bool ValidateCanonicalValue(const WideString& wsValue, uint32_t dwVType);
+  bool ValidateCanonicalDate(const WideString& wsDate, CFX_DateTime* unDate);
+  bool ValidateCanonicalTime(const WideString& wsTime);
 
   bool SetTime(const CFX_DateTime& t);
   bool SetDateTime(const CFX_DateTime& dt);
 
-  bool ParsePatternValue(const CFX_WideString& wsValue,
-                         const CFX_WideString& wsPattern,
+  bool ParsePatternValue(const WideString& wsValue,
+                         const WideString& wsPattern,
                          IFX_Locale* pLocale);
 
   CXFA_LocaleMgr* m_pLocaleMgr;
-  CFX_WideString m_wsValue;
+  WideString m_wsValue;
   uint32_t m_dwType;
   bool m_bValid;
 };
diff --git a/xfa/fxfa/parser/cxfa_measurement.cpp b/xfa/fxfa/parser/cxfa_measurement.cpp
index 1c427209f9..24b5ba2f59 100644
--- a/xfa/fxfa/parser/cxfa_measurement.cpp
+++ b/xfa/fxfa/parser/cxfa_measurement.cpp
@@ -18,7 +18,7 @@ constexpr float kPtToPc = 12;
 
 }  // namespace
 
-CXFA_Measurement::CXFA_Measurement(const CFX_WideStringC& wsMeasure) {
+CXFA_Measurement::CXFA_Measurement(const WideStringView& wsMeasure) {
   SetString(wsMeasure);
 }
 
@@ -30,7 +30,7 @@ CXFA_Measurement::CXFA_Measurement(float fValue, XFA_UNIT eUnit) {
   Set(fValue, eUnit);
 }
 
-void CXFA_Measurement::SetString(const CFX_WideStringC& wsMeasure) {
+void CXFA_Measurement::SetString(const WideStringView& wsMeasure) {
   if (wsMeasure.IsEmpty()) {
     m_fValue = 0;
     m_eUnit = XFA_UNIT_Unknown;
@@ -45,7 +45,7 @@ void CXFA_Measurement::SetString(const CFX_WideStringC& wsMeasure) {
   Set(fValue, eUnit);
 }
 
-bool CXFA_Measurement::ToString(CFX_WideString* wsMeasure) const {
+bool CXFA_Measurement::ToString(WideString* wsMeasure) const {
   switch (GetUnit()) {
     case XFA_UNIT_Mm:
       wsMeasure->Format(L"%.8gmm", GetValue());
@@ -135,7 +135,7 @@ bool CXFA_Measurement::ToUnitInternal(XFA_UNIT eUnit, float* fValue) const {
 }
 
 // static
-XFA_UNIT CXFA_Measurement::GetUnitFromString(const CFX_WideStringC& wsUnit) {
+XFA_UNIT CXFA_Measurement::GetUnitFromString(const WideStringView& wsUnit) {
   if (wsUnit == L"mm")
     return XFA_UNIT_Mm;
   if (wsUnit == L"pt")
diff --git a/xfa/fxfa/parser/cxfa_measurement.h b/xfa/fxfa/parser/cxfa_measurement.h
index 2c03ec0dc6..0212ea1729 100644
--- a/xfa/fxfa/parser/cxfa_measurement.h
+++ b/xfa/fxfa/parser/cxfa_measurement.h
@@ -13,11 +13,11 @@
 
 class CXFA_Measurement {
  public:
-  explicit CXFA_Measurement(const CFX_WideStringC& wsMeasure);
+  explicit CXFA_Measurement(const WideStringView& wsMeasure);
   CXFA_Measurement();
   CXFA_Measurement(float fValue, XFA_UNIT eUnit);
 
-  static XFA_UNIT GetUnitFromString(const CFX_WideStringC& wsUnit);
+  static XFA_UNIT GetUnitFromString(const WideStringView& wsUnit);
 
   void Set(float fValue, XFA_UNIT eUnit) {
     m_fValue = fValue;
@@ -27,11 +27,11 @@ class CXFA_Measurement {
   XFA_UNIT GetUnit() const { return m_eUnit; }
   float GetValue() const { return m_fValue; }
 
-  bool ToString(CFX_WideString* wsMeasure) const;
+  bool ToString(WideString* wsMeasure) const;
   float ToUnit(XFA_UNIT eUnit) const;
 
  private:
-  void SetString(const CFX_WideStringC& wsMeasure);
+  void SetString(const WideStringView& wsMeasure);
   bool ToUnitInternal(XFA_UNIT eUnit, float* fValue) const;
 
   float m_fValue;
diff --git a/xfa/fxfa/parser/cxfa_node.cpp b/xfa/fxfa/parser/cxfa_node.cpp
index 2f741c59e6..1dc20485ab 100644
--- a/xfa/fxfa/parser/cxfa_node.cpp
+++ b/xfa/fxfa/parser/cxfa_node.cpp
@@ -40,12 +40,12 @@
 namespace {
 
 void XFA_DeleteWideString(void* pData) {
-  delete static_cast<CFX_WideString*>(pData);
+  delete static_cast<WideString*>(pData);
 }
 
 void XFA_CopyWideString(void*& pData) {
   if (pData) {
-    CFX_WideString* pNewData = new CFX_WideString(*(CFX_WideString*)pData);
+    WideString* pNewData = new WideString(*(WideString*)pData);
     pData = pNewData;
   }
 }
@@ -74,8 +74,8 @@ int32_t GetCount(CXFA_Node* pInstMgrNode) {
       continue;
     }
     if (iCount == 0) {
-      CFX_WideStringC wsName = pNode->GetCData(XFA_ATTRIBUTE_Name);
-      CFX_WideStringC wsInstName = pInstMgrNode->GetCData(XFA_ATTRIBUTE_Name);
+      WideStringView wsName = pNode->GetCData(XFA_ATTRIBUTE_Name);
+      WideStringView wsInstName = pInstMgrNode->GetCData(XFA_ATTRIBUTE_Name);
       if (wsInstName.GetLength() < 1 || wsInstName[0] != '_' ||
           wsInstName.Right(wsInstName.GetLength() - 1) != wsName) {
         return iCount;
@@ -195,8 +195,8 @@ CXFA_Node* GetItem(CXFA_Node* pInstMgrNode, int32_t iIndex) {
       continue;
     }
     if (iCount == 0) {
-      CFX_WideStringC wsName = pNode->GetCData(XFA_ATTRIBUTE_Name);
-      CFX_WideStringC wsInstName = pInstMgrNode->GetCData(XFA_ATTRIBUTE_Name);
+      WideStringView wsName = pNode->GetCData(XFA_ATTRIBUTE_Name);
+      WideStringView wsInstName = pInstMgrNode->GetCData(XFA_ATTRIBUTE_Name);
       if (wsInstName.GetLength() < 1 || wsInstName[0] != '_' ||
           wsInstName.Right(wsInstName.GetLength() - 1) != wsName) {
         return nullptr;
@@ -377,7 +377,7 @@ static const XFA_ExecEventParaInfo gs_eventParaInfos[] = {
 };
 
 const XFA_ExecEventParaInfo* GetEventParaInfoByName(
-    const CFX_WideStringC& wsEventName) {
+    const WideStringView& wsEventName) {
   uint32_t uHash = FX_HashCode_GetW(wsEventName, false);
   int32_t iStart = 0;
   int32_t iEnd = (sizeof(gs_eventParaInfos) / sizeof(gs_eventParaInfos[0])) - 1;
@@ -394,10 +394,7 @@ const XFA_ExecEventParaInfo* GetEventParaInfoByName(
   return nullptr;
 }
 
-void StrToRGB(const CFX_WideString& strRGB,
-              int32_t& r,
-              int32_t& g,
-              int32_t& b) {
+void StrToRGB(const WideString& strRGB, int32_t& r, int32_t& g, int32_t& b) {
   r = 0;
   g = 0;
   b = 0;
@@ -434,7 +431,7 @@ enum XFA_KEYTYPE {
   XFA_KEYTYPE_Element,
 };
 
-void* GetMapKey_Custom(const CFX_WideStringC& wsKey) {
+void* GetMapKey_Custom(const WideStringView& wsKey) {
   uint32_t dwKey = FX_HashCode_GetW(wsKey, false);
   return (void*)(uintptr_t)((dwKey << 1) | XFA_KEYTYPE_Custom);
 }
@@ -481,7 +478,7 @@ CXFA_Node::CXFA_Node(CXFA_Document* pDoc,
                      uint16_t ePacket,
                      XFA_ObjectType oType,
                      XFA_Element eType,
-                     const CFX_WideStringC& elementName)
+                     const WideStringView& elementName)
     : CXFA_Object(pDoc, oType, eType, elementName),
       m_pNext(nullptr),
       m_pChild(nullptr),
@@ -520,12 +517,12 @@ CXFA_Node* CXFA_Node::Clone(bool bRecursive) {
   if (IsNeedSavingXMLNode()) {
     std::unique_ptr<CFX_XMLNode> pCloneXML;
     if (IsAttributeInXML()) {
-      CFX_WideString wsName;
+      WideString wsName;
       GetAttribute(XFA_ATTRIBUTE_Name, wsName, false);
       auto pCloneXMLElement = pdfium::MakeUnique<CFX_XMLElement>(wsName);
-      CFX_WideStringC wsValue = GetCData(XFA_ATTRIBUTE_Value);
+      WideStringView wsValue = GetCData(XFA_ATTRIBUTE_Value);
       if (!wsValue.IsEmpty()) {
-        pCloneXMLElement->SetTextData(CFX_WideString(wsValue));
+        pCloneXMLElement->SetTextData(WideString(wsValue));
       }
       pCloneXML.reset(pCloneXMLElement.release());
       pClone->SetEnum(XFA_ATTRIBUTE_Contains, XFA_ATTRIBUTEENUM_Unknown);
@@ -802,7 +799,7 @@ CXFA_WidgetData* CXFA_Node::GetContainerWidgetData() {
             XFA_ATTRIBUTEENUM_MultiSelect) {
       return nullptr;
     } else {
-      CFX_WideString wsPicture;
+      WideString wsPicture;
       if (pFieldWidgetData) {
         pFieldWidgetData->GetPictureContent(wsPicture,
                                             XFA_VALUEPICTURE_DataBind);
@@ -846,7 +843,7 @@ CXFA_WidgetData* CXFA_Node::GetContainerWidgetData() {
                             : nullptr;
 }
 
-bool CXFA_Node::GetLocaleName(CFX_WideString& wsLocaleName) {
+bool CXFA_Node::GetLocaleName(WideString& wsLocaleName) {
   CXFA_Node* pForm = GetDocument()->GetXFAObject(XFA_HASHCODE_Form)->AsNode();
   CXFA_Node* pTopSubform = pForm->GetFirstChildByClass(XFA_Element::Subform);
   ASSERT(pTopSubform);
@@ -971,8 +968,8 @@ void CXFA_Node::Script_TreeClass_ResolveNode(CFXJSE_Arguments* pArguments) {
     ThrowParamCountMismatchException(L"resolveNode");
     return;
   }
-  CFX_WideString wsExpression =
-      CFX_WideString::FromUTF8(pArguments->GetUTF8String(0).AsStringC());
+  WideString wsExpression =
+      WideString::FromUTF8(pArguments->GetUTF8String(0).AsStringView());
   CXFA_ScriptContext* pScriptContext = m_pDocument->GetScriptContext();
   if (!pScriptContext)
     return;
@@ -984,7 +981,7 @@ void CXFA_Node::Script_TreeClass_ResolveNode(CFXJSE_Arguments* pArguments) {
                     XFA_RESOLVENODE_Siblings;
   XFA_RESOLVENODE_RS resoveNodeRS;
   int32_t iRet = pScriptContext->ResolveObjects(
-      refNode, wsExpression.AsStringC(), resoveNodeRS, dwFlag);
+      refNode, wsExpression.AsStringView(), resoveNodeRS, dwFlag);
   if (iRet < 1) {
     pArguments->GetReturnValue()->SetNull();
     return;
@@ -1014,8 +1011,8 @@ void CXFA_Node::Script_TreeClass_ResolveNodes(CFXJSE_Arguments* pArguments) {
     ThrowParamCountMismatchException(L"resolveNodes");
     return;
   }
-  CFX_WideString wsExpression =
-      CFX_WideString::FromUTF8(pArguments->GetUTF8String(0).AsStringC());
+  WideString wsExpression =
+      WideString::FromUTF8(pArguments->GetUTF8String(0).AsStringView());
   CFXJSE_Value* pValue = pArguments->GetReturnValue();
   if (!pValue)
     return;
@@ -1029,7 +1026,7 @@ void CXFA_Node::Script_TreeClass_ResolveNodes(CFXJSE_Arguments* pArguments) {
 }
 
 void CXFA_Node::Script_Som_ResolveNodeList(CFXJSE_Value* pValue,
-                                           CFX_WideString wsExpression,
+                                           WideString wsExpression,
                                            uint32_t dwFlag,
                                            CXFA_Node* refNode) {
   CXFA_ScriptContext* pScriptContext = m_pDocument->GetScriptContext();
@@ -1038,7 +1035,7 @@ void CXFA_Node::Script_Som_ResolveNodeList(CFXJSE_Value* pValue,
   XFA_RESOLVENODE_RS resoveNodeRS;
   if (!refNode)
     refNode = this;
-  pScriptContext->ResolveObjects(refNode, wsExpression.AsStringC(),
+  pScriptContext->ResolveObjects(refNode, wsExpression.AsStringView(),
                                  resoveNodeRS, dwFlag);
   CXFA_ArrayNodeList* pNodeList = new CXFA_ArrayNodeList(m_pDocument.Get());
   if (resoveNodeRS.dwFlags == XFA_RESOVENODE_RSTYPE_Nodes) {
@@ -1067,9 +1064,9 @@ void CXFA_Node::Script_TreeClass_All(CFXJSE_Value* pValue,
   }
 
   uint32_t dwFlag = XFA_RESOLVENODE_Siblings | XFA_RESOLVENODE_ALL;
-  CFX_WideString wsName;
+  WideString wsName;
   GetAttribute(XFA_ATTRIBUTE_Name, wsName);
-  CFX_WideString wsExpression = wsName + L"[*]";
+  WideString wsExpression = wsName + L"[*]";
   Script_Som_ResolveNodeList(pValue, wsExpression, dwFlag);
 }
 
@@ -1080,8 +1077,8 @@ void CXFA_Node::Script_TreeClass_Nodes(CFXJSE_Value* pValue,
   if (!pScriptContext)
     return;
   if (bSetting) {
-    CFX_WideString wsMessage = L"Unable to set ";
-    FXJSE_ThrowMessage(wsMessage.UTF8Encode().AsStringC());
+    WideString wsMessage = L"Unable to set ";
+    FXJSE_ThrowMessage(wsMessage.UTF8Encode().AsStringView());
   } else {
     CXFA_AttachNodeList* pNodeList =
         new CXFA_AttachNodeList(m_pDocument.Get(), this);
@@ -1097,7 +1094,7 @@ void CXFA_Node::Script_TreeClass_ClassAll(CFXJSE_Value* pValue,
     return;
   }
   uint32_t dwFlag = XFA_RESOLVENODE_Siblings | XFA_RESOLVENODE_ALL;
-  CFX_WideString wsExpression = L"#" + GetClassName() + L"[*]";
+  WideString wsExpression = L"#" + GetClassName() + L"[*]";
   Script_Som_ResolveNodeList(pValue, wsExpression, dwFlag);
 }
 
@@ -1143,9 +1140,9 @@ void CXFA_Node::Script_TreeClass_SomExpression(CFXJSE_Value* pValue,
     ThrowInvalidPropertyException();
     return;
   }
-  CFX_WideString wsSOMExpression;
+  WideString wsSOMExpression;
   GetSOMExpression(wsSOMExpression);
-  pValue->SetString(wsSOMExpression.UTF8Encode().AsStringC());
+  pValue->SetString(wsSOMExpression.UTF8Encode().AsStringView());
 }
 
 void CXFA_Node::Script_NodeClass_ApplyXSL(CFXJSE_Arguments* pArguments) {
@@ -1154,8 +1151,8 @@ void CXFA_Node::Script_NodeClass_ApplyXSL(CFXJSE_Arguments* pArguments) {
     ThrowParamCountMismatchException(L"applyXSL");
     return;
   }
-  CFX_WideString wsExpression =
-      CFX_WideString::FromUTF8(pArguments->GetUTF8String(0).AsStringC());
+  WideString wsExpression =
+      WideString::FromUTF8(pArguments->GetUTF8String(0).AsStringView());
   // TODO(weili): check whether we need to implement this, pdfium:501.
   // For now, just put the variables here to avoid unused variable warning.
   (void)wsExpression;
@@ -1167,14 +1164,13 @@ void CXFA_Node::Script_NodeClass_AssignNode(CFXJSE_Arguments* pArguments) {
     ThrowParamCountMismatchException(L"assignNode");
     return;
   }
-  CFX_WideString wsExpression;
-  CFX_WideString wsValue;
+  WideString wsExpression;
+  WideString wsValue;
   int32_t iAction = 0;
   wsExpression =
-      CFX_WideString::FromUTF8(pArguments->GetUTF8String(0).AsStringC());
+      WideString::FromUTF8(pArguments->GetUTF8String(0).AsStringView());
   if (iLength >= 2) {
-    wsValue =
-        CFX_WideString::FromUTF8(pArguments->GetUTF8String(1).AsStringC());
+    wsValue = WideString::FromUTF8(pArguments->GetUTF8String(1).AsStringView());
   }
   if (iLength >= 3)
     iAction = pArguments->GetInt32(2);
@@ -1203,13 +1199,13 @@ void CXFA_Node::Script_NodeClass_GetAttribute(CFXJSE_Arguments* pArguments) {
     ThrowParamCountMismatchException(L"getAttribute");
     return;
   }
-  CFX_WideString wsExpression =
-      CFX_WideString::FromUTF8(pArguments->GetUTF8String(0).AsStringC());
-  CFX_WideString wsValue;
-  GetAttribute(wsExpression.AsStringC(), wsValue);
+  WideString wsExpression =
+      WideString::FromUTF8(pArguments->GetUTF8String(0).AsStringView());
+  WideString wsValue;
+  GetAttribute(wsExpression.AsStringView(), wsValue);
   CFXJSE_Value* pValue = pArguments->GetReturnValue();
   if (pValue)
-    pValue->SetString(wsValue.UTF8Encode().AsStringC());
+    pValue->SetString(wsValue.UTF8Encode().AsStringView());
 }
 
 void CXFA_Node::Script_NodeClass_GetElement(CFXJSE_Arguments* pArguments) {
@@ -1218,14 +1214,14 @@ void CXFA_Node::Script_NodeClass_GetElement(CFXJSE_Arguments* pArguments) {
     ThrowParamCountMismatchException(L"getElement");
     return;
   }
-  CFX_WideString wsExpression;
+  WideString wsExpression;
   int32_t iValue = 0;
   wsExpression =
-      CFX_WideString::FromUTF8(pArguments->GetUTF8String(0).AsStringC());
+      WideString::FromUTF8(pArguments->GetUTF8String(0).AsStringView());
   if (iLength >= 2)
     iValue = pArguments->GetInt32(1);
-  CXFA_Node* pNode =
-      GetProperty(iValue, XFA_GetElementTypeForName(wsExpression.AsStringC()));
+  CXFA_Node* pNode = GetProperty(
+      iValue, XFA_GetElementTypeForName(wsExpression.AsStringView()));
   pArguments->GetReturnValue()->Assign(
       m_pDocument->GetScriptContext()->GetJSValueFromMap(pNode));
 }
@@ -1242,15 +1238,15 @@ void CXFA_Node::Script_NodeClass_IsPropertySpecified(
   if (!pValue)
     return;
 
-  CFX_WideString wsExpression =
-      CFX_WideString::FromUTF8(pArguments->GetUTF8String(0).AsStringC());
+  WideString wsExpression =
+      WideString::FromUTF8(pArguments->GetUTF8String(0).AsStringView());
   const XFA_ATTRIBUTEINFO* pAttributeInfo =
-      XFA_GetAttributeByName(wsExpression.AsStringC());
+      XFA_GetAttributeByName(wsExpression.AsStringView());
   bool bHas = pAttributeInfo ? HasAttribute(pAttributeInfo->eName) : false;
   if (!bHas) {
     bool bParent = iLength < 2 || pArguments->GetInt32(1);
     int32_t iIndex = iLength == 3 ? pArguments->GetInt32(2) : 0;
-    XFA_Element eType = XFA_GetElementTypeForName(wsExpression.AsStringC());
+    XFA_Element eType = XFA_GetElementTypeForName(wsExpression.AsStringView());
     bHas = !!GetProperty(iIndex, eType);
     if (!bHas && bParent && m_pParent) {
       // Also check on the parent.
@@ -1271,7 +1267,7 @@ void CXFA_Node::Script_NodeClass_LoadXML(CFXJSE_Arguments* pArguments) {
 
   bool bIgnoreRoot = true;
   bool bOverwrite = 0;
-  CFX_ByteString wsExpression = pArguments->GetUTF8String(0);
+  ByteString wsExpression = pArguments->GetUTF8String(0);
   if (wsExpression.IsEmpty())
     return;
   if (iLength >= 2)
@@ -1291,10 +1287,9 @@ void CXFA_Node::Script_NodeClass_LoadXML(CFXJSE_Arguments* pArguments) {
     bIgnoreRoot = false;
   }
   CXFA_Node* pFakeRoot = Clone(false);
-  CFX_WideStringC wsContentType = GetCData(XFA_ATTRIBUTE_ContentType);
+  WideStringView wsContentType = GetCData(XFA_ATTRIBUTE_ContentType);
   if (!wsContentType.IsEmpty()) {
-    pFakeRoot->SetCData(XFA_ATTRIBUTE_ContentType,
-                        CFX_WideString(wsContentType));
+    pFakeRoot->SetCData(XFA_ATTRIBUTE_ContentType, WideString(wsContentType));
   }
 
   std::unique_ptr<CFX_XMLNode> pFakeXMLRoot(pFakeRoot->GetXMLMappingNode());
@@ -1304,7 +1299,7 @@ void CXFA_Node::Script_NodeClass_LoadXML(CFXJSE_Arguments* pArguments) {
   }
   if (!pFakeXMLRoot) {
     pFakeXMLRoot =
-        pdfium::MakeUnique<CFX_XMLElement>(CFX_WideString(GetClassName()));
+        pdfium::MakeUnique<CFX_XMLElement>(WideString(GetClassName()));
   }
 
   if (bIgnoreRoot) {
@@ -1391,7 +1386,7 @@ void CXFA_Node::Script_NodeClass_SaveXML(CFXJSE_Arguments* pArguments) {
     }
     bPrettyMode = true;
   }
-  CFX_WideString bsXMLHeader = L"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
+  WideString bsXMLHeader = L"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
   if (GetPacketID() == XFA_XDPPACKET_Form ||
       GetPacketID() == XFA_XDPPACKET_Datasets) {
     CFX_XMLNode* pElement = nullptr;
@@ -1399,7 +1394,7 @@ void CXFA_Node::Script_NodeClass_SaveXML(CFXJSE_Arguments* pArguments) {
       pElement = GetXMLMappingNode();
       if (!pElement || pElement->GetType() != FX_XMLNODE_Element) {
         pArguments->GetReturnValue()->SetString(
-            bsXMLHeader.UTF8Encode().AsStringC());
+            bsXMLHeader.UTF8Encode().AsStringView());
         return;
       }
       XFA_DataExporter_DealWithDataGroupNode(this);
@@ -1408,7 +1403,7 @@ void CXFA_Node::Script_NodeClass_SaveXML(CFXJSE_Arguments* pArguments) {
     auto pStream =
         pdfium::MakeRetain<CFX_SeekableStreamProxy>(pMemoryStream, true);
     pStream->SetCodePage(FX_CODEPAGE_UTF8);
-    pStream->WriteString(bsXMLHeader.AsStringC());
+    pStream->WriteString(bsXMLHeader.AsStringView());
 
     if (GetPacketID() == XFA_XDPPACKET_Form)
       XFA_DataExporter_RegenerateFormFile(this, pStream, nullptr, true);
@@ -1418,7 +1413,7 @@ void CXFA_Node::Script_NodeClass_SaveXML(CFXJSE_Arguments* pArguments) {
     // For now, just put it here to avoid unused variable warning.
     (void)bPrettyMode;
     pArguments->GetReturnValue()->SetString(
-        CFX_ByteStringC(pMemoryStream->GetBuffer(), pMemoryStream->GetSize()));
+        ByteStringView(pMemoryStream->GetBuffer(), pMemoryStream->GetSize()));
     return;
   }
   pArguments->GetReturnValue()->SetString("");
@@ -1430,11 +1425,12 @@ void CXFA_Node::Script_NodeClass_SetAttribute(CFXJSE_Arguments* pArguments) {
     ThrowParamCountMismatchException(L"setAttribute");
     return;
   }
-  CFX_WideString wsAttributeValue =
-      CFX_WideString::FromUTF8(pArguments->GetUTF8String(0).AsStringC());
-  CFX_WideString wsAttribute =
-      CFX_WideString::FromUTF8(pArguments->GetUTF8String(1).AsStringC());
-  SetAttribute(wsAttribute.AsStringC(), wsAttributeValue.AsStringC(), true);
+  WideString wsAttributeValue =
+      WideString::FromUTF8(pArguments->GetUTF8String(0).AsStringView());
+  WideString wsAttribute =
+      WideString::FromUTF8(pArguments->GetUTF8String(1).AsStringView());
+  SetAttribute(wsAttribute.AsStringView(), wsAttributeValue.AsStringView(),
+               true);
 }
 
 void CXFA_Node::Script_NodeClass_SetElement(CFXJSE_Arguments* pArguments) {
@@ -1444,10 +1440,10 @@ void CXFA_Node::Script_NodeClass_SetElement(CFXJSE_Arguments* pArguments) {
     return;
   }
   CXFA_Node* pNode = nullptr;
-  CFX_WideString wsName;
+  WideString wsName;
   pNode = static_cast<CXFA_Node*>(pArguments->GetObject(0));
   if (iLength == 2)
-    wsName = CFX_WideString::FromUTF8(pArguments->GetUTF8String(1).AsStringC());
+    wsName = WideString::FromUTF8(pArguments->GetUTF8String(1).AsStringView());
   // TODO(weili): check whether we need to implement this, pdfium:501.
   // For now, just put the variables here to avoid unused variable warning.
   (void)pNode;
@@ -1462,9 +1458,9 @@ void CXFA_Node::Script_NodeClass_Ns(CFXJSE_Value* pValue,
     return;
   }
 
-  CFX_WideString wsNameSpace;
+  WideString wsNameSpace;
   TryNamespace(wsNameSpace);
-  pValue->SetString(wsNameSpace.UTF8Encode().AsStringC());
+  pValue->SetString(wsNameSpace.UTF8Encode().AsStringView());
 }
 
 void CXFA_Node::Script_NodeClass_Model(CFXJSE_Value* pValue,
@@ -1499,7 +1495,7 @@ void CXFA_Node::Script_NodeClass_IsNull(CFXJSE_Value* pValue,
     pValue->SetBoolean(false);
     return;
   }
-  CFX_WideString strValue;
+  WideString strValue;
   pValue->SetBoolean(!TryContent(strValue) || strValue.IsEmpty());
 }
 
@@ -1538,12 +1534,12 @@ void CXFA_Node::Script_ModelClass_IsCompatibleNS(CFXJSE_Arguments* pArguments) {
     ThrowParamCountMismatchException(L"isCompatibleNS");
     return;
   }
-  CFX_WideString wsNameSpace;
+  WideString wsNameSpace;
   if (iLength >= 1) {
-    CFX_ByteString bsNameSpace = pArguments->GetUTF8String(0);
-    wsNameSpace = CFX_WideString::FromUTF8(bsNameSpace.AsStringC());
+    ByteString bsNameSpace = pArguments->GetUTF8String(0);
+    wsNameSpace = WideString::FromUTF8(bsNameSpace.AsStringView());
   }
-  CFX_WideString wsNodeNameSpace;
+  WideString wsNodeNameSpace;
   TryNamespace(wsNodeNameSpace);
   CFXJSE_Value* pValue = pArguments->GetReturnValue();
   if (pValue)
@@ -1755,8 +1751,8 @@ void CXFA_Node::Script_Attribute_String(CFXJSE_Value* pValue,
                                         bool bSetting,
                                         XFA_ATTRIBUTE eAttribute) {
   if (bSetting) {
-    CFX_WideString wsValue = pValue->ToWideString();
-    SetAttribute(eAttribute, wsValue.AsStringC(), true);
+    WideString wsValue = pValue->ToWideString();
+    SetAttribute(eAttribute, wsValue.AsStringView(), true);
     if (eAttribute == XFA_ATTRIBUTE_Use &&
         GetElementType() == XFA_Element::Desc) {
       CXFA_Node* pTemplateNode =
@@ -1765,11 +1761,11 @@ void CXFA_Node::Script_Attribute_String(CFXJSE_Value* pValue,
           pTemplateNode->GetFirstChildByClass(XFA_Element::Subform)
               ->GetFirstChildByClass(XFA_Element::Proto);
 
-      CFX_WideString wsID;
-      CFX_WideString wsSOM;
+      WideString wsID;
+      WideString wsSOM;
       if (!wsValue.IsEmpty()) {
         if (wsValue[0] == '#') {
-          wsID = CFX_WideString(wsValue.c_str() + 1, wsValue.GetLength() - 1);
+          wsID = WideString(wsValue.c_str() + 1, wsValue.GetLength() - 1);
         } else {
           wsSOM = wsValue;
         }
@@ -1782,12 +1778,12 @@ void CXFA_Node::Script_Attribute_String(CFXJSE_Value* pValue,
                           XFA_RESOLVENODE_Siblings;
         XFA_RESOLVENODE_RS resoveNodeRS;
         int32_t iRet = m_pDocument->GetScriptContext()->ResolveObjects(
-            pProtoRoot, wsSOM.AsStringC(), resoveNodeRS, dwFlag);
+            pProtoRoot, wsSOM.AsStringView(), resoveNodeRS, dwFlag);
         if (iRet > 0 && resoveNodeRS.objects.front()->IsNode()) {
           pProtoNode = resoveNodeRS.objects.front()->AsNode();
         }
       } else if (!wsID.IsEmpty()) {
-        pProtoNode = m_pDocument->GetNodeByID(pProtoRoot, wsID.AsStringC());
+        pProtoNode = m_pDocument->GetNodeByID(pProtoRoot, wsID.AsStringView());
       }
       if (pProtoNode) {
         CXFA_Node* pHeadChild = GetNodeItem(XFA_NODEITEM_FirstChild);
@@ -1811,9 +1807,9 @@ void CXFA_Node::Script_Attribute_String(CFXJSE_Value* pValue,
       }
     }
   } else {
-    CFX_WideString wsValue;
+    WideString wsValue;
     GetAttribute(eAttribute, wsValue);
-    pValue->SetString(wsValue.UTF8Encode().AsStringC());
+    pValue->SetString(wsValue.UTF8Encode().AsStringView());
   }
 }
 
@@ -1825,9 +1821,9 @@ void CXFA_Node::Script_Attribute_StringRead(CFXJSE_Value* pValue,
     return;
   }
 
-  CFX_WideString wsValue;
+  WideString wsValue;
   GetAttribute(eAttribute, wsValue);
-  pValue->SetString(wsValue.UTF8Encode().AsStringC());
+  pValue->SetString(wsValue.UTF8Encode().AsStringView());
 }
 
 void CXFA_Node::Script_WsdlConnection_Execute(CFXJSE_Arguments* pArguments) {
@@ -1891,7 +1887,7 @@ void CXFA_Node::Script_Som_Message(CFXJSE_Value* pValue,
       pNotify->AddCalcValidate(this);
     }
   } else {
-    CFX_WideString wsMessage;
+    WideString wsMessage;
     switch (iMessageType) {
       case XFA_SOM_ValidationMessage:
         validate.GetScriptMessageText(wsMessage);
@@ -1905,7 +1901,7 @@ void CXFA_Node::Script_Som_Message(CFXJSE_Value* pValue,
       default:
         break;
     }
-    pValue->SetString(wsMessage.UTF8Encode().AsStringC());
+    pValue->SetString(wsMessage.UTF8Encode().AsStringView());
   }
 }
 
@@ -1948,14 +1944,14 @@ void CXFA_Node::Script_Som_DefaultValue(CFXJSE_Value* pValue,
     return;
   }
   if (bSetting) {
-    CFX_WideString wsNewValue;
+    WideString wsNewValue;
     if (!(pValue && (pValue->IsNull() || pValue->IsUndefined())))
       wsNewValue = pValue->ToWideString();
 
-    CFX_WideString wsFormatValue(wsNewValue);
+    WideString wsFormatValue(wsNewValue);
     CXFA_WidgetData* pContainerWidgetData = nullptr;
     if (GetPacketID() == XFA_XDPPACKET_Datasets) {
-      CFX_WideString wsPicture;
+      WideString wsPicture;
       for (CXFA_Node* pFormNode : GetBindItems()) {
         if (!pFormNode || pFormNode->HasRemovedChildren())
           continue;
@@ -1976,17 +1972,17 @@ void CXFA_Node::Script_Som_DefaultValue(CFXJSE_Value* pValue,
     }
     SetScriptContent(wsNewValue, wsFormatValue, true, true);
   } else {
-    CFX_WideString content = GetScriptContent(true);
+    WideString content = GetScriptContent(true);
     if (content.IsEmpty() && eType != XFA_Element::Text &&
         eType != XFA_Element::SubmitUrl) {
       pValue->SetNull();
     } else if (eType == XFA_Element::Integer) {
       pValue->SetInteger(FXSYS_wtoi(content.c_str()));
     } else if (eType == XFA_Element::Float || eType == XFA_Element::Decimal) {
-      CFX_Decimal decimal(content.AsStringC());
+      CFX_Decimal decimal(content.AsStringView());
       pValue->SetFloat((float)(double)decimal);
     } else {
-      pValue->SetString(content.UTF8Encode().AsStringC());
+      pValue->SetString(content.UTF8Encode().AsStringView());
     }
   }
 }
@@ -1999,32 +1995,32 @@ void CXFA_Node::Script_Som_DefaultValue_Read(CFXJSE_Value* pValue,
     return;
   }
 
-  CFX_WideString content = GetScriptContent(true);
+  WideString content = GetScriptContent(true);
   if (content.IsEmpty()) {
     pValue->SetNull();
     return;
   }
-  pValue->SetString(content.UTF8Encode().AsStringC());
+  pValue->SetString(content.UTF8Encode().AsStringView());
 }
 
 void CXFA_Node::Script_Boolean_Value(CFXJSE_Value* pValue,
                                      bool bSetting,
                                      XFA_ATTRIBUTE eAttribute) {
   if (bSetting) {
-    CFX_ByteString newValue;
+    ByteString newValue;
     if (!(pValue && (pValue->IsNull() || pValue->IsUndefined())))
       newValue = pValue->ToString();
 
     int32_t iValue = FXSYS_atoi(newValue.c_str());
-    CFX_WideString wsNewValue(iValue == 0 ? L"0" : L"1");
-    CFX_WideString wsFormatValue(wsNewValue);
+    WideString wsNewValue(iValue == 0 ? L"0" : L"1");
+    WideString wsFormatValue(wsNewValue);
     CXFA_WidgetData* pContainerWidgetData = GetContainerWidgetData();
     if (pContainerWidgetData) {
       pContainerWidgetData->GetFormatDataValue(wsNewValue, wsFormatValue);
     }
     SetScriptContent(wsNewValue, wsFormatValue, true, true);
   } else {
-    CFX_WideString wsValue = GetScriptContent(true);
+    WideString wsValue = GetScriptContent(true);
     pValue->SetBoolean(wsValue == L"1");
   }
 }
@@ -2056,9 +2052,9 @@ void CXFA_Node::Script_Som_BorderColor(CFXJSE_Value* pValue,
     int32_t g;
     int32_t b;
     std::tie(a, r, g, b) = ArgbDecode(color);
-    CFX_WideString strColor;
+    WideString strColor;
     strColor.Format(L"%d,%d,%d", r, g, b);
-    pValue->SetString(strColor.UTF8Encode().AsStringC());
+    pValue->SetString(strColor.UTF8Encode().AsStringView());
   }
 }
 
@@ -2071,19 +2067,19 @@ void CXFA_Node::Script_Som_BorderWidth(CFXJSE_Value* pValue,
   }
   CXFA_Border border = pWidgetData->GetBorder(true);
   int32_t iSize = border.CountEdges();
-  CFX_WideString wsThickness;
+  WideString wsThickness;
   if (bSetting) {
     wsThickness = pValue->ToWideString();
     for (int32_t i = 0; i < iSize; ++i) {
       CXFA_Edge edge = border.GetEdge(i);
-      CXFA_Measurement thickness(wsThickness.AsStringC());
+      CXFA_Measurement thickness(wsThickness.AsStringView());
       edge.SetMSThickness(thickness);
     }
   } else {
     CXFA_Edge edge = border.GetEdge(0);
     CXFA_Measurement thickness = edge.GetMSThickness();
     thickness.ToString(&wsThickness);
-    pValue->SetString(wsThickness.UTF8Encode().AsStringC());
+    pValue->SetString(wsThickness.UTF8Encode().AsStringView());
   }
 }
 
@@ -2114,9 +2110,9 @@ void CXFA_Node::Script_Som_FillColor(CFXJSE_Value* pValue,
     int32_t g;
     int32_t b;
     std::tie(a, r, g, b) = ArgbDecode(color);
-    CFX_WideString wsColor;
+    WideString wsColor;
     wsColor.Format(L"%d,%d,%d", r, g, b);
-    pValue->SetString(wsColor.UTF8Encode().AsStringC());
+    pValue->SetString(wsColor.UTF8Encode().AsStringView());
   }
 }
 
@@ -2146,17 +2142,17 @@ void CXFA_Node::Script_Draw_DefaultValue(CFXJSE_Value* pValue,
       ASSERT(pWidgetData);
       XFA_Element uiType = pWidgetData->GetUIType();
       if (uiType == XFA_Element::Text) {
-        CFX_WideString wsNewValue = pValue->ToWideString();
-        CFX_WideString wsFormatValue(wsNewValue);
+        WideString wsNewValue = pValue->ToWideString();
+        WideString wsFormatValue(wsNewValue);
         SetScriptContent(wsNewValue, wsFormatValue, true, true);
       }
     }
   } else {
-    CFX_WideString content = GetScriptContent(true);
+    WideString content = GetScriptContent(true);
     if (content.IsEmpty())
       pValue->SetNull();
     else
-      pValue->SetString(content.UTF8Encode().AsStringC());
+      pValue->SetString(content.UTF8Encode().AsStringView());
   }
 }
 
@@ -2175,7 +2171,7 @@ void CXFA_Node::Script_Field_DefaultValue(CFXJSE_Value* pValue,
       pWidgetData->m_bPreNull = pWidgetData->m_bIsNull;
       pWidgetData->m_bIsNull = false;
     }
-    CFX_WideString wsNewText;
+    WideString wsNewText;
     if (!(pValue && (pValue->IsNull() || pValue->IsUndefined())))
       wsNewText = pValue->ToWideString();
 
@@ -2189,13 +2185,13 @@ void CXFA_Node::Script_Field_DefaultValue(CFXJSE_Value* pValue,
           pWidgetData->NumericLimit(wsNewText, iLeadDigits, iFracDigits);
     }
     CXFA_WidgetData* pContainerWidgetData = GetContainerWidgetData();
-    CFX_WideString wsFormatText(wsNewText);
+    WideString wsFormatText(wsNewText);
     if (pContainerWidgetData) {
       pContainerWidgetData->GetFormatDataValue(wsNewText, wsFormatText);
     }
     SetScriptContent(wsNewText, wsFormatText, true, true);
   } else {
-    CFX_WideString content = GetScriptContent(true);
+    WideString content = GetScriptContent(true);
     if (content.IsEmpty()) {
       pValue->SetNull();
     } else {
@@ -2205,9 +2201,9 @@ void CXFA_Node::Script_Field_DefaultValue(CFXJSE_Value* pValue,
       if (pNode && pNode->GetElementType() == XFA_Element::Decimal) {
         if (pUIChild->GetElementType() == XFA_Element::NumericEdit &&
             (pNode->GetInteger(XFA_ATTRIBUTE_FracDigits) == -1)) {
-          pValue->SetString(content.UTF8Encode().AsStringC());
+          pValue->SetString(content.UTF8Encode().AsStringView());
         } else {
-          CFX_Decimal decimal(content.AsStringC());
+          CFX_Decimal decimal(content.AsStringView());
           pValue->SetFloat((float)(double)decimal);
         }
       } else if (pNode && pNode->GetElementType() == XFA_Element::Integer) {
@@ -2215,10 +2211,10 @@ void CXFA_Node::Script_Field_DefaultValue(CFXJSE_Value* pValue,
       } else if (pNode && pNode->GetElementType() == XFA_Element::Boolean) {
         pValue->SetBoolean(FXSYS_wtoi(content.c_str()) == 0 ? false : true);
       } else if (pNode && pNode->GetElementType() == XFA_Element::Float) {
-        CFX_Decimal decimal(content.AsStringC());
+        CFX_Decimal decimal(content.AsStringView());
         pValue->SetFloat((float)(double)decimal);
       } else {
-        pValue->SetString(content.UTF8Encode().AsStringC());
+        pValue->SetString(content.UTF8Encode().AsStringView());
       }
     }
   }
@@ -2234,9 +2230,9 @@ void CXFA_Node::Script_Field_EditValue(CFXJSE_Value* pValue,
   if (bSetting) {
     pWidgetData->SetValue(pValue->ToWideString(), XFA_VALUEPICTURE_Edit);
   } else {
-    CFX_WideString wsValue;
+    WideString wsValue;
     pWidgetData->GetValue(wsValue, XFA_VALUEPICTURE_Edit);
-    pValue->SetString(wsValue.UTF8Encode().AsStringC());
+    pValue->SetString(wsValue.UTF8Encode().AsStringView());
   }
 }
 
@@ -2266,9 +2262,9 @@ void CXFA_Node::Script_Som_FontColor(CFXJSE_Value* pValue,
     int32_t g;
     int32_t b;
     std::tie(a, r, g, b) = ArgbDecode(color);
-    CFX_WideString wsColor;
+    WideString wsColor;
     wsColor.Format(L"%d,%d,%d", r, g, b);
-    pValue->SetString(wsColor.UTF8Encode().AsStringC());
+    pValue->SetString(wsColor.UTF8Encode().AsStringView());
   }
 }
 
@@ -2288,9 +2284,9 @@ void CXFA_Node::Script_Field_FormattedValue(CFXJSE_Value* pValue,
   if (bSetting) {
     pWidgetData->SetValue(pValue->ToWideString(), XFA_VALUEPICTURE_Display);
   } else {
-    CFX_WideString wsValue;
+    WideString wsValue;
     pWidgetData->GetValue(wsValue, XFA_VALUEPICTURE_Display);
-    pValue->SetString(wsValue.UTF8Encode().AsStringC());
+    pValue->SetString(wsValue.UTF8Encode().AsStringView());
   }
 }
 
@@ -2308,10 +2304,10 @@ void CXFA_Node::Script_Som_Mandatory(CFXJSE_Value* pValue,
     int32_t iValue = validate.GetNullTest();
     const XFA_ATTRIBUTEENUMINFO* pInfo =
         GetAttributeEnumByID((XFA_ATTRIBUTEENUM)iValue);
-    CFX_WideString wsValue;
+    WideString wsValue;
     if (pInfo)
       wsValue = pInfo->pName;
-    pValue->SetString(wsValue.UTF8Encode().AsStringC());
+    pValue->SetString(wsValue.UTF8Encode().AsStringView());
   }
 }
 
@@ -2364,9 +2360,9 @@ void CXFA_Node::Script_Field_ExecEvent(CFXJSE_Arguments* pArguments) {
     return;
   }
 
-  CFX_ByteString eventString = pArguments->GetUTF8String(0);
+  ByteString eventString = pArguments->GetUTF8String(0);
   int32_t iRet = execSingleEventByName(
-      CFX_WideString::FromUTF8(eventString.AsStringC()).AsStringC(),
+      WideString::FromUTF8(eventString.AsStringView()).AsStringView(),
       XFA_Element::Field);
   if (eventString != "validate")
     return;
@@ -2421,12 +2417,12 @@ void CXFA_Node::Script_Field_GetSaveItem(CFXJSE_Arguments* pArguments) {
     pArguments->GetReturnValue()->SetNull();
     return;
   }
-  CFX_WideString wsValue;
+  WideString wsValue;
   if (!pWidgetData->GetChoiceListItem(wsValue, iIndex, true)) {
     pArguments->GetReturnValue()->SetNull();
     return;
   }
-  pArguments->GetReturnValue()->SetString(wsValue.UTF8Encode().AsStringC());
+  pArguments->GetReturnValue()->SetString(wsValue.UTF8Encode().AsStringView());
 }
 
 void CXFA_Node::Script_Field_BoundItem(CFXJSE_Arguments* pArguments) {
@@ -2439,13 +2435,13 @@ void CXFA_Node::Script_Field_BoundItem(CFXJSE_Arguments* pArguments) {
   if (!pWidgetData) {
     return;
   }
-  CFX_ByteString bsValue = pArguments->GetUTF8String(0);
-  CFX_WideString wsValue = CFX_WideString::FromUTF8(bsValue.AsStringC());
-  CFX_WideString wsBoundValue;
-  pWidgetData->GetItemValue(wsValue.AsStringC(), wsBoundValue);
+  ByteString bsValue = pArguments->GetUTF8String(0);
+  WideString wsValue = WideString::FromUTF8(bsValue.AsStringView());
+  WideString wsBoundValue;
+  pWidgetData->GetItemValue(wsValue.AsStringView(), wsBoundValue);
   CFXJSE_Value* pValue = pArguments->GetReturnValue();
   if (pValue)
-    pValue->SetString(wsBoundValue.UTF8Encode().AsStringC());
+    pValue->SetString(wsBoundValue.UTF8Encode().AsStringView());
 }
 
 void CXFA_Node::Script_Field_GetItemState(CFXJSE_Arguments* pArguments) {
@@ -2496,12 +2492,12 @@ void CXFA_Node::Script_Field_GetDisplayItem(CFXJSE_Arguments* pArguments) {
     pArguments->GetReturnValue()->SetNull();
     return;
   }
-  CFX_WideString wsValue;
+  WideString wsValue;
   if (!pWidgetData->GetChoiceListItem(wsValue, iIndex, false)) {
     pArguments->GetReturnValue()->SetNull();
     return;
   }
-  pArguments->GetReturnValue()->SetString(wsValue.UTF8Encode().AsStringC());
+  pArguments->GetReturnValue()->SetString(wsValue.UTF8Encode().AsStringView());
 }
 
 void CXFA_Node::Script_Field_SetItemState(CFXJSE_Arguments* pArguments) {
@@ -2533,15 +2529,15 @@ void CXFA_Node::Script_Field_AddItem(CFXJSE_Arguments* pArguments) {
   if (!pWidgetData) {
     return;
   }
-  CFX_WideString wsLabel;
-  CFX_WideString wsValue;
+  WideString wsLabel;
+  WideString wsValue;
   if (iLength >= 1) {
-    CFX_ByteString bsLabel = pArguments->GetUTF8String(0);
-    wsLabel = CFX_WideString::FromUTF8(bsLabel.AsStringC());
+    ByteString bsLabel = pArguments->GetUTF8String(0);
+    wsLabel = WideString::FromUTF8(bsLabel.AsStringView());
   }
   if (iLength >= 2) {
-    CFX_ByteString bsValue = pArguments->GetUTF8String(1);
-    wsValue = CFX_WideString::FromUTF8(bsValue.AsStringC());
+    ByteString bsValue = pArguments->GetUTF8String(1);
+    wsValue = WideString::FromUTF8(bsValue.AsStringView());
   }
   pWidgetData->InsertItem(wsLabel, wsValue, true);
 }
@@ -2579,15 +2575,15 @@ void CXFA_Node::Script_ExclGroup_DefaultAndRawValue(CFXJSE_Value* pValue,
     return;
   }
   if (bSetting) {
-    pWidgetData->SetSelectedMemberByValue(pValue->ToWideString().AsStringC(),
+    pWidgetData->SetSelectedMemberByValue(pValue->ToWideString().AsStringView(),
                                           true, true, true);
   } else {
-    CFX_WideString wsValue = GetScriptContent(true);
+    WideString wsValue = GetScriptContent(true);
     XFA_VERSION curVersion = GetDocument()->GetCurVersionMode();
     if (wsValue.IsEmpty() && curVersion >= XFA_VERSION_300) {
       pValue->SetNull();
     } else {
-      pValue->SetString(wsValue.UTF8Encode().AsStringC());
+      pValue->SetString(wsValue.UTF8Encode().AsStringView());
     }
   }
 }
@@ -2602,9 +2598,9 @@ void CXFA_Node::Script_ExclGroup_ExecEvent(CFXJSE_Arguments* pArguments) {
     return;
   }
 
-  CFX_ByteString eventString = pArguments->GetUTF8String(0);
+  ByteString eventString = pArguments->GetUTF8String(0);
   execSingleEventByName(
-      CFX_WideString::FromUTF8(eventString.AsStringC()).AsStringC(),
+      WideString::FromUTF8(eventString.AsStringView()).AsStringView(),
       XFA_Element::ExclGroup);
 }
 
@@ -2625,10 +2621,10 @@ void CXFA_Node::Script_ExclGroup_SelectedMember(CFXJSE_Arguments* pArguments) {
   if (argc == 0) {
     pReturnNode = pWidgetData->GetSelectedMember();
   } else {
-    CFX_ByteString szName;
+    ByteString szName;
     szName = pArguments->GetUTF8String(0);
     pReturnNode = pWidgetData->SetSelectedMember(
-        CFX_WideString::FromUTF8(szName.AsStringC()).AsStringC(), true);
+        WideString::FromUTF8(szName.AsStringView()).AsStringView(), true);
   }
   if (!pReturnNode) {
     pArguments->GetReturnValue()->SetNull();
@@ -2725,12 +2721,12 @@ void CXFA_Node::Script_Subform_InstanceManager(CFXJSE_Value* pValue,
     return;
   }
 
-  CFX_WideStringC wsName = GetCData(XFA_ATTRIBUTE_Name);
+  WideStringView wsName = GetCData(XFA_ATTRIBUTE_Name);
   CXFA_Node* pInstanceMgr = nullptr;
   for (CXFA_Node* pNode = GetNodeItem(XFA_NODEITEM_PrevSibling); pNode;
        pNode = pNode->GetNodeItem(XFA_NODEITEM_PrevSibling)) {
     if (pNode->GetElementType() == XFA_Element::InstanceManager) {
-      CFX_WideStringC wsInstMgrName = pNode->GetCData(XFA_ATTRIBUTE_Name);
+      WideStringView wsInstMgrName = pNode->GetCData(XFA_ATTRIBUTE_Name);
       if (wsInstMgrName.GetLength() >= 1 && wsInstMgrName[0] == '_' &&
           wsInstMgrName.Right(wsInstMgrName.GetLength() - 1) == wsName) {
         pInstanceMgr = pNode;
@@ -2753,9 +2749,9 @@ void CXFA_Node::Script_Subform_Locale(CFXJSE_Value* pValue,
   if (bSetting) {
     SetCData(XFA_ATTRIBUTE_Locale, pValue->ToWideString(), true, true);
   } else {
-    CFX_WideString wsLocaleName;
+    WideString wsLocaleName;
     GetLocaleName(wsLocaleName);
-    pValue->SetString(wsLocaleName.UTF8Encode().AsStringC());
+    pValue->SetString(wsLocaleName.UTF8Encode().AsStringView());
   }
 }
 
@@ -2765,9 +2761,9 @@ void CXFA_Node::Script_Subform_ExecEvent(CFXJSE_Arguments* pArguments) {
     return;
   }
 
-  CFX_ByteString eventString = pArguments->GetUTF8String(0);
+  ByteString eventString = pArguments->GetUTF8String(0);
   execSingleEventByName(
-      CFX_WideString::FromUTF8(eventString.AsStringC()).AsStringC(),
+      WideString::FromUTF8(eventString.AsStringView()).AsStringView(),
       XFA_Element::Subform);
 }
 
@@ -2870,20 +2866,20 @@ void CXFA_Node::Script_Template_CreateNode(CFXJSE_Arguments* pArguments) {
     return;
   }
 
-  CFX_WideString strName;
-  CFX_WideString strNameSpace;
-  CFX_ByteString bsTagName = pArguments->GetUTF8String(0);
-  CFX_WideString strTagName = CFX_WideString::FromUTF8(bsTagName.AsStringC());
+  WideString strName;
+  WideString strNameSpace;
+  ByteString bsTagName = pArguments->GetUTF8String(0);
+  WideString strTagName = WideString::FromUTF8(bsTagName.AsStringView());
   if (argc > 1) {
-    CFX_ByteString bsName = pArguments->GetUTF8String(1);
-    strName = CFX_WideString::FromUTF8(bsName.AsStringC());
+    ByteString bsName = pArguments->GetUTF8String(1);
+    strName = WideString::FromUTF8(bsName.AsStringView());
     if (argc == 3) {
-      CFX_ByteString bsNameSpace = pArguments->GetUTF8String(2);
-      strNameSpace = CFX_WideString::FromUTF8(bsNameSpace.AsStringC());
+      ByteString bsNameSpace = pArguments->GetUTF8String(2);
+      strNameSpace = WideString::FromUTF8(bsNameSpace.AsStringView());
     }
   }
 
-  XFA_Element eType = XFA_GetElementTypeForName(strTagName.AsStringC());
+  XFA_Element eType = XFA_GetElementTypeForName(strTagName.AsStringView());
   CXFA_Node* pNewNode = CreateSamePacketNode(eType);
   if (!pNewNode) {
     pArguments->GetReturnValue()->SetNull();
@@ -2902,7 +2898,7 @@ void CXFA_Node::Script_Template_CreateNode(CFXJSE_Arguments* pArguments) {
     return;
   }
 
-  pNewNode->SetAttribute(XFA_ATTRIBUTE_Name, strName.AsStringC(), true);
+  pNewNode->SetAttribute(XFA_ATTRIBUTE_Name, strName.AsStringView(), true);
   if (pNewNode->GetPacketID() == XFA_XDPPACKET_Datasets)
     pNewNode->CreateXMLMappingNode();
 
@@ -3156,13 +3152,13 @@ int32_t CXFA_Node::InstanceManager_SetInstances(int32_t iDesired) {
     return 0;
   }
   if (iDesired < iCount) {
-    CFX_WideStringC wsInstManagerName = GetCData(XFA_ATTRIBUTE_Name);
-    CFX_WideString wsInstanceName = CFX_WideString(
+    WideStringView wsInstManagerName = GetCData(XFA_ATTRIBUTE_Name);
+    WideString wsInstanceName = WideString(
         wsInstManagerName.IsEmpty()
             ? wsInstManagerName
             : wsInstManagerName.Right(wsInstManagerName.GetLength() - 1));
     uint32_t dInstanceNameHash =
-        FX_HashCode_GetW(wsInstanceName.AsStringC(), false);
+        FX_HashCode_GetW(wsInstanceName.AsStringView(), false);
     CXFA_Node* pPrevSibling =
         (iDesired == 0) ? this : GetItem(this, iDesired - 1);
     while (iCount > iDesired) {
@@ -3352,12 +3348,12 @@ void CXFA_Node::Script_Form_Checksum(CFXJSE_Value* pValue,
                                      bool bSetting,
                                      XFA_ATTRIBUTE eAttribute) {
   if (bSetting) {
-    SetAttribute(XFA_ATTRIBUTE_Checksum, pValue->ToWideString().AsStringC());
+    SetAttribute(XFA_ATTRIBUTE_Checksum, pValue->ToWideString().AsStringView());
     return;
   }
-  CFX_WideString wsChecksum;
+  WideString wsChecksum;
   GetAttribute(XFA_ATTRIBUTE_Checksum, wsChecksum, false);
-  pValue->SetString(wsChecksum.UTF8Encode().AsStringC());
+  pValue->SetString(wsChecksum.UTF8Encode().AsStringView());
 }
 
 void CXFA_Node::Script_Packet_GetAttribute(CFXJSE_Arguments* pArguments) {
@@ -3365,15 +3361,15 @@ void CXFA_Node::Script_Packet_GetAttribute(CFXJSE_Arguments* pArguments) {
     ThrowParamCountMismatchException(L"getAttribute");
     return;
   }
-  CFX_ByteString bsAttributeName = pArguments->GetUTF8String(0);
-  CFX_WideString wsAttributeValue;
+  ByteString bsAttributeName = pArguments->GetUTF8String(0);
+  WideString wsAttributeValue;
   CFX_XMLNode* pXMLNode = GetXMLMappingNode();
   if (pXMLNode && pXMLNode->GetType() == FX_XMLNODE_Element) {
     wsAttributeValue = static_cast<CFX_XMLElement*>(pXMLNode)->GetString(
-        CFX_WideString::FromUTF8(bsAttributeName.AsStringC()).c_str());
+        WideString::FromUTF8(bsAttributeName.AsStringView()).c_str());
   }
   pArguments->GetReturnValue()->SetString(
-      wsAttributeValue.UTF8Encode().AsStringC());
+      wsAttributeValue.UTF8Encode().AsStringView());
 }
 
 void CXFA_Node::Script_Packet_SetAttribute(CFXJSE_Arguments* pArguments) {
@@ -3381,13 +3377,13 @@ void CXFA_Node::Script_Packet_SetAttribute(CFXJSE_Arguments* pArguments) {
     ThrowParamCountMismatchException(L"setAttribute");
     return;
   }
-  CFX_ByteString bsValue = pArguments->GetUTF8String(0);
-  CFX_ByteString bsName = pArguments->GetUTF8String(1);
+  ByteString bsValue = pArguments->GetUTF8String(0);
+  ByteString bsName = pArguments->GetUTF8String(1);
   CFX_XMLNode* pXMLNode = GetXMLMappingNode();
   if (pXMLNode && pXMLNode->GetType() == FX_XMLNODE_Element) {
     static_cast<CFX_XMLElement*>(pXMLNode)->SetString(
-        CFX_WideString::FromUTF8(bsName.AsStringC()),
-        CFX_WideString::FromUTF8(bsValue.AsStringC()));
+        WideString::FromUTF8(bsName.AsStringView()),
+        WideString::FromUTF8(bsValue.AsStringView()));
   }
   pArguments->GetReturnValue()->SetNull();
 }
@@ -3398,8 +3394,8 @@ void CXFA_Node::Script_Packet_RemoveAttribute(CFXJSE_Arguments* pArguments) {
     return;
   }
 
-  CFX_ByteString bsName = pArguments->GetUTF8String(0);
-  CFX_WideString wsName = CFX_WideString::FromUTF8(bsName.AsStringC());
+  ByteString bsName = pArguments->GetUTF8String(0);
+  WideString wsName = WideString::FromUTF8(bsName.AsStringView());
   CFX_XMLNode* pXMLNode = GetXMLMappingNode();
   if (pXMLNode && pXMLNode->GetType() == FX_XMLNODE_Element) {
     CFX_XMLElement* pXMLElement = static_cast<CFX_XMLElement*>(pXMLNode);
@@ -3420,13 +3416,13 @@ void CXFA_Node::Script_Packet_Content(CFXJSE_Value* pValue,
       pXMLElement->SetTextData(pValue->ToWideString());
     }
   } else {
-    CFX_WideString wsTextData;
+    WideString wsTextData;
     CFX_XMLNode* pXMLNode = GetXMLMappingNode();
     if (pXMLNode && pXMLNode->GetType() == FX_XMLNODE_Element) {
       CFX_XMLElement* pXMLElement = static_cast<CFX_XMLElement*>(pXMLNode);
       wsTextData = pXMLElement->GetTextData();
     }
-    pValue->SetString(wsTextData.UTF8Encode().AsStringC());
+    pValue->SetString(wsTextData.UTF8Encode().AsStringView());
   }
 }
 
@@ -3548,7 +3544,7 @@ void CXFA_Node::Script_Script_Stateless(CFXJSE_Value* pValue,
     ThrowInvalidPropertyException();
     return;
   }
-  pValue->SetString(FX_UTF8Encode(CFX_WideStringC(L"0", 1)).AsStringC());
+  pValue->SetString(FX_UTF8Encode(WideStringView(L"0", 1)).AsStringView());
 }
 
 void CXFA_Node::Script_Encrypt_Format(CFXJSE_Value* pValue,
@@ -3561,7 +3557,7 @@ bool CXFA_Node::HasAttribute(XFA_ATTRIBUTE eAttr, bool bCanInherit) {
 }
 
 bool CXFA_Node::SetAttribute(XFA_ATTRIBUTE eAttr,
-                             const CFX_WideStringC& wsValue,
+                             const WideStringView& wsValue,
                              bool bNotify) {
   const XFA_ATTRIBUTEINFO* pAttr = XFA_GetAttributeByID(eAttr);
   if (!pAttr)
@@ -3582,7 +3578,7 @@ bool CXFA_Node::SetAttribute(XFA_ATTRIBUTE eAttr,
                      bNotify);
     } break;
     case XFA_ATTRIBUTETYPE_Cdata:
-      return SetCData(pAttr->eName, CFX_WideString(wsValue), bNotify);
+      return SetCData(pAttr->eName, WideString(wsValue), bNotify);
     case XFA_ATTRIBUTETYPE_Boolean:
       return SetBoolean(pAttr->eName, wsValue != L"0", bNotify);
     case XFA_ATTRIBUTETYPE_Integer:
@@ -3599,7 +3595,7 @@ bool CXFA_Node::SetAttribute(XFA_ATTRIBUTE eAttr,
 }
 
 bool CXFA_Node::GetAttribute(XFA_ATTRIBUTE eAttr,
-                             CFX_WideString& wsValue,
+                             WideString& wsValue,
                              bool bUseDefault) {
   const XFA_ATTRIBUTEINFO* pAttr = XFA_GetAttributeByID(eAttr);
   if (!pAttr)
@@ -3621,7 +3617,7 @@ bool CXFA_Node::GetAttribute(XFA_ATTRIBUTE eAttr,
       return true;
     }
     case XFA_ATTRIBUTETYPE_Cdata: {
-      CFX_WideStringC wsValueC;
+      WideStringView wsValueC;
       if (!TryCData(pAttr->eName, wsValueC, bUseDefault))
         return false;
 
@@ -3657,8 +3653,8 @@ bool CXFA_Node::GetAttribute(XFA_ATTRIBUTE eAttr,
   }
 }
 
-bool CXFA_Node::SetAttribute(const CFX_WideStringC& wsAttr,
-                             const CFX_WideStringC& wsValue,
+bool CXFA_Node::SetAttribute(const WideStringView& wsAttr,
+                             const WideStringView& wsValue,
                              bool bNotify) {
   const XFA_ATTRIBUTEINFO* pAttributeInfo = XFA_GetAttributeByName(wsValue);
   if (pAttributeInfo) {
@@ -3669,22 +3665,22 @@ bool CXFA_Node::SetAttribute(const CFX_WideStringC& wsAttr,
   return true;
 }
 
-bool CXFA_Node::GetAttribute(const CFX_WideStringC& wsAttr,
-                             CFX_WideString& wsValue,
+bool CXFA_Node::GetAttribute(const WideStringView& wsAttr,
+                             WideString& wsValue,
                              bool bUseDefault) {
   const XFA_ATTRIBUTEINFO* pAttributeInfo = XFA_GetAttributeByName(wsAttr);
   if (pAttributeInfo) {
     return GetAttribute(pAttributeInfo->eName, wsValue, bUseDefault);
   }
   void* pKey = GetMapKey_Custom(wsAttr);
-  CFX_WideStringC wsValueC;
+  WideStringView wsValueC;
   if (GetMapModuleString(pKey, wsValueC)) {
     wsValue = wsValueC;
   }
   return true;
 }
 
-bool CXFA_Node::RemoveAttribute(const CFX_WideStringC& wsAttr) {
+bool CXFA_Node::RemoveAttribute(const WideStringView& wsAttr) {
   void* pKey = GetMapKey_Custom(wsAttr);
   RemoveMapModuleKey(pKey);
   return true;
@@ -3755,16 +3751,16 @@ CXFA_Measurement CXFA_Node::GetMeasure(XFA_ATTRIBUTE eAttr) const {
 }
 
 bool CXFA_Node::SetCData(XFA_ATTRIBUTE eAttr,
-                         const CFX_WideString& wsValue,
+                         const WideString& wsValue,
                          bool bNotify,
                          bool bScriptModify) {
   void* pKey = GetMapKey_Element(GetElementType(), eAttr);
   OnChanging(eAttr, bNotify);
   if (eAttr == XFA_ATTRIBUTE_Value) {
-    CFX_WideString* pClone = new CFX_WideString(wsValue);
+    WideString* pClone = new WideString(wsValue);
     SetUserData(pKey, pClone, &deleteWideStringCallBack);
   } else {
-    SetMapModuleString(pKey, wsValue.AsStringC());
+    SetMapModuleString(pKey, wsValue.AsStringView());
     if (eAttr == XFA_ATTRIBUTE_Name)
       UpdateNameHash();
   }
@@ -3787,7 +3783,7 @@ bool CXFA_Node::SetCData(XFA_ATTRIBUTE eAttr,
       case FX_XMLNODE_Element:
         if (IsAttributeInXML()) {
           static_cast<CFX_XMLElement*>(m_pXMLNode)
-              ->SetString(CFX_WideString(GetCData(XFA_ATTRIBUTE_QualifiedName)),
+              ->SetString(WideString(GetCData(XFA_ATTRIBUTE_QualifiedName)),
                           wsValue);
         } else {
           bool bDeleteChildren = true;
@@ -3820,7 +3816,7 @@ bool CXFA_Node::SetCData(XFA_ATTRIBUTE eAttr,
   const XFA_ATTRIBUTEINFO* pInfo = XFA_GetAttributeByID(eAttr);
   if (pInfo) {
     ASSERT(m_pXMLNode->GetType() == FX_XMLNODE_Element);
-    CFX_WideString wsAttrName = pInfo->pName;
+    WideString wsAttrName = pInfo->pName;
     if (pInfo->eName == XFA_ATTRIBUTE_ContentType) {
       wsAttrName = L"xfa:" + wsAttrName;
     }
@@ -3829,13 +3825,13 @@ bool CXFA_Node::SetCData(XFA_ATTRIBUTE eAttr,
   return true;
 }
 
-bool CXFA_Node::SetAttributeValue(const CFX_WideString& wsValue,
-                                  const CFX_WideString& wsXMLValue,
+bool CXFA_Node::SetAttributeValue(const WideString& wsValue,
+                                  const WideString& wsXMLValue,
                                   bool bNotify,
                                   bool bScriptModify) {
   void* pKey = GetMapKey_Element(GetElementType(), XFA_ATTRIBUTE_Value);
   OnChanging(XFA_ATTRIBUTE_Value, bNotify);
-  CFX_WideString* pClone = new CFX_WideString(wsValue);
+  WideString* pClone = new WideString(wsValue);
   SetUserData(pKey, pClone, &deleteWideStringCallBack);
   OnChanged(XFA_ATTRIBUTE_Value, bNotify, bScriptModify);
   if (IsNeedSavingXMLNode()) {
@@ -3844,7 +3840,7 @@ bool CXFA_Node::SetAttributeValue(const CFX_WideString& wsValue,
       case FX_XMLNODE_Element:
         if (IsAttributeInXML()) {
           static_cast<CFX_XMLElement*>(m_pXMLNode)
-              ->SetString(CFX_WideString(GetCData(XFA_ATTRIBUTE_QualifiedName)),
+              ->SetString(WideString(GetCData(XFA_ATTRIBUTE_QualifiedName)),
                           wsXMLValue);
         } else {
           bool bDeleteChildren = true;
@@ -3876,18 +3872,18 @@ bool CXFA_Node::SetAttributeValue(const CFX_WideString& wsValue,
 }
 
 bool CXFA_Node::TryCData(XFA_ATTRIBUTE eAttr,
-                         CFX_WideString& wsValue,
+                         WideString& wsValue,
                          bool bUseDefault,
                          bool bProto) {
   void* pKey = GetMapKey_Element(GetElementType(), eAttr);
   if (eAttr == XFA_ATTRIBUTE_Value) {
-    CFX_WideString* pStr = (CFX_WideString*)GetUserData(pKey, bProto);
+    WideString* pStr = (WideString*)GetUserData(pKey, bProto);
     if (pStr) {
       wsValue = *pStr;
       return true;
     }
   } else {
-    CFX_WideStringC wsValueC;
+    WideStringView wsValueC;
     if (GetMapModuleString(pKey, wsValueC)) {
       wsValue = wsValueC;
       return true;
@@ -3906,14 +3902,14 @@ bool CXFA_Node::TryCData(XFA_ATTRIBUTE eAttr,
 }
 
 bool CXFA_Node::TryCData(XFA_ATTRIBUTE eAttr,
-                         CFX_WideStringC& wsValue,
+                         WideStringView& wsValue,
                          bool bUseDefault,
                          bool bProto) {
   void* pKey = GetMapKey_Element(GetElementType(), eAttr);
   if (eAttr == XFA_ATTRIBUTE_Value) {
-    CFX_WideString* pStr = (CFX_WideString*)GetUserData(pKey, bProto);
+    WideString* pStr = (WideString*)GetUserData(pKey, bProto);
     if (pStr) {
-      wsValue = pStr->AsStringC();
+      wsValue = pStr->AsStringView();
       return true;
     }
   } else {
@@ -3927,7 +3923,7 @@ bool CXFA_Node::TryCData(XFA_ATTRIBUTE eAttr,
   void* pValue = nullptr;
   if (XFA_GetAttributeDefaultValue(pValue, GetElementType(), eAttr,
                                    XFA_ATTRIBUTETYPE_Cdata, m_ePacket)) {
-    wsValue = (CFX_WideStringC)(const wchar_t*)pValue;
+    wsValue = (WideStringView)(const wchar_t*)pValue;
     return true;
   }
   return false;
@@ -3971,7 +3967,7 @@ bool CXFA_Node::SetValue(XFA_ATTRIBUTE eAttr,
               ->SetString(pInfo->pName, pValue ? L"1" : L"0");
           break;
         case XFA_ATTRIBUTETYPE_Integer: {
-          CFX_WideString wsValue;
+          WideString wsValue;
           wsValue.Format(
               L"%d", static_cast<int32_t>(reinterpret_cast<uintptr_t>(pValue)));
           static_cast<CFX_XMLElement*>(m_pXMLNode)
@@ -4017,8 +4013,8 @@ bool CXFA_Node::TryUserData(void* pKey, void*& pData, bool bProtoAlso) {
   return iBytes == sizeof(void*) && memcpy(&pData, pData, iBytes);
 }
 
-bool CXFA_Node::SetScriptContent(const CFX_WideString& wsContent,
-                                 const CFX_WideString& wsXMLValue,
+bool CXFA_Node::SetScriptContent(const WideString& wsContent,
+                                 const WideString& wsXMLValue,
                                  bool bNotify,
                                  bool bScriptModify,
                                  bool bSyncData) {
@@ -4038,7 +4034,7 @@ bool CXFA_Node::SetScriptContent(const CFX_WideString& wsContent,
                                       bScriptModify, false);
         CXFA_Node* pBind = GetBindData();
         if (bSyncData && pBind) {
-          std::vector<CFX_WideString> wsSaveTextArray;
+          std::vector<WideString> wsSaveTextArray;
           size_t iSize = 0;
           if (!wsContent.IsEmpty()) {
             FX_STRSIZE iStart = 0;
@@ -4132,12 +4128,12 @@ bool CXFA_Node::SetScriptContent(const CFX_WideString& wsContent,
       break;
     }
     case XFA_ObjectType::ContentNode: {
-      CFX_WideString wsContentType;
+      WideString wsContentType;
       if (GetElementType() == XFA_Element::ExData) {
         GetAttribute(XFA_ATTRIBUTE_ContentType, wsContentType, false);
         if (wsContentType == L"text/html") {
           wsContentType = L"";
-          SetAttribute(XFA_ATTRIBUTE_ContentType, wsContentType.AsStringC());
+          SetAttribute(XFA_ATTRIBUTE_ContentType, wsContentType.AsStringView());
         }
       }
       CXFA_Node* pContentRawDataNode = GetNodeItem(XFA_NODEITEM_FirstChild);
@@ -4193,8 +4189,8 @@ bool CXFA_Node::SetScriptContent(const CFX_WideString& wsContent,
   return true;
 }
 
-bool CXFA_Node::SetContent(const CFX_WideString& wsContent,
-                           const CFX_WideString& wsXMLValue,
+bool CXFA_Node::SetContent(const WideString& wsContent,
+                           const WideString& wsXMLValue,
                            bool bNotify,
                            bool bScriptModify,
                            bool bSyncData) {
@@ -4202,16 +4198,16 @@ bool CXFA_Node::SetContent(const CFX_WideString& wsContent,
                           bSyncData);
 }
 
-CFX_WideString CXFA_Node::GetScriptContent(bool bScriptModify) {
-  CFX_WideString wsContent;
-  return TryContent(wsContent, bScriptModify) ? wsContent : CFX_WideString();
+WideString CXFA_Node::GetScriptContent(bool bScriptModify) {
+  WideString wsContent;
+  return TryContent(wsContent, bScriptModify) ? wsContent : WideString();
 }
 
-CFX_WideString CXFA_Node::GetContent() {
+WideString CXFA_Node::GetContent() {
   return GetScriptContent();
 }
 
-bool CXFA_Node::TryContent(CFX_WideString& wsContent,
+bool CXFA_Node::TryContent(WideString& wsContent,
                            bool bScriptModify,
                            bool bProto) {
   CXFA_Node* pNode = nullptr;
@@ -4238,7 +4234,7 @@ bool CXFA_Node::TryContent(CFX_WideString& wsContent,
       if (!pContentRawDataNode) {
         XFA_Element element = XFA_Element::Sharptext;
         if (GetElementType() == XFA_Element::ExData) {
-          CFX_WideString wsContentType;
+          WideString wsContentType;
           GetAttribute(XFA_ATTRIBUTE_ContentType, wsContentType, false);
           if (wsContentType == L"text/html") {
             element = XFA_Element::SharpxHTML;
@@ -4298,7 +4294,7 @@ CXFA_Node* CXFA_Node::GetModelNode() {
   }
 }
 
-bool CXFA_Node::TryNamespace(CFX_WideString& wsNamespace) {
+bool CXFA_Node::TryNamespace(WideString& wsNamespace) {
   wsNamespace.clear();
   if (IsModelNode() || GetElementType() == XFA_Element::Packet) {
     CFX_XMLNode* pXMLNode = GetXMLMappingNode();
@@ -4554,17 +4550,17 @@ bool CXFA_Node::RemoveChild(CXFA_Node* pNode, bool bNotify) {
       if (pNode->m_pXMLNode->GetType() == FX_XMLNODE_Element) {
         CFX_XMLElement* pXMLElement =
             static_cast<CFX_XMLElement*>(pNode->m_pXMLNode);
-        CFX_WideStringC wsAttributeName =
+        WideStringView wsAttributeName =
             pNode->GetCData(XFA_ATTRIBUTE_QualifiedName);
         // TODO(tsepez): check usage of c_str() below.
         pXMLElement->RemoveAttribute(wsAttributeName.unterminated_c_str());
       }
-      CFX_WideString wsName;
+      WideString wsName;
       pNode->GetAttribute(XFA_ATTRIBUTE_Name, wsName, false);
       CFX_XMLElement* pNewXMLElement = new CFX_XMLElement(wsName);
-      CFX_WideStringC wsValue = GetCData(XFA_ATTRIBUTE_Value);
+      WideStringView wsValue = GetCData(XFA_ATTRIBUTE_Value);
       if (!wsValue.IsEmpty()) {
-        pNewXMLElement->SetTextData(CFX_WideString(wsValue));
+        pNewXMLElement->SetTextData(WideString(wsValue));
       }
       pNode->m_pXMLNode = pNewXMLElement;
       pNode->SetEnum(XFA_ATTRIBUTE_Contains, XFA_ATTRIBUTEENUM_Unknown);
@@ -4576,7 +4572,7 @@ bool CXFA_Node::RemoveChild(CXFA_Node* pNode, bool bNotify) {
   return true;
 }
 
-CXFA_Node* CXFA_Node::GetFirstChildByName(const CFX_WideStringC& wsName) const {
+CXFA_Node* CXFA_Node::GetFirstChildByName(const WideStringView& wsName) const {
   return GetFirstChildByName(FX_HashCode_GetW(wsName, false));
 }
 
@@ -4611,7 +4607,7 @@ CXFA_Node* CXFA_Node::GetNextSameNameSibling(uint32_t dwNameHash) const {
 }
 
 CXFA_Node* CXFA_Node::GetNextSameNameSibling(
-    const CFX_WideStringC& wsNodeName) const {
+    const WideStringView& wsNodeName) const {
   return GetNextSameNameSibling(FX_HashCode_GetW(wsNodeName, false));
 }
 
@@ -4641,7 +4637,7 @@ int32_t CXFA_Node::GetNodeSameClassIndex() const {
   return pScriptContext->GetIndexByClassName(const_cast<CXFA_Node*>(this));
 }
 
-void CXFA_Node::GetSOMExpression(CFX_WideString& wsSOMExpression) {
+void CXFA_Node::GetSOMExpression(WideString& wsSOMExpression) {
   CXFA_ScriptContext* pScriptContext = m_pDocument->GetScriptContext();
   if (!pScriptContext) {
     return;
@@ -4664,8 +4660,8 @@ CXFA_Node* CXFA_Node::GetInstanceMgrOfSubform() {
         break;
       }
       if (eType == XFA_Element::InstanceManager) {
-        CFX_WideStringC wsName = GetCData(XFA_ATTRIBUTE_Name);
-        CFX_WideStringC wsInstName = pNode->GetCData(XFA_ATTRIBUTE_Name);
+        WideStringView wsName = GetCData(XFA_ATTRIBUTE_Name);
+        WideStringView wsInstName = pNode->GetCData(XFA_ATTRIBUTE_Name);
         if (wsInstName.GetLength() > 0 && wsInstName[0] == '_' &&
             wsInstName.Right(wsInstName.GetLength() - 1) == wsName) {
           pInstanceMgr = pNode;
@@ -4733,7 +4729,7 @@ void CXFA_Node::OnChanged(XFA_ATTRIBUTE eAttr,
   }
 }
 
-int32_t CXFA_Node::execSingleEventByName(const CFX_WideStringC& wsEventName,
+int32_t CXFA_Node::execSingleEventByName(const WideStringView& wsEventName,
                                          XFA_Element eType) {
   int32_t iRet = XFA_EVENTERROR_NotExist;
   const XFA_ExecEventParaInfo* eventParaInfo =
@@ -4797,7 +4793,7 @@ int32_t CXFA_Node::execSingleEventByName(const CFX_WideStringC& wsEventName,
 void CXFA_Node::UpdateNameHash() {
   const XFA_NOTSUREATTRIBUTE* pNotsure =
       XFA_GetNotsureAttribute(GetElementType(), XFA_ATTRIBUTE_Name);
-  CFX_WideStringC wsName;
+  WideStringView wsName;
   if (!pNotsure || pNotsure->eType == XFA_ATTRIBUTETYPE_Cdata) {
     wsName = GetCData(XFA_ATTRIBUTE_Name);
     m_dwNameHash = FX_HashCode_GetW(wsName, false);
@@ -4809,7 +4805,7 @@ void CXFA_Node::UpdateNameHash() {
 
 CFX_XMLNode* CXFA_Node::CreateXMLMappingNode() {
   if (!m_pXMLNode) {
-    CFX_WideString wsTag(GetCData(XFA_ATTRIBUTE_Name));
+    WideString wsTag(GetCData(XFA_ATTRIBUTE_Name));
     m_pXMLNode = new CFX_XMLElement(wsTag);
     SetFlag(XFA_NodeFlag_OwnXMLNode, false);
   }
@@ -4852,19 +4848,19 @@ bool CXFA_Node::GetMapModuleValue(void* pKey, void*& pValue) {
   return false;
 }
 
-void CXFA_Node::SetMapModuleString(void* pKey, const CFX_WideStringC& wsValue) {
+void CXFA_Node::SetMapModuleString(void* pKey, const WideStringView& wsValue) {
   SetMapModuleBuffer(pKey, (void*)wsValue.unterminated_c_str(),
                      wsValue.GetLength() * sizeof(wchar_t));
 }
 
-bool CXFA_Node::GetMapModuleString(void* pKey, CFX_WideStringC& wsValue) {
+bool CXFA_Node::GetMapModuleString(void* pKey, WideStringView& wsValue) {
   void* pValue;
   int32_t iBytes;
   if (!GetMapModuleBuffer(pKey, pValue, iBytes))
     return false;
   // Defensive measure: no out-of-bounds pointers even if zero length.
   int32_t iChars = iBytes / sizeof(wchar_t);
-  wsValue = CFX_WideStringC(iChars ? (const wchar_t*)pValue : nullptr, iChars);
+  wsValue = WideStringView(iChars ? (const wchar_t*)pValue : nullptr, iChars);
   return true;
 }
 
@@ -5047,8 +5043,8 @@ void CXFA_Node::MoveBufferMapData(CXFA_Node* pDstModule, void* pKey) {
     }
   }
   if (pDstModule->IsNodeV()) {
-    CFX_WideString wsValue = pDstModule->GetScriptContent(false);
-    CFX_WideString wsFormatValue(wsValue);
+    WideString wsValue = pDstModule->GetScriptContent(false);
+    WideString wsFormatValue(wsValue);
     CXFA_WidgetData* pWidgetData = pDstModule->GetContainerWidgetData();
     if (pWidgetData) {
       pWidgetData->GetFormatDataValue(wsValue, wsFormatValue);
@@ -5076,15 +5072,13 @@ void CXFA_Node::MoveBufferMapData(CXFA_Node* pSrcModule,
   pSrcModule->MoveBufferMapData(pDstModule, pKey);
 }
 
-void CXFA_Node::ThrowMissingPropertyException(
-    const CFX_WideString& obj,
-    const CFX_WideString& prop) const {
+void CXFA_Node::ThrowMissingPropertyException(const WideString& obj,
+                                              const WideString& prop) const {
   ThrowException(L"'%s' doesn't have property '%s'.", obj.c_str(),
                  prop.c_str());
 }
 
-void CXFA_Node::ThrowTooManyOccurancesException(
-    const CFX_WideString& obj) const {
+void CXFA_Node::ThrowTooManyOccurancesException(const WideString& obj) const {
   ThrowException(
       L"The element [%s] has violated its allowable number of occurrences.",
       obj.c_str());
diff --git a/xfa/fxfa/parser/cxfa_node.h b/xfa/fxfa/parser/cxfa_node.h
index db4b2ce553..7faed0e38f 100644
--- a/xfa/fxfa/parser/cxfa_node.h
+++ b/xfa/fxfa/parser/cxfa_node.h
@@ -105,29 +105,29 @@ class CXFA_Node : public CXFA_Object {
   void UpdateNameHash();
   bool HasAttribute(XFA_ATTRIBUTE eAttr, bool bCanInherit = false);
   bool SetAttribute(XFA_ATTRIBUTE eAttr,
-                    const CFX_WideStringC& wsValue,
+                    const WideStringView& wsValue,
                     bool bNotify = false);
   bool GetAttribute(XFA_ATTRIBUTE eAttr,
-                    CFX_WideString& wsValue,
+                    WideString& wsValue,
                     bool bUseDefault = true);
-  bool SetAttribute(const CFX_WideStringC& wsAttr,
-                    const CFX_WideStringC& wsValue,
+  bool SetAttribute(const WideStringView& wsAttr,
+                    const WideStringView& wsValue,
                     bool bNotify = false);
-  bool GetAttribute(const CFX_WideStringC& wsAttr,
-                    CFX_WideString& wsValue,
+  bool GetAttribute(const WideStringView& wsAttr,
+                    WideString& wsValue,
                     bool bUseDefault = true);
-  bool RemoveAttribute(const CFX_WideStringC& wsAttr);
-  bool SetContent(const CFX_WideString& wsContent,
-                  const CFX_WideString& wsXMLValue,
+  bool RemoveAttribute(const WideStringView& wsAttr);
+  bool SetContent(const WideString& wsContent,
+                  const WideString& wsXMLValue,
                   bool bNotify = false,
                   bool bScriptModify = false,
                   bool bSyncData = true);
-  bool TryContent(CFX_WideString& wsContent,
+  bool TryContent(WideString& wsContent,
                   bool bScriptModify = false,
                   bool bProto = true);
-  CFX_WideString GetContent();
+  WideString GetContent();
 
-  bool TryNamespace(CFX_WideString& wsNamespace);
+  bool TryNamespace(WideString& wsNamespace);
 
   bool SetBoolean(XFA_ATTRIBUTE eAttr, bool bValue, bool bNotify = false) {
     return SetValue(eAttr, XFA_ATTRIBUTETYPE_Boolean, (void*)(uintptr_t)bValue,
@@ -163,24 +163,24 @@ class CXFA_Node : public CXFA_Object {
     return TryEnum(eAttr, eValue, true) ? eValue : XFA_ATTRIBUTEENUM_Unknown;
   }
   bool SetCData(XFA_ATTRIBUTE eAttr,
-                const CFX_WideString& wsValue,
+                const WideString& wsValue,
                 bool bNotify = false,
                 bool bScriptModify = false);
-  bool SetAttributeValue(const CFX_WideString& wsValue,
-                         const CFX_WideString& wsXMLValue,
+  bool SetAttributeValue(const WideString& wsValue,
+                         const WideString& wsXMLValue,
                          bool bNotify = false,
                          bool bScriptModify = false);
   bool TryCData(XFA_ATTRIBUTE eAttr,
-                CFX_WideString& wsValue,
+                WideString& wsValue,
                 bool bUseDefault = true,
                 bool bProto = true);
   bool TryCData(XFA_ATTRIBUTE eAttr,
-                CFX_WideStringC& wsValue,
+                WideStringView& wsValue,
                 bool bUseDefault = true,
                 bool bProto = true);
-  CFX_WideStringC GetCData(XFA_ATTRIBUTE eAttr) {
-    CFX_WideStringC wsValue;
-    return TryCData(eAttr, wsValue) ? wsValue : CFX_WideStringC();
+  WideStringView GetCData(XFA_ATTRIBUTE eAttr) {
+    WideStringView wsValue;
+    return TryCData(eAttr, wsValue) ? wsValue : WideStringView();
   }
   bool SetMeasure(XFA_ATTRIBUTE eAttr,
                   CXFA_Measurement mValue,
@@ -236,24 +236,24 @@ class CXFA_Node : public CXFA_Object {
   bool HasBindItem();
   CXFA_WidgetData* GetWidgetData();
   CXFA_WidgetData* GetContainerWidgetData();
-  bool GetLocaleName(CFX_WideString& wsLocaleName);
+  bool GetLocaleName(WideString& wsLocaleName);
   XFA_ATTRIBUTEENUM GetIntact();
-  CXFA_Node* GetFirstChildByName(const CFX_WideStringC& wsNodeName) const;
+  CXFA_Node* GetFirstChildByName(const WideStringView& wsNodeName) const;
   CXFA_Node* GetFirstChildByName(uint32_t dwNodeNameHash) const;
   CXFA_Node* GetFirstChildByClass(XFA_Element eType) const;
   CXFA_Node* GetNextSameNameSibling(uint32_t dwNodeNameHash) const;
-  CXFA_Node* GetNextSameNameSibling(const CFX_WideStringC& wsNodeName) const;
+  CXFA_Node* GetNextSameNameSibling(const WideStringView& wsNodeName) const;
   CXFA_Node* GetNextSameClassSibling(XFA_Element eType) const;
   int32_t GetNodeSameNameIndex() const;
   int32_t GetNodeSameClassIndex() const;
-  void GetSOMExpression(CFX_WideString& wsSOMExpression);
+  void GetSOMExpression(WideString& wsSOMExpression);
   CXFA_Node* GetInstanceMgrOfSubform();
 
   CXFA_Node* GetOccurNode();
   void Script_TreeClass_ResolveNode(CFXJSE_Arguments* pArguments);
   void Script_TreeClass_ResolveNodes(CFXJSE_Arguments* pArguments);
   void Script_Som_ResolveNodeList(CFXJSE_Value* pValue,
-                                  CFX_WideString wsExpression,
+                                  WideString wsExpression,
                                   uint32_t dwFlag,
                                   CXFA_Node* refNode = nullptr);
   void Script_TreeClass_All(CFXJSE_Value* pValue,
@@ -540,7 +540,7 @@ class CXFA_Node : public CXFA_Object {
             uint16_t ePacket,
             XFA_ObjectType oType,
             XFA_Element eType,
-            const CFX_WideStringC& elementName);
+            const WideStringView& elementName);
   ~CXFA_Node() override;
 
   bool HasFlag(XFA_NodeFlag dwFlag) const;
@@ -556,20 +556,20 @@ class CXFA_Node : public CXFA_Object {
   void OnRemoved(bool bNotify);
   void OnChanging(XFA_ATTRIBUTE eAttr, bool bNotify);
   void OnChanged(XFA_ATTRIBUTE eAttr, bool bNotify, bool bScriptModify);
-  int32_t execSingleEventByName(const CFX_WideStringC& wsEventName,
+  int32_t execSingleEventByName(const WideStringView& wsEventName,
                                 XFA_Element eType);
-  bool SetScriptContent(const CFX_WideString& wsContent,
-                        const CFX_WideString& wsXMLValue,
+  bool SetScriptContent(const WideString& wsContent,
+                        const WideString& wsXMLValue,
                         bool bNotify = true,
                         bool bScriptModify = false,
                         bool bSyncData = true);
-  CFX_WideString GetScriptContent(bool bScriptModify = false);
+  WideString GetScriptContent(bool bScriptModify = false);
   XFA_MAPMODULEDATA* CreateMapModuleData();
   XFA_MAPMODULEDATA* GetMapModuleData() const;
   void SetMapModuleValue(void* pKey, void* pValue);
   bool GetMapModuleValue(void* pKey, void*& pValue);
-  void SetMapModuleString(void* pKey, const CFX_WideStringC& wsValue);
-  bool GetMapModuleString(void* pKey, CFX_WideStringC& wsValue);
+  void SetMapModuleString(void* pKey, const WideStringView& wsValue);
+  bool GetMapModuleString(void* pKey, WideStringView& wsValue);
   void SetMapModuleBuffer(
       void* pKey,
       void* pValue,
@@ -600,9 +600,9 @@ class CXFA_Node : public CXFA_Object {
   XFA_MAPMODULEDATA* m_pMapModuleData;
 
  private:
-  void ThrowMissingPropertyException(const CFX_WideString& obj,
-                                     const CFX_WideString& prop) const;
-  void ThrowTooManyOccurancesException(const CFX_WideString& obj) const;
+  void ThrowMissingPropertyException(const WideString& obj,
+                                     const WideString& prop) const;
+  void ThrowTooManyOccurancesException(const WideString& obj) const;
 };
 
 #endif  // XFA_FXFA_PARSER_CXFA_NODE_H_
diff --git a/xfa/fxfa/parser/cxfa_nodehelper.cpp b/xfa/fxfa/parser/cxfa_nodehelper.cpp
index 4f1ed04fe3..bc91c66f77 100644
--- a/xfa/fxfa/parser/cxfa_nodehelper.cpp
+++ b/xfa/fxfa/parser/cxfa_nodehelper.cpp
@@ -31,7 +31,7 @@ CXFA_Node* CXFA_NodeHelper::ResolveNodes_GetOneChild(CXFA_Node* parent,
     return nullptr;
 
   std::vector<CXFA_Node*> siblings;
-  uint32_t uNameHash = FX_HashCode_GetW(CFX_WideStringC(pwsName), false);
+  uint32_t uNameHash = FX_HashCode_GetW(WideStringView(pwsName), false);
   NodeAcc_TraverseAnySiblings(parent, uNameHash, &siblings, bIsClassName);
   return !siblings.empty() ? siblings[0] : nullptr;
 }
@@ -228,13 +228,13 @@ int32_t CXFA_NodeHelper::GetIndex(CXFA_Node* pNode,
 }
 
 void CXFA_NodeHelper::GetNameExpression(CXFA_Node* refNode,
-                                        CFX_WideString& wsName,
+                                        WideString& wsName,
                                         bool bIsAllPath,
                                         XFA_LOGIC_TYPE eLogicType) {
   wsName.clear();
   if (bIsAllPath) {
     GetNameExpression(refNode, wsName, false, eLogicType);
-    CFX_WideString wsParent;
+    WideString wsParent;
     CXFA_Node* parent =
         ResolveNodes_GetParent(refNode, XFA_LOGIC_NoTransparent);
     while (parent) {
@@ -247,7 +247,7 @@ void CXFA_NodeHelper::GetNameExpression(CXFA_Node* refNode,
     return;
   }
 
-  CFX_WideString ws;
+  WideString ws;
   bool bIsProperty = NodeIsProperty(refNode);
   if (refNode->IsUnnamed() ||
       (bIsProperty && refNode->GetElementType() != XFA_Element::PageSet)) {
@@ -275,9 +275,9 @@ bool CXFA_NodeHelper::NodeIsTransparent(CXFA_Node* refNode) {
   return false;
 }
 
-bool CXFA_NodeHelper::CreateNode_ForCondition(CFX_WideString& wsCondition) {
+bool CXFA_NodeHelper::CreateNode_ForCondition(WideString& wsCondition) {
   int32_t iLen = wsCondition.GetLength();
-  CFX_WideString wsIndex(L"0");
+  WideString wsIndex(L"0");
   bool bAll = false;
   if (iLen == 0) {
     m_iCreateFlag = XFA_RESOLVENODE_RSTYPE_CreateNodeOne;
@@ -314,8 +314,8 @@ bool CXFA_NodeHelper::CreateNode_ForCondition(CFX_WideString& wsCondition) {
 }
 
 bool CXFA_NodeHelper::ResolveNodes_CreateNode(
-    CFX_WideString wsName,
-    CFX_WideString wsCondition,
+    WideString wsName,
+    WideString wsCondition,
     bool bLastNode,
     CXFA_ScriptContext* pScriptContext) {
   if (!m_pCreateParent) {
@@ -336,7 +336,7 @@ bool CXFA_NodeHelper::ResolveNodes_CreateNode(
     CreateNode_ForCondition(wsCondition);
   }
   if (bIsClassName) {
-    XFA_Element eType = XFA_GetElementTypeForName(wsName.AsStringC());
+    XFA_Element eType = XFA_GetElementTypeForName(wsName.AsStringView());
     if (eType == XFA_Element::Unknown)
       return false;
 
@@ -358,7 +358,7 @@ bool CXFA_NodeHelper::ResolveNodes_CreateNode(
     for (int32_t iIndex = 0; iIndex < m_iCreateCount; iIndex++) {
       CXFA_Node* pNewNode = m_pCreateParent->CreateSamePacketNode(eClassType);
       if (pNewNode) {
-        pNewNode->SetAttribute(XFA_ATTRIBUTE_Name, wsName.AsStringC());
+        pNewNode->SetAttribute(XFA_ATTRIBUTE_Name, wsName.AsStringView());
         pNewNode->CreateXMLMappingNode();
         m_pCreateParent->InsertChild(pNewNode);
         if (iIndex == m_iCreateCount - 1) {
diff --git a/xfa/fxfa/parser/cxfa_nodehelper.h b/xfa/fxfa/parser/cxfa_nodehelper.h
index cf6c2f17a0..4c7d7ae10c 100644
--- a/xfa/fxfa/parser/cxfa_nodehelper.h
+++ b/xfa/fxfa/parser/cxfa_nodehelper.h
@@ -49,15 +49,15 @@ class CXFA_NodeHelper {
                    bool bIsProperty = false,
                    bool bIsClassIndex = false);
   void GetNameExpression(CXFA_Node* refNode,
-                         CFX_WideString& wsName,
+                         WideString& wsName,
                          bool bIsAllPath,
                          XFA_LOGIC_TYPE eLogicType = XFA_LOGIC_NoTransparent);
   bool NodeIsTransparent(CXFA_Node* refNode);
-  bool ResolveNodes_CreateNode(CFX_WideString wsName,
-                               CFX_WideString wsCondition,
+  bool ResolveNodes_CreateNode(WideString wsName,
+                               WideString wsCondition,
                                bool bLastNode,
                                CXFA_ScriptContext* pScriptContext);
-  bool CreateNode_ForCondition(CFX_WideString& wsCondition);
+  bool CreateNode_ForCondition(WideString& wsCondition);
   void SetCreateNodeType(CXFA_Node* refNode);
   bool NodeIsProperty(CXFA_Node* refNode);
 
diff --git a/xfa/fxfa/parser/cxfa_nodelist.cpp b/xfa/fxfa/parser/cxfa_nodelist.cpp
index f47a1b1752..cea1f127a6 100644
--- a/xfa/fxfa/parser/cxfa_nodelist.cpp
+++ b/xfa/fxfa/parser/cxfa_nodelist.cpp
@@ -17,14 +17,14 @@ CXFA_NodeList::CXFA_NodeList(CXFA_Document* pDocument)
     : CXFA_Object(pDocument,
                   XFA_ObjectType::NodeList,
                   XFA_Element::NodeList,
-                  CFX_WideStringC(L"nodeList")) {
+                  WideStringView(L"nodeList")) {
   m_pDocument->GetScriptContext()->AddToCacheList(
       std::unique_ptr<CXFA_NodeList>(this));
 }
 
 CXFA_NodeList::~CXFA_NodeList() {}
 
-CXFA_Node* CXFA_NodeList::NamedItem(const CFX_WideStringC& wsName) {
+CXFA_Node* CXFA_NodeList::NamedItem(const WideStringView& wsName) {
   uint32_t dwHashCode = FX_HashCode_GetW(wsName, false);
   int32_t iCount = GetLength();
   for (int32_t i = 0; i < iCount; i++) {
@@ -105,9 +105,9 @@ void CXFA_NodeList::Script_TreelistClass_NamedItem(
     return;
   }
 
-  CFX_ByteString szName = pArguments->GetUTF8String(0);
+  ByteString szName = pArguments->GetUTF8String(0);
   CXFA_Node* pNode =
-      NamedItem(CFX_WideString::FromUTF8(szName.AsStringC()).AsStringC());
+      NamedItem(WideString::FromUTF8(szName.AsStringView()).AsStringView());
   if (!pNode)
     return;
 
diff --git a/xfa/fxfa/parser/cxfa_nodelist.h b/xfa/fxfa/parser/cxfa_nodelist.h
index 6fffb7bb67..2fccd5d7a5 100644
--- a/xfa/fxfa/parser/cxfa_nodelist.h
+++ b/xfa/fxfa/parser/cxfa_nodelist.h
@@ -19,7 +19,7 @@ class CXFA_NodeList : public CXFA_Object {
   explicit CXFA_NodeList(CXFA_Document* pDocument);
   ~CXFA_NodeList() override;
 
-  CXFA_Node* NamedItem(const CFX_WideStringC& wsName);
+  CXFA_Node* NamedItem(const WideStringView& wsName);
   virtual int32_t GetLength() = 0;
   virtual bool Append(CXFA_Node* pNode) = 0;
   virtual bool Insert(CXFA_Node* pNewNode, CXFA_Node* pBeforeNode) = 0;
diff --git a/xfa/fxfa/parser/cxfa_nodelocale.cpp b/xfa/fxfa/parser/cxfa_nodelocale.cpp
index 78b0cef278..d0d1fd34e4 100644
--- a/xfa/fxfa/parser/cxfa_nodelocale.cpp
+++ b/xfa/fxfa/parser/cxfa_nodelocale.cpp
@@ -24,7 +24,7 @@ const wchar_t g_FX_Integer[] = L"z,zzz,zzz,zzz,zzz,zzz";
 
 }  // namespace
 
-CFX_WideString XFA_PatternToString(FX_LOCALENUMSUBCATEGORY category) {
+WideString XFA_PatternToString(FX_LOCALENUMSUBCATEGORY category) {
   switch (category) {
     case FX_LOCALENUMPATTERN_Percent:
       return g_FX_Percent;
@@ -35,20 +35,19 @@ CFX_WideString XFA_PatternToString(FX_LOCALENUMSUBCATEGORY category) {
     case FX_LOCALENUMPATTERN_Integer:
       return g_FX_Integer;
   }
-  return CFX_WideString();
+  return WideString();
 }
 
 CXFA_NodeLocale::CXFA_NodeLocale(CXFA_Node* pLocale) : m_pLocale(pLocale) {}
 
 CXFA_NodeLocale::~CXFA_NodeLocale() {}
 
-CFX_WideString CXFA_NodeLocale::GetName() const {
-  return CFX_WideString(m_pLocale ? m_pLocale->GetCData(XFA_ATTRIBUTE_Name)
-                                  : nullptr);
+WideString CXFA_NodeLocale::GetName() const {
+  return WideString(m_pLocale ? m_pLocale->GetCData(XFA_ATTRIBUTE_Name)
+                              : nullptr);
 }
 
-CFX_WideString CXFA_NodeLocale::GetNumbericSymbol(
-    FX_LOCALENUMSYMBOL eType) const {
+WideString CXFA_NodeLocale::GetNumbericSymbol(FX_LOCALENUMSYMBOL eType) const {
   switch (eType) {
     case FX_LOCALENUMSYMBOL_Decimal:
       return GetSymbol(XFA_Element::NumberSymbols, L"decimal");
@@ -65,25 +64,25 @@ CFX_WideString CXFA_NodeLocale::GetNumbericSymbol(
     case FX_LOCALENUMSYMBOL_CurrencyName:
       return GetSymbol(XFA_Element::CurrencySymbols, L"isoname");
   }
-  return CFX_WideString();
+  return WideString();
 }
 
-CFX_WideString CXFA_NodeLocale::GetDateTimeSymbols() const {
+WideString CXFA_NodeLocale::GetDateTimeSymbols() const {
   CXFA_Node* pSymbols =
       m_pLocale ? m_pLocale->GetChild(0, XFA_Element::DateTimeSymbols)
                 : nullptr;
-  return pSymbols ? pSymbols->GetContent() : CFX_WideString();
+  return pSymbols ? pSymbols->GetContent() : WideString();
 }
 
-CFX_WideString CXFA_NodeLocale::GetMonthName(int32_t nMonth, bool bAbbr) const {
+WideString CXFA_NodeLocale::GetMonthName(int32_t nMonth, bool bAbbr) const {
   return GetCalendarSymbol(XFA_Element::MonthNames, nMonth, bAbbr);
 }
 
-CFX_WideString CXFA_NodeLocale::GetDayName(int32_t nWeek, bool bAbbr) const {
+WideString CXFA_NodeLocale::GetDayName(int32_t nWeek, bool bAbbr) const {
   return GetCalendarSymbol(XFA_Element::DayNames, nWeek, bAbbr);
 }
 
-CFX_WideString CXFA_NodeLocale::GetMeridiemName(bool bAM) const {
+WideString CXFA_NodeLocale::GetMeridiemName(bool bAM) const {
   return GetCalendarSymbol(XFA_Element::MeridiemNames, bAM ? 0 : 1, false);
 }
 
@@ -91,11 +90,11 @@ FX_TIMEZONE CXFA_NodeLocale::GetTimeZone() const {
   return CXFA_TimeZoneProvider().GetTimeZone();
 }
 
-CFX_WideString CXFA_NodeLocale::GetEraName(bool bAD) const {
+WideString CXFA_NodeLocale::GetEraName(bool bAD) const {
   return GetCalendarSymbol(XFA_Element::EraNames, bAD ? 1 : 0, false);
 }
 
-CFX_WideString CXFA_NodeLocale::GetDatePattern(
+WideString CXFA_NodeLocale::GetDatePattern(
     FX_LOCALEDATETIMESUBCATEGORY eType) const {
   switch (eType) {
     case FX_LOCALEDATETIMESUBCATEGORY_Short:
@@ -108,10 +107,10 @@ CFX_WideString CXFA_NodeLocale::GetDatePattern(
     case FX_LOCALEDATETIMESUBCATEGORY_Long:
       return GetSymbol(XFA_Element::DatePatterns, L"long");
   }
-  return CFX_WideString();
+  return WideString();
 }
 
-CFX_WideString CXFA_NodeLocale::GetTimePattern(
+WideString CXFA_NodeLocale::GetTimePattern(
     FX_LOCALEDATETIMESUBCATEGORY eType) const {
   switch (eType) {
     case FX_LOCALEDATETIMESUBCATEGORY_Short:
@@ -124,20 +123,19 @@ CFX_WideString CXFA_NodeLocale::GetTimePattern(
     case FX_LOCALEDATETIMESUBCATEGORY_Long:
       return GetSymbol(XFA_Element::TimePatterns, L"long");
   }
-  return CFX_WideString();
+  return WideString();
 }
 
-CFX_WideString CXFA_NodeLocale::GetNumPattern(
-    FX_LOCALENUMSUBCATEGORY eType) const {
+WideString CXFA_NodeLocale::GetNumPattern(FX_LOCALENUMSUBCATEGORY eType) const {
   return XFA_PatternToString(eType);
 }
 
 CXFA_Node* CXFA_NodeLocale::GetNodeByName(CXFA_Node* pParent,
-                                          const CFX_WideStringC& wsName) const {
+                                          const WideStringView& wsName) const {
   CXFA_Node* pChild =
       pParent ? pParent->GetNodeItem(XFA_NODEITEM_FirstChild) : nullptr;
   while (pChild) {
-    CFX_WideString wsChild;
+    WideString wsChild;
     if (pChild->GetAttribute(XFA_ATTRIBUTE_Name, wsChild)) {
       if (wsChild == wsName)
         return pChild;
@@ -147,29 +145,28 @@ CXFA_Node* CXFA_NodeLocale::GetNodeByName(CXFA_Node* pParent,
   return nullptr;
 }
 
-CFX_WideString CXFA_NodeLocale::GetSymbol(
-    XFA_Element eElement,
-    const CFX_WideStringC& symbol_type) const {
+WideString CXFA_NodeLocale::GetSymbol(XFA_Element eElement,
+                                      const WideStringView& symbol_type) const {
   CXFA_Node* pSymbols = m_pLocale ? m_pLocale->GetChild(0, eElement) : nullptr;
   CXFA_Node* pSymbol = GetNodeByName(pSymbols, symbol_type);
-  return pSymbol ? pSymbol->GetContent() : CFX_WideString();
+  return pSymbol ? pSymbol->GetContent() : WideString();
 }
 
-CFX_WideString CXFA_NodeLocale::GetCalendarSymbol(XFA_Element eElement,
-                                                  int index,
-                                                  bool bAbbr) const {
+WideString CXFA_NodeLocale::GetCalendarSymbol(XFA_Element eElement,
+                                              int index,
+                                              bool bAbbr) const {
   CXFA_Node* pCalendar =
       m_pLocale ? m_pLocale->GetChild(0, XFA_Element::CalendarSymbols)
                 : nullptr;
   if (!pCalendar)
-    return CFX_WideString();
+    return WideString();
 
   CXFA_Node* pNode = pCalendar->GetFirstChildByClass(eElement);
   for (; pNode; pNode = pNode->GetNextSameClassSibling(eElement)) {
     if (pNode->GetBoolean(XFA_ATTRIBUTE_Abbr) == bAbbr) {
       CXFA_Node* pSymbol = pNode->GetChild(index, XFA_Element::Unknown);
-      return pSymbol ? pSymbol->GetContent() : CFX_WideString();
+      return pSymbol ? pSymbol->GetContent() : WideString();
     }
   }
-  return CFX_WideString();
+  return WideString();
 }
diff --git a/xfa/fxfa/parser/cxfa_nodelocale.h b/xfa/fxfa/parser/cxfa_nodelocale.h
index e051bb6ac3..5ad0d4c626 100644
--- a/xfa/fxfa/parser/cxfa_nodelocale.h
+++ b/xfa/fxfa/parser/cxfa_nodelocale.h
@@ -14,7 +14,7 @@
 
 class CXFA_Node;
 
-CFX_WideString XFA_PatternToString(FX_LOCALENUMSUBCATEGORY category);
+WideString XFA_PatternToString(FX_LOCALENUMSUBCATEGORY category);
 
 class CXFA_NodeLocale : public IFX_Locale {
  public:
@@ -22,30 +22,28 @@ class CXFA_NodeLocale : public IFX_Locale {
   ~CXFA_NodeLocale() override;
 
   // IFX_Locale
-  CFX_WideString GetName() const override;
-  CFX_WideString GetNumbericSymbol(FX_LOCALENUMSYMBOL eType) const override;
+  WideString GetName() const override;
+  WideString GetNumbericSymbol(FX_LOCALENUMSYMBOL eType) const override;
 
-  CFX_WideString GetDateTimeSymbols() const override;
-  CFX_WideString GetMonthName(int32_t nMonth, bool bAbbr) const override;
-  CFX_WideString GetDayName(int32_t nWeek, bool bAbbr) const override;
-  CFX_WideString GetMeridiemName(bool bAM) const override;
+  WideString GetDateTimeSymbols() const override;
+  WideString GetMonthName(int32_t nMonth, bool bAbbr) const override;
+  WideString GetDayName(int32_t nWeek, bool bAbbr) const override;
+  WideString GetMeridiemName(bool bAM) const override;
   FX_TIMEZONE GetTimeZone() const override;
-  CFX_WideString GetEraName(bool bAD) const override;
+  WideString GetEraName(bool bAD) const override;
 
-  CFX_WideString GetDatePattern(
-      FX_LOCALEDATETIMESUBCATEGORY eType) const override;
-  CFX_WideString GetTimePattern(
-      FX_LOCALEDATETIMESUBCATEGORY eType) const override;
-  CFX_WideString GetNumPattern(FX_LOCALENUMSUBCATEGORY eType) const override;
+  WideString GetDatePattern(FX_LOCALEDATETIMESUBCATEGORY eType) const override;
+  WideString GetTimePattern(FX_LOCALEDATETIMESUBCATEGORY eType) const override;
+  WideString GetNumPattern(FX_LOCALENUMSUBCATEGORY eType) const override;
 
  private:
   CXFA_Node* GetNodeByName(CXFA_Node* pParent,
-                           const CFX_WideStringC& wsName) const;
-  CFX_WideString GetSymbol(XFA_Element eElement,
-                           const CFX_WideStringC& symbol_type) const;
-  CFX_WideString GetCalendarSymbol(XFA_Element eElement,
-                                   int index,
-                                   bool bAbbr) const;
+                           const WideStringView& wsName) const;
+  WideString GetSymbol(XFA_Element eElement,
+                       const WideStringView& symbol_type) const;
+  WideString GetCalendarSymbol(XFA_Element eElement,
+                               int index,
+                               bool bAbbr) const;
 
   CFX_UnownedPtr<CXFA_Node> const m_pLocale;
 };
diff --git a/xfa/fxfa/parser/cxfa_object.cpp b/xfa/fxfa/parser/cxfa_object.cpp
index 8ebedf9fed..c23420446a 100644
--- a/xfa/fxfa/parser/cxfa_object.cpp
+++ b/xfa/fxfa/parser/cxfa_object.cpp
@@ -16,7 +16,7 @@
 CXFA_Object::CXFA_Object(CXFA_Document* pDocument,
                          XFA_ObjectType objectType,
                          XFA_Element elementType,
-                         const CFX_WideStringC& elementName)
+                         const WideStringView& elementName)
     : CFXJSE_HostObject(kXFA),
       m_pDocument(pDocument),
       m_objectType(objectType),
@@ -33,7 +33,7 @@ void CXFA_Object::Script_ObjectClass_ClassName(CFXJSE_Value* pValue,
     ThrowInvalidPropertyException();
     return;
   }
-  pValue->SetString(FX_UTF8Encode(GetClassName()).AsStringC());
+  pValue->SetString(FX_UTF8Encode(GetClassName()).AsStringView());
 }
 
 void CXFA_Object::ThrowInvalidPropertyException() const {
@@ -45,7 +45,7 @@ void CXFA_Object::ThrowIndexOutOfBoundsException() const {
 }
 
 void CXFA_Object::ThrowParamCountMismatchException(
-    const CFX_WideString& method) const {
+    const WideString& method) const {
   ThrowException(L"Incorrect number of parameters calling method '%.16s'.",
                  method.c_str());
 }
@@ -55,13 +55,13 @@ void CXFA_Object::ThrowArgumentMismatchException() const {
 }
 
 void CXFA_Object::ThrowException(const wchar_t* str, ...) const {
-  CFX_WideString wsMessage;
+  WideString wsMessage;
   va_list arg_ptr;
   va_start(arg_ptr, str);
   wsMessage.FormatV(str, arg_ptr);
   va_end(arg_ptr);
   ASSERT(!wsMessage.IsEmpty());
-  FXJSE_ThrowMessage(wsMessage.UTF8Encode().AsStringC());
+  FXJSE_ThrowMessage(wsMessage.UTF8Encode().AsStringView());
 }
 
 CXFA_Node* CXFA_Object::AsNode() {
diff --git a/xfa/fxfa/parser/cxfa_object.h b/xfa/fxfa/parser/cxfa_object.h
index 4f1850f14c..49442d254d 100644
--- a/xfa/fxfa/parser/cxfa_object.h
+++ b/xfa/fxfa/parser/cxfa_object.h
@@ -35,7 +35,7 @@ class CXFA_Object : public CFXJSE_HostObject {
   CXFA_Object(CXFA_Document* pDocument,
               XFA_ObjectType objectType,
               XFA_Element eType,
-              const CFX_WideStringC& elementName);
+              const WideStringView& elementName);
   ~CXFA_Object() override;
 
   CXFA_Document* GetDocument() const { return m_pDocument.Get(); }
@@ -71,7 +71,7 @@ class CXFA_Object : public CFXJSE_HostObject {
   const CXFA_NodeList* AsNodeList() const;
 
   XFA_Element GetElementType() const { return m_elementType; }
-  CFX_WideStringC GetClassName() const { return m_elementName; }
+  WideStringView GetClassName() const { return m_elementName; }
   uint32_t GetClassHashCode() const { return m_elementNameHash; }
 
   void Script_ObjectClass_ClassName(CFXJSE_Value* pValue,
@@ -81,7 +81,7 @@ class CXFA_Object : public CFXJSE_HostObject {
   void ThrowInvalidPropertyException() const;
   void ThrowArgumentMismatchException() const;
   void ThrowIndexOutOfBoundsException() const;
-  void ThrowParamCountMismatchException(const CFX_WideString& method) const;
+  void ThrowParamCountMismatchException(const WideString& method) const;
 
  protected:
   void ThrowException(const wchar_t* str, ...) const;
@@ -91,7 +91,7 @@ class CXFA_Object : public CFXJSE_HostObject {
   const XFA_Element m_elementType;
 
   const uint32_t m_elementNameHash;
-  const CFX_WideStringC m_elementName;
+  const WideStringView m_elementName;
 };
 
 CXFA_Node* ToNode(CXFA_Object* pObj);
diff --git a/xfa/fxfa/parser/cxfa_resolveprocessor.cpp b/xfa/fxfa/parser/cxfa_resolveprocessor.cpp
index 15c3f14b23..4d0ec516b2 100644
--- a/xfa/fxfa/parser/cxfa_resolveprocessor.cpp
+++ b/xfa/fxfa/parser/cxfa_resolveprocessor.cpp
@@ -34,7 +34,7 @@ int32_t CXFA_ResolveProcessor::Resolve(CXFA_ResolveNodesData& rnd) {
   if (!rnd.m_CurObject->IsNode()) {
     if (rnd.m_dwStyles & XFA_RESOLVENODE_Attributes) {
       return ResolveForAttributeRs(rnd.m_CurObject, rnd,
-                                   rnd.m_wsName.AsStringC());
+                                   rnd.m_wsName.AsStringView());
     }
     return 0;
   }
@@ -72,7 +72,7 @@ int32_t CXFA_ResolveProcessor::Resolve(CXFA_ResolveNodesData& rnd) {
       rnd.m_Objects.push_back(rnd.m_CurObject);
     } else if ((rnd.m_dwStyles & XFA_RESOLVENODE_Attributes) &&
                ResolveForAttributeRs(rnd.m_CurObject, rnd,
-                                     rnd.m_wsName.AsStringC())) {
+                                     rnd.m_wsName.AsStringView())) {
       return 1;
     }
     if (!rnd.m_Objects.empty())
@@ -87,8 +87,8 @@ int32_t CXFA_ResolveProcessor::Resolve(CXFA_ResolveNodesData& rnd) {
 }
 
 int32_t CXFA_ResolveProcessor::ResolveAnyChild(CXFA_ResolveNodesData& rnd) {
-  CFX_WideString wsName = rnd.m_wsName;
-  CFX_WideString wsCondition = rnd.m_wsCondition;
+  WideString wsName = rnd.m_wsName;
+  WideString wsCondition = rnd.m_wsCondition;
   CXFA_Node* findNode = nullptr;
   bool bClassName = false;
   if (wsName.GetLength() && wsName[0] == '#') {
@@ -115,8 +115,8 @@ int32_t CXFA_ResolveProcessor::ResolveAnyChild(CXFA_ResolveNodesData& rnd) {
 }
 
 int32_t CXFA_ResolveProcessor::ResolveDollar(CXFA_ResolveNodesData& rnd) {
-  CFX_WideString wsName = rnd.m_wsName;
-  CFX_WideString wsCondition = rnd.m_wsCondition;
+  WideString wsName = rnd.m_wsName;
+  WideString wsCondition = rnd.m_wsCondition;
   int32_t iNameLen = wsName.GetLength();
   if (iNameLen == 1) {
     rnd.m_Objects.push_back(rnd.m_CurObject);
@@ -126,7 +126,7 @@ int32_t CXFA_ResolveProcessor::ResolveDollar(CXFA_ResolveNodesData& rnd) {
     return -1;
   }
   XFA_HashCode dwNameHash = static_cast<XFA_HashCode>(FX_HashCode_GetW(
-      CFX_WideStringC(wsName.c_str() + 1, iNameLen - 1), false));
+      WideStringView(wsName.c_str() + 1, iNameLen - 1), false));
   if (dwNameHash == XFA_HASHCODE_Xfa) {
     rnd.m_Objects.push_back(rnd.m_pSC->GetDocument()->GetRoot());
   } else {
@@ -154,7 +154,7 @@ int32_t CXFA_ResolveProcessor::ResolveExcalmatory(CXFA_ResolveNodesData& rnd) {
   rndFind.m_CurObject = datasets;
   rndFind.m_wsName = rnd.m_wsName.Right(rnd.m_wsName.GetLength() - 1);
   rndFind.m_uHashName = static_cast<XFA_HashCode>(
-      FX_HashCode_GetW(rndFind.m_wsName.AsStringC(), false));
+      FX_HashCode_GetW(rndFind.m_wsName.AsStringView(), false));
   rndFind.m_nLevel = rnd.m_nLevel + 1;
   rndFind.m_dwStyles = XFA_RESOLVENODE_Children;
   rndFind.m_wsCondition = rnd.m_wsCondition;
@@ -165,10 +165,10 @@ int32_t CXFA_ResolveProcessor::ResolveExcalmatory(CXFA_ResolveNodesData& rnd) {
 }
 
 int32_t CXFA_ResolveProcessor::ResolveNumberSign(CXFA_ResolveNodesData& rnd) {
-  CFX_WideString wsName = rnd.m_wsName.Right(rnd.m_wsName.GetLength() - 1);
-  CFX_WideString wsCondition = rnd.m_wsCondition;
+  WideString wsName = rnd.m_wsName.Right(rnd.m_wsName.GetLength() - 1);
+  WideString wsCondition = rnd.m_wsCondition;
   CXFA_Node* curNode = ToNode(rnd.m_CurObject);
-  if (ResolveForAttributeRs(curNode, rnd, wsName.AsStringC()))
+  if (ResolveForAttributeRs(curNode, rnd, wsName.AsStringView()))
     return 1;
 
   CXFA_ResolveNodesData rndFind;
@@ -179,7 +179,7 @@ int32_t CXFA_ResolveProcessor::ResolveNumberSign(CXFA_ResolveNodesData& rnd) {
   rndFind.m_dwStyles &= ~XFA_RESOLVENODE_Attributes;
   rndFind.m_wsName = wsName;
   rndFind.m_uHashName = static_cast<XFA_HashCode>(
-      FX_HashCode_GetW(rndFind.m_wsName.AsStringC(), false));
+      FX_HashCode_GetW(rndFind.m_wsName.AsStringView(), false));
   rndFind.m_wsCondition = wsCondition;
   rndFind.m_CurObject = curNode;
   ResolveNormal(rndFind);
@@ -199,7 +199,7 @@ int32_t CXFA_ResolveProcessor::ResolveNumberSign(CXFA_ResolveNodesData& rnd) {
 int32_t CXFA_ResolveProcessor::ResolveForAttributeRs(
     CXFA_Object* curNode,
     CXFA_ResolveNodesData& rnd,
-    const CFX_WideStringC& strAttr) {
+    const WideStringView& strAttr) {
   const XFA_SCRIPTATTRIBUTEINFO* lpScriptAttribute =
       XFA_GetScriptAttributeByName(curNode->GetElementType(), strAttr);
   if (!lpScriptAttribute)
@@ -218,9 +218,9 @@ int32_t CXFA_ResolveProcessor::ResolveNormal(CXFA_ResolveNodesData& rnd) {
   CXFA_Node* curNode = rnd.m_CurObject->AsNode();
   size_t nNum = rnd.m_Objects.size();
   uint32_t dwStyles = rnd.m_dwStyles;
-  CFX_WideString& wsName = rnd.m_wsName;
+  WideString& wsName = rnd.m_wsName;
   XFA_HashCode uNameHash = rnd.m_uHashName;
-  CFX_WideString& wsCondition = rnd.m_wsCondition;
+  WideString& wsCondition = rnd.m_wsCondition;
   CXFA_ResolveNodesData rndFind;
   rndFind.m_wsName = rnd.m_wsName;
   rndFind.m_wsCondition = rnd.m_wsCondition;
@@ -256,7 +256,7 @@ int32_t CXFA_ResolveProcessor::ResolveNormal(CXFA_ResolveNodesData& rnd) {
     } else {
       rndFind.m_CurObject = pVariablesNode;
       SetStylesForChild(dwStyles, rndFind);
-      CFX_WideString wsSaveCondition = rndFind.m_wsCondition;
+      WideString wsSaveCondition = rndFind.m_wsCondition;
       rndFind.m_wsCondition.clear();
       ResolveNormal(rndFind);
       rndFind.m_wsCondition = wsSaveCondition;
@@ -288,7 +288,7 @@ int32_t CXFA_ResolveProcessor::ResolveNormal(CXFA_ResolveNodesData& rnd) {
           bSetFlag = true;
         }
         rndFind.m_CurObject = child;
-        CFX_WideString wsSaveCondition = rndFind.m_wsCondition;
+        WideString wsSaveCondition = rndFind.m_wsCondition;
         rndFind.m_wsCondition.clear();
         ResolveNormal(rndFind);
         rndFind.m_wsCondition = wsSaveCondition;
@@ -317,7 +317,7 @@ int32_t CXFA_ResolveProcessor::ResolveNormal(CXFA_ResolveNodesData& rnd) {
     }
   }
   if (dwStyles & XFA_RESOLVENODE_Attributes) {
-    if (ResolveForAttributeRs(curNode, rnd, wsName.AsStringC()))
+    if (ResolveForAttributeRs(curNode, rnd, wsName.AsStringView()))
       return 1;
   }
   if (dwStyles & XFA_RESOLVENODE_Properties) {
@@ -346,7 +346,7 @@ int32_t CXFA_ResolveProcessor::ResolveNormal(CXFA_ResolveNodesData& rnd) {
         pProp = pInstanceManager->GetProperty(0, XFA_Element::Occur, true);
       }
     } else {
-      XFA_Element eType = XFA_GetElementTypeForName(wsName.AsStringC());
+      XFA_Element eType = XFA_GetElementTypeForName(wsName.AsStringView());
       if (eType != XFA_Element::Unknown) {
         pProp = curNode->AsNode()->GetProperty(0, eType,
                                                eType != XFA_Element::PageSet);
@@ -419,7 +419,7 @@ int32_t CXFA_ResolveProcessor::ResolveNormal(CXFA_ResolveNodesData& rnd) {
       }
       if (bInnerSearch) {
         rndFind.m_CurObject = child;
-        CFX_WideString wsOriginCondition = rndFind.m_wsCondition;
+        WideString wsOriginCondition = rndFind.m_wsCondition;
         rndFind.m_wsCondition.clear();
         uint32_t dwOriginStyle = rndFind.m_dwStyles;
         rndFind.m_dwStyles = dwOriginStyle | XFA_RESOLVENODE_ALL;
@@ -488,7 +488,7 @@ int32_t CXFA_ResolveProcessor::ResolvePopStack(std::vector<int32_t>* stack) {
   return nType;
 }
 
-int32_t CXFA_ResolveProcessor::GetFilter(const CFX_WideStringC& wsExpression,
+int32_t CXFA_ResolveProcessor::GetFilter(const WideStringView& wsExpression,
                                          int32_t nStart,
                                          CXFA_ResolveNodesData& rnd) {
   ASSERT(nStart > -1);
@@ -496,8 +496,8 @@ int32_t CXFA_ResolveProcessor::GetFilter(const CFX_WideStringC& wsExpression,
   if (nStart >= iLength) {
     return 0;
   }
-  CFX_WideString& wsName = rnd.m_wsName;
-  CFX_WideString& wsCondition = rnd.m_wsCondition;
+  WideString& wsName = rnd.m_wsName;
+  WideString& wsCondition = rnd.m_wsCondition;
   wchar_t* pNameBuf = wsName.GetBuffer(iLength - nStart);
   wchar_t* pConditionBuf = wsCondition.GetBuffer(iLength - nStart);
   int32_t nNameCount = 0;
@@ -585,11 +585,11 @@ int32_t CXFA_ResolveProcessor::GetFilter(const CFX_WideStringC& wsExpression,
   wsCondition.TrimLeft();
   wsCondition.TrimRight();
   rnd.m_uHashName =
-      static_cast<XFA_HashCode>(FX_HashCode_GetW(wsName.AsStringC(), false));
+      static_cast<XFA_HashCode>(FX_HashCode_GetW(wsName.AsStringView(), false));
   return nStart;
 }
 void CXFA_ResolveProcessor::ConditionArray(int32_t iCurIndex,
-                                           CFX_WideString wsCondition,
+                                           WideString wsCondition,
                                            int32_t iFoundCount,
                                            CXFA_ResolveNodesData& rnd) {
   int32_t iLen = wsCondition.GetLength();
@@ -635,7 +635,7 @@ void CXFA_ResolveProcessor::ConditionArray(int32_t iCurIndex,
   if (iFoundCount == 1 && !iLen) {
     return;
   }
-  CFX_WideString wsIndex;
+  WideString wsIndex;
   wsIndex = wsCondition.Mid(i, iLen - 1 - i);
   int32_t iIndex = wsIndex.GetInteger();
   if (bRelative) {
@@ -655,11 +655,11 @@ void CXFA_ResolveProcessor::ConditionArray(int32_t iCurIndex,
 }
 
 void CXFA_ResolveProcessor::DoPredicateFilter(int32_t iCurIndex,
-                                              CFX_WideString wsCondition,
+                                              WideString wsCondition,
                                               int32_t iFoundCount,
                                               CXFA_ResolveNodesData& rnd) {
   ASSERT(iFoundCount == pdfium::CollectionSize<int32_t>(rnd.m_Objects));
-  CFX_WideString wsExpression;
+  WideString wsExpression;
   XFA_SCRIPTLANGTYPE eLangType = XFA_SCRIPTLANGTYPE_Unkown;
   if (wsCondition.Left(2) == L".[" && wsCondition.Last() == L']') {
     eLangType = XFA_SCRIPTLANGTYPE_Formcalc;
@@ -673,7 +673,7 @@ void CXFA_ResolveProcessor::DoPredicateFilter(int32_t iCurIndex,
   wsExpression = wsCondition.Mid(2, wsCondition.GetLength() - 3);
   for (int32_t i = iFoundCount - 1; i >= 0; i--) {
     auto pRetValue = pdfium::MakeUnique<CFXJSE_Value>(rnd.m_pSC->GetRuntime());
-    bool bRet = pContext->RunScript(eLangType, wsExpression.AsStringC(),
+    bool bRet = pContext->RunScript(eLangType, wsExpression.AsStringView(),
                                     pRetValue.get(), rnd.m_Objects[i]);
     if (!bRet || !pRetValue->ToBoolean())
       rnd.m_Objects.erase(rnd.m_Objects.begin() + i);
@@ -681,7 +681,7 @@ void CXFA_ResolveProcessor::DoPredicateFilter(int32_t iCurIndex,
 }
 
 void CXFA_ResolveProcessor::FilterCondition(CXFA_ResolveNodesData& rnd,
-                                            CFX_WideString wsCondition) {
+                                            WideString wsCondition) {
   int32_t iCurrIndex = 0;
   const std::vector<CXFA_Node*>* pArray = rnd.m_pSC->GetUpObjectArray();
   if (!pArray->empty()) {
@@ -753,7 +753,7 @@ void CXFA_ResolveProcessor::SetStylesForChild(uint32_t dwParentStyles,
 
 int32_t CXFA_ResolveProcessor::SetResultCreateNode(
     XFA_RESOLVENODE_RS& resolveNodeRS,
-    CFX_WideString& wsLastCondition) {
+    WideString& wsLastCondition) {
   if (m_pNodeHelper->m_pCreateParent)
     resolveNodeRS.objects.push_back(m_pNodeHelper->m_pCreateParent);
   else
@@ -767,7 +767,7 @@ int32_t CXFA_ResolveProcessor::SetResultCreateNode(
   return pdfium::CollectionSize<int32_t>(resolveNodeRS.objects);
 }
 
-void CXFA_ResolveProcessor::SetIndexDataBind(CFX_WideString& wsNextCondition,
+void CXFA_ResolveProcessor::SetIndexDataBind(WideString& wsNextCondition,
                                              int32_t& iIndex,
                                              int32_t iCount) {
   if (m_pNodeHelper->CreateNode_ForCondition(wsNextCondition)) {
diff --git a/xfa/fxfa/parser/cxfa_resolveprocessor.h b/xfa/fxfa/parser/cxfa_resolveprocessor.h
index f4eafea023..b48ee36476 100644
--- a/xfa/fxfa/parser/cxfa_resolveprocessor.h
+++ b/xfa/fxfa/parser/cxfa_resolveprocessor.h
@@ -22,9 +22,9 @@ class CXFA_ResolveNodesData {
 
   CXFA_ScriptContext* m_pSC;
   CXFA_Object* m_CurObject;
-  CFX_WideString m_wsName;
+  WideString m_wsName;
   XFA_HashCode m_uHashName;
-  CFX_WideString m_wsCondition;
+  WideString m_wsCondition;
   int32_t m_nLevel;
   std::vector<CXFA_Object*> m_Objects;  // Not owned.
   uint32_t m_dwStyles;
@@ -38,12 +38,12 @@ class CXFA_ResolveProcessor {
   ~CXFA_ResolveProcessor();
 
   int32_t Resolve(CXFA_ResolveNodesData& rnd);
-  int32_t GetFilter(const CFX_WideStringC& wsExpression,
+  int32_t GetFilter(const WideStringView& wsExpression,
                     int32_t nStart,
                     CXFA_ResolveNodesData& rnd);
   int32_t SetResultCreateNode(XFA_RESOLVENODE_RS& resolveNodeRS,
-                              CFX_WideString& wsLastCondition);
-  void SetIndexDataBind(CFX_WideString& wsNextCondition,
+                              WideString& wsLastCondition);
+  void SetIndexDataBind(WideString& wsNextCondition,
                         int32_t& iIndex,
                         int32_t iCount);
   void SetCurStart(int32_t start) { m_iCurStart = start; }
@@ -53,7 +53,7 @@ class CXFA_ResolveProcessor {
  private:
   int32_t ResolveForAttributeRs(CXFA_Object* curNode,
                                 CXFA_ResolveNodesData& rnd,
-                                const CFX_WideStringC& strAttr);
+                                const WideStringView& strAttr);
   int32_t ResolveAnyChild(CXFA_ResolveNodesData& rnd);
   int32_t ResolveDollar(CXFA_ResolveNodesData& rnd);
   int32_t ResolveExcalmatory(CXFA_ResolveNodesData& rnd);
@@ -64,14 +64,14 @@ class CXFA_ResolveProcessor {
   void SetStylesForChild(uint32_t dwParentStyles, CXFA_ResolveNodesData& rnd);
 
   void ConditionArray(int32_t iCurIndex,
-                      CFX_WideString wsCondition,
+                      WideString wsCondition,
                       int32_t iFoundCount,
                       CXFA_ResolveNodesData& rnd);
   void DoPredicateFilter(int32_t iCurIndex,
-                         CFX_WideString wsCondition,
+                         WideString wsCondition,
                          int32_t iFoundCount,
                          CXFA_ResolveNodesData& rnd);
-  void FilterCondition(CXFA_ResolveNodesData& rnd, CFX_WideString wsCondition);
+  void FilterCondition(CXFA_ResolveNodesData& rnd, WideString wsCondition);
 
   int32_t m_iCurStart;
   std::unique_ptr<CXFA_NodeHelper> m_pNodeHelper;
diff --git a/xfa/fxfa/parser/cxfa_script.cpp b/xfa/fxfa/parser/cxfa_script.cpp
index ccd1997c47..6b6f6ba1c8 100644
--- a/xfa/fxfa/parser/cxfa_script.cpp
+++ b/xfa/fxfa/parser/cxfa_script.cpp
@@ -11,7 +11,7 @@
 CXFA_Script::CXFA_Script(CXFA_Node* pNode) : CXFA_Data(pNode) {}
 
 XFA_SCRIPTTYPE CXFA_Script::GetContentType() {
-  CFX_WideStringC cData;
+  WideStringView cData;
   if (m_pNode->TryCData(XFA_ATTRIBUTE_ContentType, cData, false)) {
     if (cData == L"application/x-javascript")
       return XFA_SCRIPTTYPE_Javascript;
@@ -26,6 +26,6 @@ int32_t CXFA_Script::GetRunAt() {
   return m_pNode->GetEnum(XFA_ATTRIBUTE_RunAt);
 }
 
-void CXFA_Script::GetExpression(CFX_WideString& wsExpression) {
+void CXFA_Script::GetExpression(WideString& wsExpression) {
   m_pNode->TryContent(wsExpression);
 }
diff --git a/xfa/fxfa/parser/cxfa_script.h b/xfa/fxfa/parser/cxfa_script.h
index d89062487d..bb98f58abc 100644
--- a/xfa/fxfa/parser/cxfa_script.h
+++ b/xfa/fxfa/parser/cxfa_script.h
@@ -26,7 +26,7 @@ class CXFA_Script : public CXFA_Data {
 
   XFA_SCRIPTTYPE GetContentType();
   int32_t GetRunAt();
-  void GetExpression(CFX_WideString& wsExpression);
+  void GetExpression(WideString& wsExpression);
 };
 
 #endif  // XFA_FXFA_PARSER_CXFA_SCRIPT_H_
diff --git a/xfa/fxfa/parser/cxfa_scriptcontext.cpp b/xfa/fxfa/parser/cxfa_scriptcontext.cpp
index 98b5da057f..38d503962d 100644
--- a/xfa/fxfa/parser/cxfa_scriptcontext.cpp
+++ b/xfa/fxfa/parser/cxfa_scriptcontext.cpp
@@ -81,7 +81,7 @@ CXFA_ThisProxy* ToThisProxy(CFXJSE_Value* pValue, CFXJSE_Class* pClass) {
 }
 
 const XFA_METHODINFO* GetMethodByName(XFA_Element eElement,
-                                      const CFX_WideStringC& wsMethodName) {
+                                      const WideStringView& wsMethodName) {
   if (wsMethodName.IsEmpty())
     return nullptr;
 
@@ -146,10 +146,10 @@ void CXFA_ScriptContext::Initialize(v8::Isolate* pIsolate) {
 }
 
 bool CXFA_ScriptContext::RunScript(XFA_SCRIPTLANGTYPE eScriptType,
-                                   const CFX_WideStringC& wsScript,
+                                   const WideStringView& wsScript,
                                    CFXJSE_Value* hRetValue,
                                    CXFA_Object* pThisObject) {
-  CFX_ByteString btScript;
+  ByteString btScript;
   CFX_AutoRestorer<XFA_SCRIPTLANGTYPE> typeRestorer(&m_eScriptType);
   m_eScriptType = eScriptType;
   if (eScriptType == XFA_SCRIPTLANGTYPE_Formcalc) {
@@ -162,7 +162,7 @@ bool CXFA_ScriptContext::RunScript(XFA_SCRIPTLANGTYPE eScriptType,
       hRetValue->SetUndefined();
       return false;
     }
-    btScript = FX_UTF8Encode(wsJavaScript.AsStringC());
+    btScript = FX_UTF8Encode(wsJavaScript.AsStringView());
   } else {
     btScript = FX_UTF8Encode(wsScript);
   }
@@ -173,21 +173,21 @@ bool CXFA_ScriptContext::RunScript(XFA_SCRIPTLANGTYPE eScriptType,
 }
 
 void CXFA_ScriptContext::GlobalPropertySetter(CFXJSE_Value* pObject,
-                                              const CFX_ByteStringC& szPropName,
+                                              const ByteStringView& szPropName,
                                               CFXJSE_Value* pValue) {
   CXFA_Object* lpOrginalNode = ToObject(pObject, nullptr);
   CXFA_Document* pDoc = lpOrginalNode->GetDocument();
   CXFA_ScriptContext* lpScriptContext = pDoc->GetScriptContext();
   CXFA_Object* lpCurNode = lpScriptContext->GetVariablesThis(lpOrginalNode);
-  CFX_WideString wsPropName = CFX_WideString::FromUTF8(szPropName);
+  WideString wsPropName = WideString::FromUTF8(szPropName);
   uint32_t dwFlag = XFA_RESOLVENODE_Parent | XFA_RESOLVENODE_Siblings |
                     XFA_RESOLVENODE_Children | XFA_RESOLVENODE_Properties |
                     XFA_RESOLVENODE_Attributes;
   CXFA_Node* pRefNode = ToNode(lpScriptContext->GetThisObject());
   if (lpOrginalNode->IsVariablesThis())
     pRefNode = ToNode(lpCurNode);
-  if (lpScriptContext->QueryNodeByFlag(pRefNode, wsPropName.AsStringC(), pValue,
-                                       dwFlag, true)) {
+  if (lpScriptContext->QueryNodeByFlag(pRefNode, wsPropName.AsStringView(),
+                                       pValue, dwFlag, true)) {
     return;
   }
   if (lpOrginalNode->IsVariablesThis()) {
@@ -204,7 +204,7 @@ void CXFA_ScriptContext::GlobalPropertySetter(CFXJSE_Value* pObject,
                                                   szPropName, pValue);
 }
 bool CXFA_ScriptContext::QueryNodeByFlag(CXFA_Node* refNode,
-                                         const CFX_WideStringC& propname,
+                                         const WideStringView& propname,
                                          CFXJSE_Value* pValue,
                                          uint32_t dwFlag,
                                          bool bSetting) {
@@ -227,20 +227,20 @@ bool CXFA_ScriptContext::QueryNodeByFlag(CXFA_Node* refNode,
   return true;
 }
 void CXFA_ScriptContext::GlobalPropertyGetter(CFXJSE_Value* pObject,
-                                              const CFX_ByteStringC& szPropName,
+                                              const ByteStringView& szPropName,
                                               CFXJSE_Value* pValue) {
   CXFA_Object* pOriginalObject = ToObject(pObject, nullptr);
   CXFA_Document* pDoc = pOriginalObject->GetDocument();
   CXFA_ScriptContext* lpScriptContext = pDoc->GetScriptContext();
   CXFA_Object* lpCurNode = lpScriptContext->GetVariablesThis(pOriginalObject);
-  CFX_WideString wsPropName = CFX_WideString::FromUTF8(szPropName);
+  WideString wsPropName = WideString::FromUTF8(szPropName);
   if (lpScriptContext->GetType() == XFA_SCRIPTLANGTYPE_Formcalc) {
     if (szPropName == kFormCalcRuntime) {
       lpScriptContext->m_FM2JSContext->GlobalPropertyGetter(pValue);
       return;
     }
     XFA_HashCode uHashCode = static_cast<XFA_HashCode>(
-        FX_HashCode_GetW(wsPropName.AsStringC(), false));
+        FX_HashCode_GetW(wsPropName.AsStringView(), false));
     if (uHashCode != XFA_HASHCODE_Layout) {
       CXFA_Object* pObj =
           lpScriptContext->GetDocument()->GetXFAObject(uHashCode);
@@ -256,13 +256,13 @@ void CXFA_ScriptContext::GlobalPropertyGetter(CFXJSE_Value* pObject,
   if (pOriginalObject->IsVariablesThis()) {
     pRefNode = ToNode(lpCurNode);
   }
-  if (lpScriptContext->QueryNodeByFlag(pRefNode, wsPropName.AsStringC(), pValue,
-                                       dwFlag, false)) {
+  if (lpScriptContext->QueryNodeByFlag(pRefNode, wsPropName.AsStringView(),
+                                       pValue, dwFlag, false)) {
     return;
   }
   dwFlag = XFA_RESOLVENODE_Parent | XFA_RESOLVENODE_Siblings;
-  if (lpScriptContext->QueryNodeByFlag(pRefNode, wsPropName.AsStringC(), pValue,
-                                       dwFlag, false)) {
+  if (lpScriptContext->QueryNodeByFlag(pRefNode, wsPropName.AsStringView(),
+                                       pValue, dwFlag, false)) {
     return;
   }
   CXFA_Object* pScriptObject =
@@ -280,14 +280,14 @@ void CXFA_ScriptContext::GlobalPropertyGetter(CFXJSE_Value* pObject,
                                                   szPropName, pValue);
 }
 void CXFA_ScriptContext::NormalPropertyGetter(CFXJSE_Value* pOriginalValue,
-                                              const CFX_ByteStringC& szPropName,
+                                              const ByteStringView& szPropName,
                                               CFXJSE_Value* pReturnValue) {
   CXFA_Object* pOriginalObject = ToObject(pOriginalValue, nullptr);
   if (!pOriginalObject) {
     pReturnValue->SetUndefined();
     return;
   }
-  CFX_WideString wsPropName = CFX_WideString::FromUTF8(szPropName);
+  WideString wsPropName = WideString::FromUTF8(szPropName);
   CXFA_ScriptContext* lpScriptContext =
       pOriginalObject->GetDocument()->GetScriptContext();
   CXFA_Object* pObject = lpScriptContext->GetVariablesThis(pOriginalObject);
@@ -300,7 +300,7 @@ void CXFA_ScriptContext::NormalPropertyGetter(CFXJSE_Value* pOriginalValue,
   uint32_t dwFlag = XFA_RESOLVENODE_Children | XFA_RESOLVENODE_Properties |
                     XFA_RESOLVENODE_Attributes;
   bool bRet = lpScriptContext->QueryNodeByFlag(
-      ToNode(pObject), wsPropName.AsStringC(), pReturnValue, dwFlag, false);
+      ToNode(pObject), wsPropName.AsStringView(), pReturnValue, dwFlag, false);
   if (bRet) {
     return;
   }
@@ -308,8 +308,9 @@ void CXFA_ScriptContext::NormalPropertyGetter(CFXJSE_Value* pOriginalValue,
       (lpScriptContext->GetType() == XFA_SCRIPTLANGTYPE_Javascript &&
        !lpScriptContext->IsStrictScopeInJavaScript())) {
     dwFlag = XFA_RESOLVENODE_Parent | XFA_RESOLVENODE_Siblings;
-    bRet = lpScriptContext->QueryNodeByFlag(
-        ToNode(pObject), wsPropName.AsStringC(), pReturnValue, dwFlag, false);
+    bRet = lpScriptContext->QueryNodeByFlag(ToNode(pObject),
+                                            wsPropName.AsStringView(),
+                                            pReturnValue, dwFlag, false);
   }
   if (bRet) {
     return;
@@ -325,7 +326,7 @@ void CXFA_ScriptContext::NormalPropertyGetter(CFXJSE_Value* pOriginalValue,
   }
 }
 void CXFA_ScriptContext::NormalPropertySetter(CFXJSE_Value* pOriginalValue,
-                                              const CFX_ByteStringC& szPropName,
+                                              const ByteStringView& szPropName,
                                               CFXJSE_Value* pReturnValue) {
   CXFA_Object* pOriginalObject = ToObject(pOriginalValue, nullptr);
   if (!pOriginalObject)
@@ -334,9 +335,9 @@ void CXFA_ScriptContext::NormalPropertySetter(CFXJSE_Value* pOriginalValue,
   CXFA_ScriptContext* lpScriptContext =
       pOriginalObject->GetDocument()->GetScriptContext();
   CXFA_Object* pObject = lpScriptContext->GetVariablesThis(pOriginalObject);
-  CFX_WideString wsPropName = CFX_WideString::FromUTF8(szPropName);
+  WideString wsPropName = WideString::FromUTF8(szPropName);
   const XFA_SCRIPTATTRIBUTEINFO* lpAttributeInfo = XFA_GetScriptAttributeByName(
-      pObject->GetElementType(), wsPropName.AsStringC());
+      pObject->GetElementType(), wsPropName.AsStringView());
   if (lpAttributeInfo) {
     (pObject->*(lpAttributeInfo->lpfnCallback))(
         pReturnValue, true, (XFA_ATTRIBUTE)lpAttributeInfo->eAttribute);
@@ -347,17 +348,17 @@ void CXFA_ScriptContext::NormalPropertySetter(CFXJSE_Value* pOriginalValue,
       }
       CXFA_Node* pNode = ToNode(pObject);
       CXFA_Node* pPropOrChild = nullptr;
-      XFA_Element eType = XFA_GetElementTypeForName(wsPropName.AsStringC());
+      XFA_Element eType = XFA_GetElementTypeForName(wsPropName.AsStringView());
       if (eType != XFA_Element::Unknown)
         pPropOrChild = pNode->GetProperty(0, eType);
       else
-        pPropOrChild = pNode->GetFirstChildByName(wsPropName.AsStringC());
+        pPropOrChild = pNode->GetFirstChildByName(wsPropName.AsStringView());
 
       if (pPropOrChild) {
-        CFX_WideString wsDefaultName(L"{default}");
+        WideString wsDefaultName(L"{default}");
         const XFA_SCRIPTATTRIBUTEINFO* lpAttrInfo =
             XFA_GetScriptAttributeByName(pPropOrChild->GetElementType(),
-                                         wsDefaultName.AsStringC());
+                                         wsDefaultName.AsStringView());
         if (lpAttrInfo) {
           (pPropOrChild->*(lpAttrInfo->lpfnCallback))(
               pReturnValue, true, (XFA_ATTRIBUTE)lpAttrInfo->eAttribute);
@@ -375,7 +376,7 @@ void CXFA_ScriptContext::NormalPropertySetter(CFXJSE_Value* pOriginalValue,
 }
 int32_t CXFA_ScriptContext::NormalPropTypeGetter(
     CFXJSE_Value* pOriginalValue,
-    const CFX_ByteStringC& szPropName,
+    const ByteStringView& szPropName,
     bool bQueryIn) {
   CXFA_Object* pObject = ToObject(pOriginalValue, nullptr);
   if (!pObject)
@@ -385,19 +386,19 @@ int32_t CXFA_ScriptContext::NormalPropTypeGetter(
       pObject->GetDocument()->GetScriptContext();
   pObject = lpScriptContext->GetVariablesThis(pObject);
   XFA_Element eType = pObject->GetElementType();
-  CFX_WideString wsPropName = CFX_WideString::FromUTF8(szPropName);
-  if (GetMethodByName(eType, wsPropName.AsStringC())) {
+  WideString wsPropName = WideString::FromUTF8(szPropName);
+  if (GetMethodByName(eType, wsPropName.AsStringView())) {
     return FXJSE_ClassPropType_Method;
   }
   if (bQueryIn &&
-      !XFA_GetScriptAttributeByName(eType, wsPropName.AsStringC())) {
+      !XFA_GetScriptAttributeByName(eType, wsPropName.AsStringView())) {
     return FXJSE_ClassPropType_None;
   }
   return FXJSE_ClassPropType_Property;
 }
 int32_t CXFA_ScriptContext::GlobalPropTypeGetter(
     CFXJSE_Value* pOriginalValue,
-    const CFX_ByteStringC& szPropName,
+    const ByteStringView& szPropName,
     bool bQueryIn) {
   CXFA_Object* pObject = ToObject(pOriginalValue, nullptr);
   if (!pObject)
@@ -407,14 +408,14 @@ int32_t CXFA_ScriptContext::GlobalPropTypeGetter(
       pObject->GetDocument()->GetScriptContext();
   pObject = lpScriptContext->GetVariablesThis(pObject);
   XFA_Element eType = pObject->GetElementType();
-  CFX_WideString wsPropName = CFX_WideString::FromUTF8(szPropName);
-  if (GetMethodByName(eType, wsPropName.AsStringC())) {
+  WideString wsPropName = WideString::FromUTF8(szPropName);
+  if (GetMethodByName(eType, wsPropName.AsStringView())) {
     return FXJSE_ClassPropType_Method;
   }
   return FXJSE_ClassPropType_Property;
 }
 void CXFA_ScriptContext::NormalMethodCall(CFXJSE_Value* pThis,
-                                          const CFX_ByteStringC& szFuncName,
+                                          const ByteStringView& szFuncName,
                                           CFXJSE_Arguments& args) {
   CXFA_Object* pObject = ToObject(pThis, nullptr);
   if (!pObject)
@@ -423,9 +424,9 @@ void CXFA_ScriptContext::NormalMethodCall(CFXJSE_Value* pThis,
   CXFA_ScriptContext* lpScriptContext =
       pObject->GetDocument()->GetScriptContext();
   pObject = lpScriptContext->GetVariablesThis(pObject);
-  CFX_WideString wsFunName = CFX_WideString::FromUTF8(szFuncName);
+  WideString wsFunName = WideString::FromUTF8(szFuncName);
   const XFA_METHODINFO* lpMethodInfo =
-      GetMethodByName(pObject->GetElementType(), wsFunName.AsStringC());
+      GetMethodByName(pObject->GetElementType(), wsFunName.AsStringView());
   if (!lpMethodInfo)
     return;
 
@@ -488,11 +489,11 @@ bool CXFA_ScriptContext::RunVariablesScript(CXFA_Node* pScriptNode) {
   if (!pTextNode)
     return false;
 
-  CFX_WideStringC wsScript;
+  WideStringView wsScript;
   if (!pTextNode->TryCData(XFA_ATTRIBUTE_Value, wsScript))
     return false;
 
-  CFX_ByteString btScript = FX_UTF8Encode(wsScript);
+  ByteString btScript = FX_UTF8Encode(wsScript);
   auto hRetValue = pdfium::MakeUnique<CFXJSE_Value>(m_pIsolate);
   CXFA_Node* pThisObject = pParent->GetNodeItem(XFA_NODEITEM_Parent);
   CFXJSE_Context* pVariablesContext =
@@ -503,7 +504,7 @@ bool CXFA_ScriptContext::RunVariablesScript(CXFA_Node* pScriptNode) {
 }
 
 bool CXFA_ScriptContext::QueryVariableValue(CXFA_Node* pScriptNode,
-                                            const CFX_ByteStringC& szPropName,
+                                            const ByteStringView& szPropName,
                                             CFXJSE_Value* pValue,
                                             bool bGetter) {
   if (!pScriptNode || pScriptNode->GetElementType() != XFA_Element::Script)
@@ -544,7 +545,7 @@ void CXFA_ScriptContext::DefineJsClass() {
 }
 
 void CXFA_ScriptContext::RemoveBuiltInObjs(CFXJSE_Context* pContext) const {
-  static const CFX_ByteStringC OBJ_NAME[2] = {"Number", "Date"};
+  static const ByteStringView OBJ_NAME[2] = {"Number", "Date"};
   std::unique_ptr<CFXJSE_Value> pObject = pContext->GetGlobalObject();
   auto hProp = pdfium::MakeUnique<CFXJSE_Value>(m_pIsolate);
   for (int i = 0; i < 2; ++i) {
@@ -557,7 +558,7 @@ CFXJSE_Class* CXFA_ScriptContext::GetJseNormalClass() {
 }
 
 int32_t CXFA_ScriptContext::ResolveObjects(CXFA_Object* refObject,
-                                           const CFX_WideStringC& wsExpression,
+                                           const WideStringView& wsExpression,
                                            XFA_RESOLVENODE_RS& resolveNodeRS,
                                            uint32_t dwStyles,
                                            CXFA_Node* bindNode) {
@@ -757,7 +758,7 @@ int32_t CXFA_ScriptContext::GetIndexByClassName(CXFA_Node* refNode) {
                                 lpNodeHelper->NodeIsProperty(refNode), true);
 }
 void CXFA_ScriptContext::GetSomExpression(CXFA_Node* refNode,
-                                          CFX_WideString& wsExpression) {
+                                          WideString& wsExpression) {
   CXFA_NodeHelper* lpNodeHelper = m_ResolveProcessor->GetNodeHelper();
   lpNodeHelper->GetNameExpression(refNode, wsExpression, true,
                                   XFA_LOGIC_Transparent);
diff --git a/xfa/fxfa/parser/cxfa_scriptcontext.h b/xfa/fxfa/parser/cxfa_scriptcontext.h
index 45e6897a4c..d3632e2859 100644
--- a/xfa/fxfa/parser/cxfa_scriptcontext.h
+++ b/xfa/fxfa/parser/cxfa_scriptcontext.h
@@ -30,12 +30,12 @@ class CXFA_ScriptContext {
   void SetEventParam(CXFA_EventParam param) { m_eventParam = param; }
   CXFA_EventParam* GetEventParam() { return &m_eventParam; }
   bool RunScript(XFA_SCRIPTLANGTYPE eScriptType,
-                 const CFX_WideStringC& wsScript,
+                 const WideStringView& wsScript,
                  CFXJSE_Value* pRetValue,
                  CXFA_Object* pThisObject);
 
   int32_t ResolveObjects(CXFA_Object* refObject,
-                         const CFX_WideStringC& wsExpression,
+                         const WideStringView& wsExpression,
                          XFA_RESOLVENODE_RS& resolveNodeRS,
                          uint32_t dwStyles = XFA_RESOLVENODE_Children,
                          CXFA_Node* bindNode = nullptr);
@@ -46,7 +46,7 @@ class CXFA_ScriptContext {
 
   int32_t GetIndexByName(CXFA_Node* refNode);
   int32_t GetIndexByClassName(CXFA_Node* refNode);
-  void GetSomExpression(CXFA_Node* refNode, CFX_WideString& wsExpression);
+  void GetSomExpression(CXFA_Node* refNode, WideString& wsExpression);
 
   void SetNodesOfRunScript(std::vector<CXFA_Node*>* pArray);
   void AddNodesOfRunScript(const std::vector<CXFA_Node*>& nodes);
@@ -56,36 +56,36 @@ class CXFA_ScriptContext {
   void SetRunAtType(XFA_ATTRIBUTEENUM eRunAt) { m_eRunAtType = eRunAt; }
   bool IsRunAtClient() { return m_eRunAtType != XFA_ATTRIBUTEENUM_Server; }
   bool QueryNodeByFlag(CXFA_Node* refNode,
-                       const CFX_WideStringC& propname,
+                       const WideStringView& propname,
                        CFXJSE_Value* pValue,
                        uint32_t dwFlag,
                        bool bSetting);
   bool QueryVariableValue(CXFA_Node* pScriptNode,
-                          const CFX_ByteStringC& szPropName,
+                          const ByteStringView& szPropName,
                           CFXJSE_Value* pValue,
                           bool bGetter);
-  bool QueryBuiltinValue(const CFX_ByteStringC& szPropName,
+  bool QueryBuiltinValue(const ByteStringView& szPropName,
                          CFXJSE_Value* pValue);
   static void GlobalPropertyGetter(CFXJSE_Value* pObject,
-                                   const CFX_ByteStringC& szPropName,
+                                   const ByteStringView& szPropName,
                                    CFXJSE_Value* pValue);
   static void GlobalPropertySetter(CFXJSE_Value* pObject,
-                                   const CFX_ByteStringC& szPropName,
+                                   const ByteStringView& szPropName,
                                    CFXJSE_Value* pValue);
   static void NormalPropertyGetter(CFXJSE_Value* pObject,
-                                   const CFX_ByteStringC& szPropName,
+                                   const ByteStringView& szPropName,
                                    CFXJSE_Value* pValue);
   static void NormalPropertySetter(CFXJSE_Value* pObject,
-                                   const CFX_ByteStringC& szPropName,
+                                   const ByteStringView& szPropName,
                                    CFXJSE_Value* pValue);
   static void NormalMethodCall(CFXJSE_Value* hThis,
-                               const CFX_ByteStringC& szFuncName,
+                               const ByteStringView& szFuncName,
                                CFXJSE_Arguments& args);
   static int32_t NormalPropTypeGetter(CFXJSE_Value* pObject,
-                                      const CFX_ByteStringC& szPropName,
+                                      const ByteStringView& szPropName,
                                       bool bQueryIn);
   static int32_t GlobalPropTypeGetter(CFXJSE_Value* pObject,
-                                      const CFX_ByteStringC& szPropName,
+                                      const ByteStringView& szPropName,
                                       bool bQueryIn);
   bool RunVariablesScript(CXFA_Node* pScriptNode);
   CXFA_Object* GetVariablesThis(CXFA_Object* pObject, bool bScriptNode = false);
diff --git a/xfa/fxfa/parser/cxfa_simple_parser.cpp b/xfa/fxfa/parser/cxfa_simple_parser.cpp
index dd72f40d56..5b58761712 100644
--- a/xfa/fxfa/parser/cxfa_simple_parser.cpp
+++ b/xfa/fxfa/parser/cxfa_simple_parser.cpp
@@ -57,25 +57,25 @@ CFX_XMLNode* GetDocumentNode(CFX_XMLDoc* pXMLDoc,
   return nullptr;
 }
 
-CFX_WideString GetElementTagNamespaceURI(CFX_XMLElement* pElement) {
-  CFX_WideString wsNodeStr = pElement->GetNamespacePrefix();
-  CFX_WideString wsNamespaceURI;
+WideString GetElementTagNamespaceURI(CFX_XMLElement* pElement) {
+  WideString wsNodeStr = pElement->GetNamespacePrefix();
+  WideString wsNamespaceURI;
   if (!XFA_FDEExtension_ResolveNamespaceQualifier(
-          pElement, wsNodeStr.AsStringC(), &wsNamespaceURI)) {
-    return CFX_WideString();
+          pElement, wsNodeStr.AsStringView(), &wsNamespaceURI)) {
+    return WideString();
   }
   return wsNamespaceURI;
 }
 
 bool MatchNodeName(CFX_XMLNode* pNode,
-                   const CFX_WideStringC& wsLocalTagName,
-                   const CFX_WideStringC& wsNamespaceURIPrefix,
+                   const WideStringView& wsLocalTagName,
+                   const WideStringView& wsNamespaceURIPrefix,
                    uint32_t eMatchFlags = XFA_XDPPACKET_FLAGS_NOMATCH) {
   if (!pNode || pNode->GetType() != FX_XMLNODE_Element)
     return false;
 
   CFX_XMLElement* pElement = reinterpret_cast<CFX_XMLElement*>(pNode);
-  CFX_WideString wsNodeStr = pElement->GetLocalTagName();
+  WideString wsNodeStr = pElement->GetLocalTagName();
   if (wsNodeStr != wsLocalTagName)
     return false;
 
@@ -90,9 +90,9 @@ bool MatchNodeName(CFX_XMLNode* pNode,
   return wsNodeStr == wsNamespaceURIPrefix;
 }
 
-bool GetAttributeLocalName(const CFX_WideStringC& wsAttributeName,
-                           CFX_WideString& wsLocalAttrName) {
-  CFX_WideString wsAttrName(wsAttributeName);
+bool GetAttributeLocalName(const WideStringView& wsAttributeName,
+                           WideString& wsLocalAttrName) {
+  WideString wsAttrName(wsAttributeName);
   auto pos = wsAttrName.Find(L':', 0);
   if (!pos.has_value()) {
     wsLocalAttrName = wsAttrName;
@@ -103,11 +103,11 @@ bool GetAttributeLocalName(const CFX_WideStringC& wsAttributeName,
 }
 
 bool ResolveAttribute(CFX_XMLElement* pElement,
-                      const CFX_WideStringC& wsAttributeName,
-                      CFX_WideString& wsLocalAttrName,
-                      CFX_WideString& wsNamespaceURI) {
-  CFX_WideString wsAttrName(wsAttributeName);
-  CFX_WideString wsNSPrefix;
+                      const WideStringView& wsAttributeName,
+                      WideString& wsLocalAttrName,
+                      WideString& wsNamespaceURI) {
+  WideString wsAttrName(wsAttributeName);
+  WideString wsNSPrefix;
   if (GetAttributeLocalName(wsAttributeName, wsLocalAttrName)) {
     wsNSPrefix = wsAttrName.Left(wsAttributeName.GetLength() -
                                  wsLocalAttrName.GetLength() - 1);
@@ -117,7 +117,7 @@ bool ResolveAttribute(CFX_XMLElement* pElement,
     return false;
   }
   if (!XFA_FDEExtension_ResolveNamespaceQualifier(
-          pElement, wsNSPrefix.AsStringC(), &wsNamespaceURI)) {
+          pElement, wsNSPrefix.AsStringView(), &wsNamespaceURI)) {
     wsNamespaceURI.clear();
     return false;
   }
@@ -125,17 +125,17 @@ bool ResolveAttribute(CFX_XMLElement* pElement,
 }
 
 bool FindAttributeWithNS(CFX_XMLElement* pElement,
-                         const CFX_WideStringC& wsLocalAttributeName,
-                         const CFX_WideStringC& wsNamespaceURIPrefix,
-                         CFX_WideString& wsValue,
+                         const WideStringView& wsLocalAttributeName,
+                         const WideStringView& wsNamespaceURIPrefix,
+                         WideString& wsValue,
                          bool bMatchNSAsPrefix = false) {
   if (!pElement)
     return false;
 
-  CFX_WideString wsAttrNS;
+  WideString wsAttrNS;
   for (auto it : pElement->GetAttributes()) {
     auto pos = it.first.Find(L':', 0);
-    CFX_WideString wsNSPrefix;
+    WideString wsNSPrefix;
     if (!pos.has_value()) {
       if (wsLocalAttributeName != it.first)
         continue;
@@ -148,7 +148,7 @@ bool FindAttributeWithNS(CFX_XMLElement* pElement,
     }
 
     if (!XFA_FDEExtension_ResolveNamespaceQualifier(
-            pElement, wsNSPrefix.AsStringC(), &wsAttrNS)) {
+            pElement, wsNSPrefix.AsStringView(), &wsAttrNS)) {
       continue;
     }
     if (bMatchNSAsPrefix) {
@@ -194,20 +194,19 @@ CFX_XMLNode* GetDataSetsFromXDP(CFX_XMLNode* pXMLDocumentNode) {
   return nullptr;
 }
 
-bool IsStringAllWhitespace(CFX_WideString wsText) {
+bool IsStringAllWhitespace(WideString wsText) {
   wsText.TrimRight(L"\x20\x9\xD\xA");
   return wsText.IsEmpty();
 }
 
-void ConvertXMLToPlainText(CFX_XMLElement* pRootXMLNode,
-                           CFX_WideString& wsOutput) {
+void ConvertXMLToPlainText(CFX_XMLElement* pRootXMLNode, WideString& wsOutput) {
   for (CFX_XMLNode* pXMLChild =
            pRootXMLNode->GetNodeItem(CFX_XMLNode::FirstChild);
        pXMLChild;
        pXMLChild = pXMLChild->GetNodeItem(CFX_XMLNode::NextSibling)) {
     switch (pXMLChild->GetType()) {
       case FX_XMLNODE_Element: {
-        CFX_WideString wsTextData =
+        WideString wsTextData =
             static_cast<CFX_XMLElement*>(pXMLChild)->GetTextData();
         wsTextData += L"\n";
         wsOutput += wsTextData;
@@ -215,7 +214,7 @@ void ConvertXMLToPlainText(CFX_XMLElement* pRootXMLNode,
       }
       case FX_XMLNODE_Text:
       case FX_XMLNODE_CharData: {
-        CFX_WideString wsText = static_cast<CFX_XMLText*>(pXMLChild)->GetText();
+        WideString wsText = static_cast<CFX_XMLText*>(pXMLChild)->GetText();
         if (IsStringAllWhitespace(wsText))
           continue;
 
@@ -229,7 +228,7 @@ void ConvertXMLToPlainText(CFX_XMLElement* pRootXMLNode,
   }
 }
 
-const XFA_PACKETINFO* GetPacketByName(const CFX_WideStringC& wsName) {
+const XFA_PACKETINFO* GetPacketByName(const WideStringView& wsName) {
   if (wsName.IsEmpty())
     return nullptr;
 
@@ -315,7 +314,7 @@ int32_t CXFA_SimpleParser::DoParse() {
   return XFA_PARSESTATUS_Done;
 }
 
-CFX_XMLNode* CXFA_SimpleParser::ParseXMLData(const CFX_ByteString& wsXML) {
+CFX_XMLNode* CXFA_SimpleParser::ParseXMLData(const ByteString& wsXML) {
   CloseParser();
   m_pXMLDoc = pdfium::MakeUnique<CFX_XMLDoc>();
 
@@ -353,9 +352,9 @@ void CXFA_SimpleParser::ConstructXFANode(CXFA_Node* pXFANode,
             return;
 
           CFX_XMLElement* child = static_cast<CFX_XMLElement*>(pXMLChild);
-          CFX_WideString wsNodeStr = child->GetLocalTagName();
+          WideString wsNodeStr = child->GetLocalTagName();
           pXFAChild->SetCData(XFA_ATTRIBUTE_Name, wsNodeStr);
-          CFX_WideString wsChildValue;
+          WideString wsChildValue;
           XFA_GetPlainTextFromRichText(child, wsChildValue);
           if (!wsChildValue.IsEmpty())
             pXFAChild->SetCData(XFA_ATTRIBUTE_Value, wsChildValue);
@@ -388,13 +387,13 @@ CFX_XMLDoc* CXFA_SimpleParser::GetXMLDoc() const {
 
 bool XFA_FDEExtension_ResolveNamespaceQualifier(
     CFX_XMLElement* pNode,
-    const CFX_WideStringC& wsQualifier,
-    CFX_WideString* wsNamespaceURI) {
+    const WideStringView& wsQualifier,
+    WideString* wsNamespaceURI) {
   if (!pNode)
     return false;
 
   CFX_XMLNode* pFakeRoot = pNode->GetNodeItem(CFX_XMLNode::Root);
-  CFX_WideString wsNSAttribute;
+  WideString wsNSAttribute;
   bool bRet = false;
   if (wsQualifier.IsEmpty()) {
     wsNSAttribute = L"xmlns";
@@ -503,9 +502,9 @@ CXFA_Node* CXFA_SimpleParser::ParseAsXDPPacket_XDP(
       continue;
 
     CFX_XMLElement* pElement = reinterpret_cast<CFX_XMLElement*>(pChildItem);
-    CFX_WideString wsPacketName = pElement->GetLocalTagName();
+    WideString wsPacketName = pElement->GetLocalTagName();
     const XFA_PACKETINFO* pPacketInfo =
-        GetPacketByName(wsPacketName.AsStringC());
+        GetPacketByName(wsPacketName.AsStringView());
     if (pPacketInfo && pPacketInfo->pURI) {
       if (!MatchNodeName(pElement, pPacketInfo->pName, pPacketInfo->pURI,
                          pPacketInfo->eFlags)) {
@@ -612,7 +611,7 @@ CXFA_Node* CXFA_SimpleParser::ParseAsXDPPacket_TemplateForm(
       if (m_bDocumentParser) {
         CFX_XMLElement* pXMLDocumentElement =
             static_cast<CFX_XMLElement*>(pXMLDocumentNode);
-        CFX_WideString wsNamespaceURI = pXMLDocumentElement->GetNamespaceURI();
+        WideString wsNamespaceURI = pXMLDocumentElement->GetNamespaceURI();
         if (wsNamespaceURI.IsEmpty())
           wsNamespaceURI = pXMLDocumentElement->GetString(L"xmlns:xfa");
 
@@ -628,7 +627,7 @@ CXFA_Node* CXFA_SimpleParser::ParseAsXDPPacket_TemplateForm(
                       XFA_GetPacketByIndex(XFA_PACKET_Form)->eFlags)) {
       CFX_XMLElement* pXMLDocumentElement =
           static_cast<CFX_XMLElement*>(pXMLDocumentNode);
-      CFX_WideString wsChecksum = pXMLDocumentElement->GetString(L"checksum");
+      WideString wsChecksum = pXMLDocumentElement->GetString(L"checksum");
       if (wsChecksum.GetLength() != 28 ||
           m_pXMLParser->m_dwCheckStatus != 0x03) {
         return nullptr;
@@ -641,7 +640,7 @@ CXFA_Node* CXFA_SimpleParser::ParseAsXDPPacket_TemplateForm(
       pChecksum->UpdateChecksum(m_pFileRead, m_pXMLParser->m_nStart[1],
                                 m_pXMLParser->m_nSize[1]);
       pChecksum->FinishChecksum();
-      CFX_ByteString bsCheck = pChecksum->GetChecksum();
+      ByteString bsCheck = pChecksum->GetChecksum();
       if (bsCheck != wsChecksum.UTF8Encode())
         return nullptr;
 
@@ -651,7 +650,7 @@ CXFA_Node* CXFA_SimpleParser::ParseAsXDPPacket_TemplateForm(
 
       pNode->SetCData(XFA_ATTRIBUTE_Name,
                       XFA_GetPacketByIndex(XFA_PACKET_Form)->pName);
-      pNode->SetAttribute(XFA_ATTRIBUTE_Checksum, wsChecksum.AsStringC());
+      pNode->SetAttribute(XFA_ATTRIBUTE_Checksum, wsChecksum.AsStringView());
       CXFA_Node* pTemplateRoot =
           m_pRootNode->GetFirstChildByClass(XFA_Element::Template);
       CXFA_Node* pTemplateChosen =
@@ -724,7 +723,7 @@ CXFA_Node* CXFA_SimpleParser::ParseAsXDPPacket_Data(
         delete pDataXMLNode;
       return nullptr;
     }
-    CFX_WideString wsLocalName =
+    WideString wsLocalName =
         static_cast<CFX_XMLElement*>(pDataXMLNode)->GetLocalTagName();
     pNode->SetCData(XFA_ATTRIBUTE_Name, wsLocalName);
     if (!DataLoader(pNode, pDataXMLNode, true))
@@ -821,7 +820,7 @@ CXFA_Node* CXFA_SimpleParser::ParseAsXDPPacket_User(
   if (!pNode)
     return nullptr;
 
-  CFX_WideString wsName =
+  WideString wsName =
       static_cast<CFX_XMLElement*>(pXMLDocumentNode)->GetLocalTagName();
   pNode->SetCData(XFA_ATTRIBUTE_Name, wsName);
   if (!UserPacketLoader(pNode, pXMLDocumentNode))
@@ -854,8 +853,8 @@ CXFA_Node* CXFA_SimpleParser::NormalLoader(CXFA_Node* pXFANode,
     switch (pXMLChild->GetType()) {
       case FX_XMLNODE_Element: {
         CFX_XMLElement* pXMLElement = static_cast<CFX_XMLElement*>(pXMLChild);
-        CFX_WideString wsTagName = pXMLElement->GetLocalTagName();
-        XFA_Element eType = XFA_GetElementTypeForName(wsTagName.AsStringC());
+        WideString wsTagName = pXMLElement->GetLocalTagName();
+        XFA_Element eType = XFA_GetElementTypeForName(wsTagName.AsStringView());
         if (eType == XFA_Element::Unknown)
           continue;
 
@@ -873,17 +872,17 @@ CXFA_Node* CXFA_SimpleParser::NormalLoader(CXFA_Node* pXFANode,
         if (!pXFAChild)
           return nullptr;
         if (ePacketID == XFA_XDPPACKET_Config)
-          pXFAChild->SetAttribute(XFA_ATTRIBUTE_Name, wsTagName.AsStringC());
+          pXFAChild->SetAttribute(XFA_ATTRIBUTE_Name, wsTagName.AsStringView());
 
         bool IsNeedValue = true;
         for (auto it : pXMLElement->GetAttributes()) {
-          CFX_WideString wsAttrName;
-          GetAttributeLocalName(it.first.AsStringC(), wsAttrName);
+          WideString wsAttrName;
+          GetAttributeLocalName(it.first.AsStringView(), wsAttrName);
           if (wsAttrName == L"nil" && it.second == L"true")
             IsNeedValue = false;
 
           const XFA_ATTRIBUTEINFO* lpAttrInfo =
-              XFA_GetAttributeByName(wsAttrName.AsStringC());
+              XFA_GetAttributeByName(wsAttrName.AsStringView());
           if (!lpAttrInfo)
             continue;
 
@@ -891,7 +890,7 @@ CXFA_Node* CXFA_SimpleParser::NormalLoader(CXFA_Node* pXFANode,
               lpAttrInfo->eName != XFA_ATTRIBUTE_Save) {
             continue;
           }
-          pXFAChild->SetAttribute(lpAttrInfo->eName, it.second.AsStringC());
+          pXFAChild->SetAttribute(lpAttrInfo->eName, it.second.AsStringView());
         }
         pXFANode->InsertChild(pXFAChild);
         if (eType == XFA_Element::Validate || eType == XFA_Element::Locale) {
@@ -931,7 +930,7 @@ void CXFA_SimpleParser::ParseContentNode(CXFA_Node* pXFANode,
                                          XFA_XDPPACKET ePacketID) {
   XFA_Element element = XFA_Element::Sharptext;
   if (pXFANode->GetElementType() == XFA_Element::ExData) {
-    CFX_WideStringC wsContentType =
+    WideStringView wsContentType =
         pXFANode->GetCData(XFA_ATTRIBUTE_ContentType);
     if (wsContentType == L"text/html")
       element = XFA_Element::SharpxHTML;
@@ -941,7 +940,7 @@ void CXFA_SimpleParser::ParseContentNode(CXFA_Node* pXFANode,
   if (element == XFA_Element::SharpxHTML)
     pXFANode->SetXMLMappingNode(pXMLNode);
 
-  CFX_WideString wsValue;
+  WideString wsValue;
   for (CFX_XMLNode* pXMLChild = pXMLNode->GetNodeItem(CFX_XMLNode::FirstChild);
        pXMLChild;
        pXMLChild = pXMLChild->GetNodeItem(CFX_XMLNode::NextSibling)) {
@@ -992,8 +991,7 @@ void CXFA_SimpleParser::ParseDataGroup(CXFA_Node* pXFANode,
       case FX_XMLNODE_Element: {
         CFX_XMLElement* pXMLElement = static_cast<CFX_XMLElement*>(pXMLChild);
         {
-          CFX_WideString wsNamespaceURI =
-              GetElementTagNamespaceURI(pXMLElement);
+          WideString wsNamespaceURI = GetElementTagNamespaceURI(pXMLElement);
           if (wsNamespaceURI == L"http://www.xfa.com/schema/xfa-package/" ||
               wsNamespaceURI == L"http://www.xfa.org/schema/xfa-package/" ||
               wsNamespaceURI == L"http://www.w3.org/2001/XMLSchema-instance") {
@@ -1003,7 +1001,7 @@ void CXFA_SimpleParser::ParseDataGroup(CXFA_Node* pXFANode,
 
         XFA_Element eNodeType = XFA_Element::DataModel;
         if (eNodeType == XFA_Element::DataModel) {
-          CFX_WideString wsDataNodeAttr;
+          WideString wsDataNodeAttr;
           if (FindAttributeWithNS(pXMLElement, L"dataNode",
                                   L"http://www.xfa.org/schema/xfa-data/1.0/",
                                   wsDataNodeAttr)) {
@@ -1013,7 +1011,7 @@ void CXFA_SimpleParser::ParseDataGroup(CXFA_Node* pXFANode,
               eNodeType = XFA_Element::DataValue;
           }
         }
-        CFX_WideString wsContentType;
+        WideString wsContentType;
         if (eNodeType == XFA_Element::DataModel) {
           if (FindAttributeWithNS(pXMLElement, L"contentType",
                                   L"http://www.xfa.org/schema/xfa-data/1.0/",
@@ -1048,9 +1046,9 @@ void CXFA_SimpleParser::ParseDataGroup(CXFA_Node* pXFANode,
         bool bNeedValue = true;
 
         for (auto it : pXMLElement->GetAttributes()) {
-          CFX_WideString wsName;
-          CFX_WideString wsNS;
-          if (!ResolveAttribute(pXMLElement, it.first.AsStringC(), wsName,
+          WideString wsName;
+          WideString wsNS;
+          if (!ResolveAttribute(pXMLElement, it.first.AsStringView(), wsName,
                                 wsNS)) {
             continue;
           }
@@ -1080,7 +1078,7 @@ void CXFA_SimpleParser::ParseDataGroup(CXFA_Node* pXFANode,
         }
 
         if (!bNeedValue) {
-          CFX_WideString wsNilName(L"xsi:nil");
+          WideString wsNilName(L"xsi:nil");
           pXMLElement->RemoveAttribute(wsNilName.c_str());
         }
         pXFANode->InsertChild(pXFAChild);
@@ -1096,7 +1094,7 @@ void CXFA_SimpleParser::ParseDataGroup(CXFA_Node* pXFANode,
       case FX_XMLNODE_CharData:
       case FX_XMLNODE_Text: {
         CFX_XMLText* pXMLText = static_cast<CFX_XMLText*>(pXMLChild);
-        CFX_WideString wsText = pXMLText->GetText();
+        WideString wsText = pXMLText->GetText();
         if (IsStringAllWhitespace(wsText))
           continue;
 
@@ -1131,7 +1129,7 @@ void CXFA_SimpleParser::ParseDataValue(CXFA_Node* pXFANode,
     if (eNodeType == FX_XMLNODE_Instruction)
       continue;
 
-    CFX_WideString wsText;
+    WideString wsText;
     if (eNodeType == FX_XMLNODE_Text || eNodeType == FX_XMLNODE_CharData) {
       wsText = static_cast<CFX_XMLText*>(pXMLChild)->GetText();
       if (!pXMLCurValueNode)
@@ -1148,7 +1146,7 @@ void CXFA_SimpleParser::ParseDataValue(CXFA_Node* pXFANode,
     } else {
       bMarkAsCompound = true;
       if (pXMLCurValueNode) {
-        CFX_WideString wsCurValue = wsCurValueTextBuf.MakeString();
+        WideString wsCurValue = wsCurValueTextBuf.MakeString();
         if (!wsCurValue.IsEmpty()) {
           CXFA_Node* pXFAChild =
               m_pFactory->CreateNode(ePacketID, XFA_Element::DataValue);
@@ -1170,19 +1168,19 @@ void CXFA_SimpleParser::ParseDataValue(CXFA_Node* pXFANode,
       if (!pXFAChild)
         return;
 
-      CFX_WideString wsNodeStr =
+      WideString wsNodeStr =
           static_cast<CFX_XMLElement*>(pXMLChild)->GetLocalTagName();
       pXFAChild->SetCData(XFA_ATTRIBUTE_Name, wsNodeStr);
       ParseDataValue(pXFAChild, pXMLChild, ePacketID);
       pXFANode->InsertChild(pXFAChild);
       pXFAChild->SetXMLMappingNode(pXMLChild);
       pXFAChild->SetFlag(XFA_NodeFlag_Initialized, false);
-      CFX_WideStringC wsCurValue = pXFAChild->GetCData(XFA_ATTRIBUTE_Value);
+      WideStringView wsCurValue = pXFAChild->GetCData(XFA_ATTRIBUTE_Value);
       wsValueTextBuf << wsCurValue;
     }
   }
   if (pXMLCurValueNode) {
-    CFX_WideString wsCurValue = wsCurValueTextBuf.MakeString();
+    WideString wsCurValue = wsCurValueTextBuf.MakeString();
     if (!wsCurValue.IsEmpty()) {
       if (bMarkAsCompound) {
         CXFA_Node* pXFAChild =
@@ -1201,7 +1199,7 @@ void CXFA_SimpleParser::ParseDataValue(CXFA_Node* pXFANode,
     }
     pXMLCurValueNode = nullptr;
   }
-  CFX_WideString wsNodeValue = wsValueTextBuf.MakeString();
+  WideString wsNodeValue = wsValueTextBuf.MakeString();
   pXFANode->SetCData(XFA_ATTRIBUTE_Value, wsNodeValue);
 }
 
@@ -1211,9 +1209,8 @@ void CXFA_SimpleParser::ParseInstruction(CXFA_Node* pXFANode,
   if (!m_bDocumentParser)
     return;
 
-  CFX_WideString wsTargetName = pXMLInstruction->GetName();
-  const std::vector<CFX_WideString>& target_data =
-      pXMLInstruction->GetTargetData();
+  WideString wsTargetName = pXMLInstruction->GetName();
+  const std::vector<WideString>& target_data = pXMLInstruction->GetTargetData();
   if (wsTargetName == L"originalXFAVersion") {
     if (target_data.size() > 1 &&
         (pXFANode->GetDocument()->RecognizeXFAVersionNumber(target_data[0]) !=
diff --git a/xfa/fxfa/parser/cxfa_simple_parser.h b/xfa/fxfa/parser/cxfa_simple_parser.h
index 705b6bde5c..91bfb054b5 100644
--- a/xfa/fxfa/parser/cxfa_simple_parser.h
+++ b/xfa/fxfa/parser/cxfa_simple_parser.h
@@ -28,7 +28,7 @@ class CXFA_SimpleParser {
   int32_t StartParse(const CFX_RetainPtr<IFX_SeekableStream>& pStream,
                      XFA_XDPPACKET ePacketID);
   int32_t DoParse();
-  CFX_XMLNode* ParseXMLData(const CFX_ByteString& wsXML);
+  CFX_XMLNode* ParseXMLData(const ByteString& wsXML);
   void ConstructXFANode(CXFA_Node* pXFANode, CFX_XMLNode* pXMLNode);
   CXFA_Node* GetRootNode() const;
   CFX_XMLDoc* GetXMLDoc() const;
diff --git a/xfa/fxfa/parser/cxfa_stroke.cpp b/xfa/fxfa/parser/cxfa_stroke.cpp
index e81c0ce591..f1319340a0 100644
--- a/xfa/fxfa/parser/cxfa_stroke.cpp
+++ b/xfa/fxfa/parser/cxfa_stroke.cpp
@@ -52,7 +52,7 @@ FX_ARGB CXFA_Stroke::GetColor() const {
   if (!pNode)
     return 0xFF000000;
 
-  CFX_WideStringC wsColor;
+  WideStringView wsColor;
   pNode->TryCData(XFA_ATTRIBUTE_Value, wsColor);
   return CXFA_Data::ToColor(wsColor);
 }
@@ -62,7 +62,7 @@ void CXFA_Stroke::SetColor(FX_ARGB argb) {
     return;
 
   CXFA_Node* pNode = m_pNode->GetProperty(0, XFA_Element::Color);
-  CFX_WideString wsColor;
+  WideString wsColor;
   int a;
   int r;
   int g;
diff --git a/xfa/fxfa/parser/cxfa_submit.cpp b/xfa/fxfa/parser/cxfa_submit.cpp
index e390e6314b..7fb04a3c64 100644
--- a/xfa/fxfa/parser/cxfa_submit.cpp
+++ b/xfa/fxfa/parser/cxfa_submit.cpp
@@ -18,10 +18,10 @@ int32_t CXFA_Submit::GetSubmitFormat() {
   return m_pNode->GetEnum(XFA_ATTRIBUTE_Format);
 }
 
-void CXFA_Submit::GetSubmitTarget(CFX_WideStringC& wsTarget) {
+void CXFA_Submit::GetSubmitTarget(WideStringView& wsTarget) {
   m_pNode->TryCData(XFA_ATTRIBUTE_Target, wsTarget);
 }
 
-void CXFA_Submit::GetSubmitXDPContent(CFX_WideStringC& wsContent) {
+void CXFA_Submit::GetSubmitXDPContent(WideStringView& wsContent) {
   m_pNode->TryCData(XFA_ATTRIBUTE_XdpContent, wsContent);
 }
diff --git a/xfa/fxfa/parser/cxfa_submit.h b/xfa/fxfa/parser/cxfa_submit.h
index f10435e1f5..9d4d7fe281 100644
--- a/xfa/fxfa/parser/cxfa_submit.h
+++ b/xfa/fxfa/parser/cxfa_submit.h
@@ -19,8 +19,8 @@ class CXFA_Submit : public CXFA_Data {
 
   bool IsSubmitEmbedPDF();
   int32_t GetSubmitFormat();
-  void GetSubmitTarget(CFX_WideStringC& wsTarget);
-  void GetSubmitXDPContent(CFX_WideStringC& wsContent);
+  void GetSubmitTarget(WideStringView& wsTarget);
+  void GetSubmitXDPContent(WideStringView& wsContent);
 };
 
 #endif  // XFA_FXFA_PARSER_CXFA_SUBMIT_H_
diff --git a/xfa/fxfa/parser/cxfa_text.cpp b/xfa/fxfa/parser/cxfa_text.cpp
index 192a4deac4..cab11a6892 100644
--- a/xfa/fxfa/parser/cxfa_text.cpp
+++ b/xfa/fxfa/parser/cxfa_text.cpp
@@ -10,6 +10,6 @@
 
 CXFA_Text::CXFA_Text(CXFA_Node* pNode) : CXFA_Data(pNode) {}
 
-void CXFA_Text::GetContent(CFX_WideString& wsText) {
+void CXFA_Text::GetContent(WideString& wsText) {
   m_pNode->TryContent(wsText);
 }
diff --git a/xfa/fxfa/parser/cxfa_text.h b/xfa/fxfa/parser/cxfa_text.h
index ca41c0dbb4..18b5628482 100644
--- a/xfa/fxfa/parser/cxfa_text.h
+++ b/xfa/fxfa/parser/cxfa_text.h
@@ -16,7 +16,7 @@ class CXFA_Text : public CXFA_Data {
  public:
   explicit CXFA_Text(CXFA_Node* pNode);
 
-  void GetContent(CFX_WideString& wsText);
+  void GetContent(WideString& wsText);
 };
 
 #endif  // XFA_FXFA_PARSER_CXFA_TEXT_H_
diff --git a/xfa/fxfa/parser/cxfa_thisproxy.cpp b/xfa/fxfa/parser/cxfa_thisproxy.cpp
index 2938c1fb3f..55e676ecdc 100644
--- a/xfa/fxfa/parser/cxfa_thisproxy.cpp
+++ b/xfa/fxfa/parser/cxfa_thisproxy.cpp
@@ -12,7 +12,7 @@ CXFA_ThisProxy::CXFA_ThisProxy(CXFA_Node* pThisNode, CXFA_Node* pScriptNode)
     : CXFA_Object(pThisNode->GetDocument(),
                   XFA_ObjectType::VariablesThis,
                   XFA_Element::Unknown,
-                  CFX_WideStringC()),
+                  WideStringView()),
       m_pThisNode(nullptr),
       m_pScriptNode(nullptr) {
   m_pThisNode = pThisNode;
diff --git a/xfa/fxfa/parser/cxfa_tooltip.cpp b/xfa/fxfa/parser/cxfa_tooltip.cpp
index f3de7aa591..9561ef2ac5 100644
--- a/xfa/fxfa/parser/cxfa_tooltip.cpp
+++ b/xfa/fxfa/parser/cxfa_tooltip.cpp
@@ -10,6 +10,6 @@
 
 CXFA_ToolTip::CXFA_ToolTip(CXFA_Node* pNode) : CXFA_Data(pNode) {}
 
-bool CXFA_ToolTip::GetTip(CFX_WideString& wsTip) {
+bool CXFA_ToolTip::GetTip(WideString& wsTip) {
   return m_pNode->TryContent(wsTip);
 }
diff --git a/xfa/fxfa/parser/cxfa_tooltip.h b/xfa/fxfa/parser/cxfa_tooltip.h
index 433885d89c..cc4bc31841 100644
--- a/xfa/fxfa/parser/cxfa_tooltip.h
+++ b/xfa/fxfa/parser/cxfa_tooltip.h
@@ -16,7 +16,7 @@ class CXFA_ToolTip : public CXFA_Data {
  public:
   explicit CXFA_ToolTip(CXFA_Node* pNode);
 
-  bool GetTip(CFX_WideString& wsTip);
+  bool GetTip(WideString& wsTip);
 };
 
 #endif  // XFA_FXFA_PARSER_CXFA_TOOLTIP_H_
diff --git a/xfa/fxfa/parser/cxfa_validate.cpp b/xfa/fxfa/parser/cxfa_validate.cpp
index 712d0f2829..fc472741a9 100644
--- a/xfa/fxfa/parser/cxfa_validate.cpp
+++ b/xfa/fxfa/parser/cxfa_validate.cpp
@@ -16,10 +16,10 @@ int32_t CXFA_Validate::GetFormatTest() {
 }
 
 bool CXFA_Validate::SetTestValue(int32_t iType,
-                                 CFX_WideString& wsValue,
+                                 WideString& wsValue,
                                  XFA_ATTRIBUTEENUM eName) {
   const XFA_ATTRIBUTEENUMINFO* pInfo =
-      XFA_GetAttributeEnumByName(wsValue.AsStringC());
+      XFA_GetAttributeEnumByName(wsValue.AsStringView());
   if (pInfo)
     eName = pInfo->eName;
 
@@ -27,7 +27,7 @@ bool CXFA_Validate::SetTestValue(int32_t iType,
   return true;
 }
 
-bool CXFA_Validate::SetNullTest(CFX_WideString wsValue) {
+bool CXFA_Validate::SetNullTest(WideString wsValue) {
   return SetTestValue(XFA_ATTRIBUTE_NullTest, wsValue,
                       XFA_ATTRIBUTEENUM_Disabled);
 }
@@ -40,8 +40,8 @@ int32_t CXFA_Validate::GetScriptTest() {
   return m_pNode->GetEnum(XFA_ATTRIBUTE_ScriptTest);
 }
 
-void CXFA_Validate::GetMessageText(CFX_WideString& wsMessage,
-                                   const CFX_WideString& wsMessageType) {
+void CXFA_Validate::GetMessageText(WideString& wsMessage,
+                                   const WideString& wsMessageType) {
   CXFA_Node* pNode = m_pNode->GetProperty(0, XFA_Element::Message, false);
   if (!pNode)
     return;
@@ -52,7 +52,7 @@ void CXFA_Validate::GetMessageText(CFX_WideString& wsMessage,
     if (pItemNode->GetElementType() != XFA_Element::Text)
       continue;
 
-    CFX_WideStringC wsName;
+    WideStringView wsName;
     pItemNode->TryCData(XFA_ATTRIBUTE_Name, wsName);
     if (wsName.IsEmpty() || wsName == wsMessageType) {
       pItemNode->TryContent(wsMessage);
@@ -61,24 +61,24 @@ void CXFA_Validate::GetMessageText(CFX_WideString& wsMessage,
   }
 }
 
-void CXFA_Validate::SetFormatMessageText(CFX_WideString wsMessage) {
+void CXFA_Validate::SetFormatMessageText(WideString wsMessage) {
   SetMessageText(wsMessage, L"formatTest");
 }
 
-void CXFA_Validate::GetFormatMessageText(CFX_WideString& wsMessage) {
+void CXFA_Validate::GetFormatMessageText(WideString& wsMessage) {
   GetMessageText(wsMessage, L"formatTest");
 }
 
-void CXFA_Validate::SetNullMessageText(CFX_WideString wsMessage) {
+void CXFA_Validate::SetNullMessageText(WideString wsMessage) {
   SetMessageText(wsMessage, L"nullTest");
 }
 
-void CXFA_Validate::GetNullMessageText(CFX_WideString& wsMessage) {
+void CXFA_Validate::GetNullMessageText(WideString& wsMessage) {
   GetMessageText(wsMessage, L"nullTest");
 }
 
-void CXFA_Validate::SetMessageText(CFX_WideString& wsMessage,
-                                   const CFX_WideString& wsMessageType) {
+void CXFA_Validate::SetMessageText(WideString& wsMessage,
+                                   const WideString& wsMessageType) {
   CXFA_Node* pNode = m_pNode->GetProperty(0, XFA_Element::Message, true);
   if (!pNode)
     return;
@@ -89,7 +89,7 @@ void CXFA_Validate::SetMessageText(CFX_WideString& wsMessage,
     if (pItemNode->GetElementType() != XFA_Element::Text)
       continue;
 
-    CFX_WideStringC wsName;
+    WideStringView wsName;
     pItemNode->TryCData(XFA_ATTRIBUTE_Name, wsName);
     if (wsName.IsEmpty() || wsName == wsMessageType) {
       pItemNode->SetContent(wsMessage, wsMessage, false);
@@ -102,15 +102,15 @@ void CXFA_Validate::SetMessageText(CFX_WideString& wsMessage,
   pTextNode->SetContent(wsMessage, wsMessage, false);
 }
 
-void CXFA_Validate::GetScriptMessageText(CFX_WideString& wsMessage) {
+void CXFA_Validate::GetScriptMessageText(WideString& wsMessage) {
   GetMessageText(wsMessage, L"scriptTest");
 }
 
-void CXFA_Validate::SetScriptMessageText(CFX_WideString wsMessage) {
+void CXFA_Validate::SetScriptMessageText(WideString wsMessage) {
   SetMessageText(wsMessage, L"scriptTest");
 }
 
-void CXFA_Validate::GetPicture(CFX_WideString& wsPicture) {
+void CXFA_Validate::GetPicture(WideString& wsPicture) {
   if (CXFA_Node* pNode = m_pNode->GetChild(0, XFA_Element::Picture))
     pNode->TryContent(wsPicture);
 }
diff --git a/xfa/fxfa/parser/cxfa_validate.h b/xfa/fxfa/parser/cxfa_validate.h
index 470cefe773..ce4ba647cc 100644
--- a/xfa/fxfa/parser/cxfa_validate.h
+++ b/xfa/fxfa/parser/cxfa_validate.h
@@ -20,24 +20,22 @@ class CXFA_Validate : public CXFA_Data {
 
   int32_t GetFormatTest();
   int32_t GetNullTest();
-  bool SetNullTest(CFX_WideString wsValue);
+  bool SetNullTest(WideString wsValue);
   int32_t GetScriptTest();
-  void GetFormatMessageText(CFX_WideString& wsMessage);
-  void SetFormatMessageText(CFX_WideString wsMessage);
-  void GetNullMessageText(CFX_WideString& wsMessage);
-  void SetNullMessageText(CFX_WideString wsMessage);
-  void GetScriptMessageText(CFX_WideString& wsMessage);
-  void SetScriptMessageText(CFX_WideString wsMessage);
-  void GetPicture(CFX_WideString& wsPicture);
+  void GetFormatMessageText(WideString& wsMessage);
+  void SetFormatMessageText(WideString wsMessage);
+  void GetNullMessageText(WideString& wsMessage);
+  void SetNullMessageText(WideString wsMessage);
+  void GetScriptMessageText(WideString& wsMessage);
+  void SetScriptMessageText(WideString wsMessage);
+  void GetPicture(WideString& wsPicture);
   CXFA_Script GetScript();
 
  private:
-  void GetMessageText(CFX_WideString& wsMessage,
-                      const CFX_WideString& wsMessageType);
-  void SetMessageText(CFX_WideString& wsMessage,
-                      const CFX_WideString& wsMessageType);
+  void GetMessageText(WideString& wsMessage, const WideString& wsMessageType);
+  void SetMessageText(WideString& wsMessage, const WideString& wsMessageType);
   bool SetTestValue(int32_t iType,
-                    CFX_WideString& wsValue,
+                    WideString& wsValue,
                     XFA_ATTRIBUTEENUM eName);
 };
 
diff --git a/xfa/fxfa/parser/cxfa_value.cpp b/xfa/fxfa/parser/cxfa_value.cpp
index 4f166d5d42..abf55da260 100644
--- a/xfa/fxfa/parser/cxfa_value.cpp
+++ b/xfa/fxfa/parser/cxfa_value.cpp
@@ -16,7 +16,7 @@ XFA_Element CXFA_Value::GetChildValueClassID() {
   return XFA_Element::Unknown;
 }
 
-bool CXFA_Value::GetChildValueContent(CFX_WideString& wsContent) {
+bool CXFA_Value::GetChildValueContent(WideString& wsContent) {
   if (!m_pNode)
     return false;
   if (CXFA_Node* pNode = m_pNode->GetNodeItem(XFA_NODEITEM_FirstChild))
diff --git a/xfa/fxfa/parser/cxfa_value.h b/xfa/fxfa/parser/cxfa_value.h
index 225e1879da..52df169ee4 100644
--- a/xfa/fxfa/parser/cxfa_value.h
+++ b/xfa/fxfa/parser/cxfa_value.h
@@ -23,7 +23,7 @@ class CXFA_Value : public CXFA_Data {
   explicit CXFA_Value(CXFA_Node* pNode) : CXFA_Data(pNode) {}
 
   XFA_Element GetChildValueClassID();
-  bool GetChildValueContent(CFX_WideString& wsContent);
+  bool GetChildValueContent(WideString& wsContent);
   CXFA_Arc GetArc();
   CXFA_Line GetLine();
   CXFA_Rectangle GetRectangle();
diff --git a/xfa/fxfa/parser/cxfa_widgetdata.cpp b/xfa/fxfa/parser/cxfa_widgetdata.cpp
index 80981d97d6..1879377ae4 100644
--- a/xfa/fxfa/parser/cxfa_widgetdata.cpp
+++ b/xfa/fxfa/parser/cxfa_widgetdata.cpp
@@ -34,9 +34,9 @@ float GetEdgeThickness(const std::vector<CXFA_Stroke>& strokes,
   return fThickness;
 }
 
-bool SplitDateTime(const CFX_WideString& wsDateTime,
-                   CFX_WideString& wsDate,
-                   CFX_WideString& wsTime) {
+bool SplitDateTime(const WideString& wsDateTime,
+                   WideString& wsDate,
+                   WideString& wsTime) {
   wsDate = L"";
   wsTime = L"";
   if (wsDateTime.IsEmpty())
@@ -208,9 +208,9 @@ XFA_ATTRIBUTEENUM GetAttributeDefaultValue_Enum(XFA_Element eElement,
   return XFA_ATTRIBUTEENUM_Unknown;
 }
 
-CFX_WideStringC GetAttributeDefaultValue_Cdata(XFA_Element eElement,
-                                               XFA_ATTRIBUTE eAttribute,
-                                               uint32_t dwPacket) {
+WideStringView GetAttributeDefaultValue_Cdata(XFA_Element eElement,
+                                              XFA_ATTRIBUTE eAttribute,
+                                              uint32_t dwPacket) {
   void* pValue;
   if (XFA_GetAttributeDefaultValue(pValue, eElement, eAttribute,
                                    XFA_ATTRIBUTETYPE_Cdata, dwPacket)) {
@@ -251,7 +251,7 @@ XFA_Element CXFA_WidgetData::GetUIType() {
   return m_eUIType;
 }
 
-CFX_WideString CXFA_WidgetData::GetRawValue() {
+WideString CXFA_WidgetData::GetRawValue() {
   return m_pNode->GetContent();
 }
 
@@ -309,13 +309,13 @@ std::vector<CXFA_Node*> CXFA_WidgetData::GetEventByActivity(int32_t iActivity,
     CXFA_Event event(pNode);
     if (event.GetActivity() == iActivity) {
       if (iActivity == XFA_ATTRIBUTEENUM_Ready) {
-        CFX_WideStringC wsRef;
+        WideStringView wsRef;
         event.GetRef(wsRef);
         if (bIsFormReady) {
-          if (wsRef == CFX_WideStringC(L"$form"))
+          if (wsRef == WideStringView(L"$form"))
             events.push_back(pNode);
         } else {
-          if (wsRef == CFX_WideStringC(L"$layout"))
+          if (wsRef == WideStringView(L"$layout"))
             events.push_back(pNode);
         }
       } else {
@@ -430,12 +430,12 @@ int32_t CXFA_WidgetData::GetButtonHighlight() {
       XFA_Element::Button, XFA_ATTRIBUTE_Highlight, XFA_XDPPACKET_Form);
 }
 
-bool CXFA_WidgetData::GetButtonRollover(CFX_WideString& wsRollover,
+bool CXFA_WidgetData::GetButtonRollover(WideString& wsRollover,
                                         bool& bRichText) {
   if (CXFA_Node* pItems = m_pNode->GetChild(0, XFA_Element::Items)) {
     CXFA_Node* pText = pItems->GetNodeItem(XFA_NODEITEM_FirstChild);
     while (pText) {
-      CFX_WideStringC wsName;
+      WideStringView wsName;
       pText->TryCData(XFA_ATTRIBUTE_Name, wsName);
       if (wsName == L"rollover") {
         pText->TryContent(wsRollover);
@@ -448,11 +448,11 @@ bool CXFA_WidgetData::GetButtonRollover(CFX_WideString& wsRollover,
   return false;
 }
 
-bool CXFA_WidgetData::GetButtonDown(CFX_WideString& wsDown, bool& bRichText) {
+bool CXFA_WidgetData::GetButtonDown(WideString& wsDown, bool& bRichText) {
   if (CXFA_Node* pItems = m_pNode->GetChild(0, XFA_Element::Items)) {
     CXFA_Node* pText = pItems->GetNodeItem(XFA_NODEITEM_FirstChild);
     while (pText) {
-      CFX_WideStringC wsName;
+      WideStringView wsName;
       pText->TryCData(XFA_ATTRIBUTE_Name, wsName);
       if (wsName == L"down") {
         pText->TryContent(wsDown);
@@ -505,7 +505,7 @@ bool CXFA_WidgetData::IsAllowNeutral() {
 }
 
 XFA_CHECKSTATE CXFA_WidgetData::GetCheckState() {
-  CFX_WideString wsValue = GetRawValue();
+  WideString wsValue = GetRawValue();
   if (wsValue.IsEmpty())
     return XFA_CHECKSTATE_Off;
 
@@ -513,7 +513,7 @@ XFA_CHECKSTATE CXFA_WidgetData::GetCheckState() {
     CXFA_Node* pText = pItems->GetNodeItem(XFA_NODEITEM_FirstChild);
     int32_t i = 0;
     while (pText) {
-      CFX_WideString wsContent;
+      WideString wsContent;
       if (pText->TryContent(wsContent) && (wsContent == wsValue))
         return (XFA_CHECKSTATE)i;
 
@@ -527,7 +527,7 @@ XFA_CHECKSTATE CXFA_WidgetData::GetCheckState() {
 void CXFA_WidgetData::SetCheckState(XFA_CHECKSTATE eCheckState, bool bNotify) {
   CXFA_WidgetData exclGroup(GetExclGroupNode());
   if (exclGroup) {
-    CFX_WideString wsValue;
+    WideString wsValue;
     if (eCheckState != XFA_CHECKSTATE_Off) {
       if (CXFA_Node* pItems = m_pNode->GetChild(0, XFA_Element::Items)) {
         CXFA_Node* pText = pItems->GetNodeItem(XFA_NODEITEM_FirstChild);
@@ -549,8 +549,8 @@ void CXFA_WidgetData::SetCheckState(XFA_CHECKSTATE eCheckState, bool bNotify) {
       if (!pItemchild)
         continue;
 
-      CFX_WideString text = pItemchild->GetContent();
-      CFX_WideString wsChildValue = text;
+      WideString text = pItemchild->GetContent();
+      WideString wsChildValue = text;
       if (wsValue != text) {
         pItemchild = pItemchild->GetNodeItem(XFA_NODEITEM_NextSibling);
         if (pItemchild)
@@ -569,7 +569,7 @@ void CXFA_WidgetData::SetCheckState(XFA_CHECKSTATE eCheckState, bool bNotify) {
 
     int32_t i = -1;
     CXFA_Node* pText = pItems->GetNodeItem(XFA_NODEITEM_FirstChild);
-    CFX_WideString wsContent;
+    WideString wsContent;
     while (pText) {
       i++;
       if (i == eCheckState) {
@@ -591,7 +591,7 @@ CXFA_Node* CXFA_WidgetData::GetExclGroupNode() {
 
 CXFA_Node* CXFA_WidgetData::GetSelectedMember() {
   CXFA_Node* pSelectedMember = nullptr;
-  CFX_WideString wsState = GetRawValue();
+  WideString wsState = GetRawValue();
   if (wsState.IsEmpty())
     return pSelectedMember;
 
@@ -606,7 +606,7 @@ CXFA_Node* CXFA_WidgetData::GetSelectedMember() {
   return pSelectedMember;
 }
 
-CXFA_Node* CXFA_WidgetData::SetSelectedMember(const CFX_WideStringC& wsName,
+CXFA_Node* CXFA_WidgetData::SetSelectedMember(const WideStringView& wsName,
                                               bool bNotify) {
   uint32_t nameHash = FX_HashCode_GetW(wsName, false);
   for (CXFA_Node* pNode = ToNode(m_pNode->GetNodeItem(XFA_NODEITEM_FirstChild));
@@ -620,11 +620,11 @@ CXFA_Node* CXFA_WidgetData::SetSelectedMember(const CFX_WideStringC& wsName,
   return nullptr;
 }
 
-void CXFA_WidgetData::SetSelectedMemberByValue(const CFX_WideStringC& wsValue,
+void CXFA_WidgetData::SetSelectedMemberByValue(const WideStringView& wsValue,
                                                bool bNotify,
                                                bool bScriptModify,
                                                bool bSyncData) {
-  CFX_WideString wsExclGroup;
+  WideString wsExclGroup;
   for (CXFA_Node* pNode = m_pNode->GetNodeItem(XFA_NODEITEM_FirstChild); pNode;
        pNode = pNode->GetNodeItem(XFA_NODEITEM_NextSibling)) {
     if (pNode->GetElementType() != XFA_Element::Field)
@@ -638,7 +638,7 @@ void CXFA_WidgetData::SetSelectedMemberByValue(const CFX_WideStringC& wsValue,
     if (!pItemchild)
       continue;
 
-    CFX_WideString wsChildValue = pItemchild->GetContent();
+    WideString wsChildValue = pItemchild->GetContent();
     if (wsValue != wsChildValue) {
       pItemchild = pItemchild->GetNodeItem(XFA_NODEITEM_NextSibling);
       if (pItemchild)
@@ -740,7 +740,7 @@ int32_t CXFA_WidgetData::CountChoiceListItems(bool bSaveValue) {
   return pItem->CountChildren(XFA_Element::Unknown);
 }
 
-bool CXFA_WidgetData::GetChoiceListItem(CFX_WideString& wsText,
+bool CXFA_WidgetData::GetChoiceListItem(WideString& wsText,
                                         int32_t nIndex,
                                         bool bSaveValue) {
   wsText.clear();
@@ -776,8 +776,7 @@ bool CXFA_WidgetData::GetChoiceListItem(CFX_WideString& wsText,
   return false;
 }
 
-std::vector<CFX_WideString> CXFA_WidgetData::GetChoiceListItems(
-    bool bSaveValue) {
+std::vector<WideString> CXFA_WidgetData::GetChoiceListItems(bool bSaveValue) {
   std::vector<CXFA_Node*> items;
   for (CXFA_Node* pNode = m_pNode->GetNodeItem(XFA_NODEITEM_FirstChild);
        pNode && items.size() < 2;
@@ -786,7 +785,7 @@ std::vector<CFX_WideString> CXFA_WidgetData::GetChoiceListItems(
       items.push_back(pNode);
   }
   if (items.empty())
-    return std::vector<CFX_WideString>();
+    return std::vector<WideString>();
 
   CXFA_Node* pItem = items.front();
   if (items.size() > 1) {
@@ -796,7 +795,7 @@ std::vector<CFX_WideString> CXFA_WidgetData::GetChoiceListItems(
       pItem = items[1];
   }
 
-  std::vector<CFX_WideString> wsTextArray;
+  std::vector<WideString> wsTextArray;
   for (CXFA_Node* pNode = pItem->GetNodeItem(XFA_NODEITEM_FirstChild); pNode;
        pNode = pNode->GetNodeItem(XFA_NODEITEM_NextSibling)) {
     wsTextArray.emplace_back();
@@ -806,12 +805,12 @@ std::vector<CFX_WideString> CXFA_WidgetData::GetChoiceListItems(
 }
 
 int32_t CXFA_WidgetData::CountSelectedItems() {
-  std::vector<CFX_WideString> wsValueArray = GetSelectedItemsValue();
+  std::vector<WideString> wsValueArray = GetSelectedItemsValue();
   if (IsListBox() || !IsChoiceListAllowTextEntry())
     return pdfium::CollectionSize<int32_t>(wsValueArray);
 
   int32_t iSelected = 0;
-  std::vector<CFX_WideString> wsSaveTextArray = GetChoiceListItems(true);
+  std::vector<WideString> wsSaveTextArray = GetChoiceListItems(true);
   for (const auto& value : wsValueArray) {
     if (pdfium::ContainsValue(wsSaveTextArray, value))
       iSelected++;
@@ -820,11 +819,11 @@ int32_t CXFA_WidgetData::CountSelectedItems() {
 }
 
 int32_t CXFA_WidgetData::GetSelectedItem(int32_t nIndex) {
-  std::vector<CFX_WideString> wsValueArray = GetSelectedItemsValue();
+  std::vector<WideString> wsValueArray = GetSelectedItemsValue();
   if (!pdfium::IndexInBounds(wsValueArray, nIndex))
     return -1;
 
-  std::vector<CFX_WideString> wsSaveTextArray = GetChoiceListItems(true);
+  std::vector<WideString> wsSaveTextArray = GetChoiceListItems(true);
   auto it = std::find(wsSaveTextArray.begin(), wsSaveTextArray.end(),
                       wsValueArray[nIndex]);
   return it != wsSaveTextArray.end() ? it - wsSaveTextArray.begin() : -1;
@@ -832,8 +831,8 @@ int32_t CXFA_WidgetData::GetSelectedItem(int32_t nIndex) {
 
 std::vector<int32_t> CXFA_WidgetData::GetSelectedItems() {
   std::vector<int32_t> iSelArray;
-  std::vector<CFX_WideString> wsValueArray = GetSelectedItemsValue();
-  std::vector<CFX_WideString> wsSaveTextArray = GetChoiceListItems(true);
+  std::vector<WideString> wsValueArray = GetSelectedItemsValue();
+  std::vector<WideString> wsSaveTextArray = GetChoiceListItems(true);
   for (const auto& value : wsValueArray) {
     auto it = std::find(wsSaveTextArray.begin(), wsSaveTextArray.end(), value);
     if (it != wsSaveTextArray.end())
@@ -842,9 +841,9 @@ std::vector<int32_t> CXFA_WidgetData::GetSelectedItems() {
   return iSelArray;
 }
 
-std::vector<CFX_WideString> CXFA_WidgetData::GetSelectedItemsValue() {
-  std::vector<CFX_WideString> wsSelTextArray;
-  CFX_WideString wsValue = GetRawValue();
+std::vector<WideString> CXFA_WidgetData::GetSelectedItemsValue() {
+  std::vector<WideString> wsSelTextArray;
+  WideString wsValue = GetRawValue();
   if (GetChoiceListOpen() == XFA_ATTRIBUTEENUM_MultiSelect) {
     if (!wsValue.IsEmpty()) {
       FX_STRSIZE iStart = 0;
@@ -868,7 +867,7 @@ std::vector<CFX_WideString> CXFA_WidgetData::GetSelectedItemsValue() {
 }
 
 bool CXFA_WidgetData::GetItemState(int32_t nIndex) {
-  std::vector<CFX_WideString> wsSaveTextArray = GetChoiceListItems(true);
+  std::vector<WideString> wsSaveTextArray = GetChoiceListItems(true);
   return pdfium::IndexInBounds(wsSaveTextArray, nIndex) &&
          pdfium::ContainsValue(GetSelectedItemsValue(),
                                wsSaveTextArray[nIndex]);
@@ -879,12 +878,12 @@ void CXFA_WidgetData::SetItemState(int32_t nIndex,
                                    bool bNotify,
                                    bool bScriptModify,
                                    bool bSyncData) {
-  std::vector<CFX_WideString> wsSaveTextArray = GetChoiceListItems(true);
+  std::vector<WideString> wsSaveTextArray = GetChoiceListItems(true);
   if (!pdfium::IndexInBounds(wsSaveTextArray, nIndex))
     return;
 
   int32_t iSel = -1;
-  std::vector<CFX_WideString> wsValueArray = GetSelectedItemsValue();
+  std::vector<WideString> wsValueArray = GetSelectedItemsValue();
   auto it = std::find(wsValueArray.begin(), wsValueArray.end(),
                       wsSaveTextArray[nIndex]);
   if (it != wsValueArray.end())
@@ -893,7 +892,7 @@ void CXFA_WidgetData::SetItemState(int32_t nIndex,
   if (GetChoiceListOpen() == XFA_ATTRIBUTEENUM_MultiSelect) {
     if (bSelected) {
       if (iSel < 0) {
-        CFX_WideString wsValue = GetRawValue();
+        WideString wsValue = GetRawValue();
         if (!wsValue.IsEmpty()) {
           wsValue += L"\n";
         }
@@ -911,15 +910,15 @@ void CXFA_WidgetData::SetItemState(int32_t nIndex,
   } else {
     if (bSelected) {
       if (iSel < 0) {
-        CFX_WideString wsSaveText = wsSaveTextArray[nIndex];
-        CFX_WideString wsFormatText(wsSaveText);
+        WideString wsSaveText = wsSaveTextArray[nIndex];
+        WideString wsFormatText(wsSaveText);
         GetFormatDataValue(wsSaveText, wsFormatText);
         m_pNode->SetContent(wsSaveText, wsFormatText, bNotify, bScriptModify,
                             bSyncData);
       }
     } else if (iSel >= 0) {
-      m_pNode->SetContent(CFX_WideString(), CFX_WideString(), bNotify,
-                          bScriptModify, bSyncData);
+      m_pNode->SetContent(WideString(), WideString(), bNotify, bScriptModify,
+                          bSyncData);
     }
   }
 }
@@ -928,18 +927,18 @@ void CXFA_WidgetData::SetSelectedItems(const std::vector<int32_t>& iSelArray,
                                        bool bNotify,
                                        bool bScriptModify,
                                        bool bSyncData) {
-  CFX_WideString wsValue;
+  WideString wsValue;
   int32_t iSize = pdfium::CollectionSize<int32_t>(iSelArray);
   if (iSize >= 1) {
-    std::vector<CFX_WideString> wsSaveTextArray = GetChoiceListItems(true);
-    CFX_WideString wsItemValue;
+    std::vector<WideString> wsSaveTextArray = GetChoiceListItems(true);
+    WideString wsItemValue;
     for (int32_t i = 0; i < iSize; i++) {
       wsItemValue = (iSize == 1) ? wsSaveTextArray[iSelArray[i]]
                                  : wsSaveTextArray[iSelArray[i]] + L"\n";
       wsValue += wsItemValue;
     }
   }
-  CFX_WideString wsFormat(wsValue);
+  WideString wsFormat(wsValue);
   if (GetChoiceListOpen() != XFA_ATTRIBUTEENUM_MultiSelect)
     GetFormatDataValue(wsValue, wsFormat);
 
@@ -949,7 +948,7 @@ void CXFA_WidgetData::SetSelectedItems(const std::vector<int32_t>& iSelArray,
 void CXFA_WidgetData::ClearAllSelections() {
   CXFA_Node* pBind = m_pNode->GetBindData();
   if (!pBind || GetChoiceListOpen() != XFA_ATTRIBUTEENUM_MultiSelect) {
-    SyncValue(CFX_WideString(), false);
+    SyncValue(WideString(), false);
     return;
   }
 
@@ -957,11 +956,11 @@ void CXFA_WidgetData::ClearAllSelections() {
     pBind->RemoveChild(pChildNode);
 }
 
-void CXFA_WidgetData::InsertItem(const CFX_WideString& wsLabel,
-                                 const CFX_WideString& wsValue,
+void CXFA_WidgetData::InsertItem(const WideString& wsLabel,
+                                 const WideString& wsValue,
                                  bool bNotify) {
   int32_t nIndex = -1;
-  CFX_WideString wsNewValue(wsValue);
+  WideString wsNewValue(wsValue);
   if (wsNewValue.IsEmpty())
     wsNewValue = wsLabel;
 
@@ -999,7 +998,7 @@ void CXFA_WidgetData::InsertItem(const CFX_WideString& wsLabel,
     CXFA_Node* pListNode = pNode->GetNodeItem(XFA_NODEITEM_FirstChild);
     int32_t i = 0;
     while (pListNode) {
-      CFX_WideString wsOldValue;
+      WideString wsOldValue;
       pListNode->TryContent(wsOldValue);
       InsertListTextItem(pSaveItems, wsOldValue, i);
       i++;
@@ -1015,8 +1014,8 @@ void CXFA_WidgetData::InsertItem(const CFX_WideString& wsLabel,
       this, wsLabel.c_str(), wsValue.c_str(), nIndex);
 }
 
-void CXFA_WidgetData::GetItemLabel(const CFX_WideStringC& wsValue,
-                                   CFX_WideString& wsLabel) {
+void CXFA_WidgetData::GetItemLabel(const WideStringView& wsValue,
+                                   WideString& wsLabel) {
   int32_t iCount = 0;
   std::vector<CXFA_Node*> listitems;
   CXFA_Node* pItems = m_pNode->GetNodeItem(XFA_NODEITEM_FirstChild);
@@ -1040,7 +1039,7 @@ void CXFA_WidgetData::GetItemLabel(const CFX_WideStringC& wsValue,
     }
     iCount = 0;
     int32_t iSearch = -1;
-    CFX_WideString wsContent;
+    WideString wsContent;
     CXFA_Node* pChildItem = pSaveItems->GetNodeItem(XFA_NODEITEM_FirstChild);
     for (; pChildItem;
          pChildItem = pChildItem->GetNodeItem(XFA_NODEITEM_NextSibling)) {
@@ -1060,8 +1059,8 @@ void CXFA_WidgetData::GetItemLabel(const CFX_WideStringC& wsValue,
   }
 }
 
-void CXFA_WidgetData::GetItemValue(const CFX_WideStringC& wsLabel,
-                                   CFX_WideString& wsValue) {
+void CXFA_WidgetData::GetItemValue(const WideStringView& wsLabel,
+                                   WideString& wsValue) {
   int32_t iCount = 0;
   std::vector<CXFA_Node*> listitems;
   for (CXFA_Node* pItems = m_pNode->GetNodeItem(XFA_NODEITEM_FirstChild);
@@ -1085,7 +1084,7 @@ void CXFA_WidgetData::GetItemValue(const CFX_WideStringC& wsLabel,
     }
     iCount = 0;
     int32_t iSearch = -1;
-    CFX_WideString wsContent;
+    WideString wsContent;
     CXFA_Node* pChildItem = pLabelItems->GetNodeItem(XFA_NODEITEM_FirstChild);
     for (; pChildItem;
          pChildItem = pChildItem->GetNodeItem(XFA_NODEITEM_NextSibling)) {
@@ -1154,15 +1153,15 @@ int32_t CXFA_WidgetData::GetNumberOfCells() {
   return -1;
 }
 
-CFX_WideString CXFA_WidgetData::GetBarcodeType() {
+WideString CXFA_WidgetData::GetBarcodeType() {
   CXFA_Node* pUIChild = GetUIChild();
-  return pUIChild ? CFX_WideString(pUIChild->GetCData(XFA_ATTRIBUTE_Type))
-                  : CFX_WideString();
+  return pUIChild ? WideString(pUIChild->GetCData(XFA_ATTRIBUTE_Type))
+                  : WideString();
 }
 
 bool CXFA_WidgetData::GetBarcodeAttribute_CharEncoding(int32_t* val) {
   CXFA_Node* pUIChild = GetUIChild();
-  CFX_WideString wsCharEncoding;
+  WideString wsCharEncoding;
   if (pUIChild->TryCData(XFA_ATTRIBUTE_CharEncoding, wsCharEncoding)) {
     if (wsCharEncoding.CompareNoCase(L"UTF-16")) {
       *val = CHAR_ENCODING_UNICODE;
@@ -1202,7 +1201,7 @@ bool CXFA_WidgetData::GetBarcodeAttribute_Checksum(bool* val) {
 
 bool CXFA_WidgetData::GetBarcodeAttribute_DataLength(int32_t* val) {
   CXFA_Node* pUIChild = GetUIChild();
-  CFX_WideString wsDataLength;
+  WideString wsDataLength;
   if (pUIChild->TryCData(XFA_ATTRIBUTE_DataLength, wsDataLength)) {
     *val = FXSYS_wtoi(wsDataLength.c_str());
     return true;
@@ -1212,7 +1211,7 @@ bool CXFA_WidgetData::GetBarcodeAttribute_DataLength(int32_t* val) {
 
 bool CXFA_WidgetData::GetBarcodeAttribute_StartChar(char* val) {
   CXFA_Node* pUIChild = GetUIChild();
-  CFX_WideStringC wsStartEndChar;
+  WideStringView wsStartEndChar;
   if (pUIChild->TryCData(XFA_ATTRIBUTE_StartChar, wsStartEndChar)) {
     if (wsStartEndChar.GetLength()) {
       *val = static_cast<char>(wsStartEndChar[0]);
@@ -1224,7 +1223,7 @@ bool CXFA_WidgetData::GetBarcodeAttribute_StartChar(char* val) {
 
 bool CXFA_WidgetData::GetBarcodeAttribute_EndChar(char* val) {
   CXFA_Node* pUIChild = GetUIChild();
-  CFX_WideStringC wsStartEndChar;
+  WideStringView wsStartEndChar;
   if (pUIChild->TryCData(XFA_ATTRIBUTE_EndChar, wsStartEndChar)) {
     if (wsStartEndChar.GetLength()) {
       *val = static_cast<char>(wsStartEndChar[0]);
@@ -1236,7 +1235,7 @@ bool CXFA_WidgetData::GetBarcodeAttribute_EndChar(char* val) {
 
 bool CXFA_WidgetData::GetBarcodeAttribute_ECLevel(int32_t* val) {
   CXFA_Node* pUIChild = GetUIChild();
-  CFX_WideString wsECLevel;
+  WideString wsECLevel;
   if (pUIChild->TryCData(XFA_ATTRIBUTE_ErrorCorrectionLevel, wsECLevel)) {
     *val = FXSYS_wtoi(wsECLevel.c_str());
     return true;
@@ -1313,7 +1312,7 @@ bool CXFA_WidgetData::GetBarcodeAttribute_Truncate(bool* val) {
 
 bool CXFA_WidgetData::GetBarcodeAttribute_WideNarrowRatio(float* val) {
   CXFA_Node* pUIChild = GetUIChild();
-  CFX_WideString wsWideNarrowRatio;
+  WideString wsWideNarrowRatio;
   if (pUIChild->TryCData(XFA_ATTRIBUTE_WideNarrowRatio, wsWideNarrowRatio)) {
     auto ptPos = wsWideNarrowRatio.Find(':');
     float fRatio = 0;
@@ -1335,7 +1334,7 @@ bool CXFA_WidgetData::GetBarcodeAttribute_WideNarrowRatio(float* val) {
   return false;
 }
 
-void CXFA_WidgetData::GetPasswordChar(CFX_WideString& wsPassWord) {
+void CXFA_WidgetData::GetPasswordChar(WideString& wsPassWord) {
   CXFA_Node* pUIChild = GetUIChild();
   if (pUIChild) {
     pUIChild->TryCData(XFA_ATTRIBUTE_PasswordChar, wsPassWord);
@@ -1400,7 +1399,7 @@ bool CXFA_WidgetData::GetLeadDigits(int32_t& iLeadDigits) {
   return false;
 }
 
-bool CXFA_WidgetData::SetValue(const CFX_WideString& wsValue,
+bool CXFA_WidgetData::SetValue(const WideString& wsValue,
                                XFA_VALUEPICTURE eValueType) {
   if (wsValue.IsEmpty()) {
     SyncValue(wsValue, true);
@@ -1408,8 +1407,8 @@ bool CXFA_WidgetData::SetValue(const CFX_WideString& wsValue,
   }
   m_bPreNull = m_bIsNull;
   m_bIsNull = false;
-  CFX_WideString wsNewText(wsValue);
-  CFX_WideString wsPicture;
+  WideString wsNewText(wsValue);
+  WideString wsPicture;
   GetPictureContent(wsPicture, eValueType);
   bool bValidate = true;
   bool bSyncData = false;
@@ -1455,7 +1454,7 @@ bool CXFA_WidgetData::SetValue(const CFX_WideString& wsValue,
   return bValidate;
 }
 
-bool CXFA_WidgetData::GetPictureContent(CFX_WideString& wsPicture,
+bool CXFA_WidgetData::GetPictureContent(WideString& wsPicture,
                                         XFA_VALUEPICTURE ePicture) {
   if (ePicture == XFA_VALUEPICTURE_Raw)
     return false;
@@ -1549,7 +1548,7 @@ IFX_Locale* CXFA_WidgetData::GetLocal() {
   if (!m_pNode)
     return nullptr;
 
-  CFX_WideString wsLocaleName;
+  WideString wsLocaleName;
   if (!m_pNode->GetLocaleName(wsLocaleName))
     return nullptr;
   if (wsLocaleName == L"ambient")
@@ -1557,14 +1556,14 @@ IFX_Locale* CXFA_WidgetData::GetLocal() {
   return m_pNode->GetDocument()->GetLocalMgr()->GetLocaleByName(wsLocaleName);
 }
 
-bool CXFA_WidgetData::GetValue(CFX_WideString& wsValue,
+bool CXFA_WidgetData::GetValue(WideString& wsValue,
                                XFA_VALUEPICTURE eValueType) {
   wsValue = m_pNode->GetContent();
 
   if (eValueType == XFA_VALUEPICTURE_Display)
-    GetItemLabel(wsValue.AsStringC(), wsValue);
+    GetItemLabel(wsValue.AsStringView(), wsValue);
 
-  CFX_WideString wsPicture;
+  WideString wsPicture;
   GetPictureContent(wsPicture, eValueType);
   CXFA_Node* pNode = GetUIChild();
   if (!pNode)
@@ -1584,7 +1583,7 @@ bool CXFA_WidgetData::GetValue(CFX_WideString& wsValue,
       if (eValueType != XFA_VALUEPICTURE_Raw && wsPicture.IsEmpty()) {
         IFX_Locale* pLocale = GetLocal();
         if (eValueType == XFA_VALUEPICTURE_Display && pLocale) {
-          CFX_WideString wsOutput;
+          WideString wsOutput;
           NormalizeNumStr(wsValue, wsOutput);
           FormatNumStr(wsOutput, pLocale, wsOutput);
           wsValue = wsOutput;
@@ -1602,7 +1601,7 @@ bool CXFA_WidgetData::GetValue(CFX_WideString& wsValue,
     CXFA_LocaleMgr* pLocalMgr = m_pNode->GetDocument()->GetLocalMgr();
     switch (widgetValue.GetType()) {
       case XFA_VT_DATE: {
-        CFX_WideString wsDate, wsTime;
+        WideString wsDate, wsTime;
         if (SplitDateTime(wsValue, wsDate, wsTime)) {
           CXFA_LocaleValue date(XFA_VT_DATE, wsDate, pLocalMgr);
           if (date.FormatPatterns(wsValue, wsPicture, pLocale, eValueType))
@@ -1611,7 +1610,7 @@ bool CXFA_WidgetData::GetValue(CFX_WideString& wsValue,
         break;
       }
       case XFA_VT_TIME: {
-        CFX_WideString wsDate, wsTime;
+        WideString wsDate, wsTime;
         if (SplitDateTime(wsValue, wsDate, wsTime)) {
           CXFA_LocaleValue time(XFA_VT_TIME, wsTime, pLocalMgr);
           if (time.FormatPatterns(wsValue, wsPicture, pLocale, eValueType))
@@ -1627,13 +1626,13 @@ bool CXFA_WidgetData::GetValue(CFX_WideString& wsValue,
   return true;
 }
 
-bool CXFA_WidgetData::GetNormalizeDataValue(const CFX_WideString& wsValue,
-                                            CFX_WideString& wsNormalizeValue) {
+bool CXFA_WidgetData::GetNormalizeDataValue(const WideString& wsValue,
+                                            WideString& wsNormalizeValue) {
   wsNormalizeValue = wsValue;
   if (wsValue.IsEmpty())
     return true;
 
-  CFX_WideString wsPicture;
+  WideString wsPicture;
   GetPictureContent(wsPicture, XFA_VALUEPICTURE_DataBind);
   if (wsPicture.IsEmpty())
     return true;
@@ -1651,13 +1650,13 @@ bool CXFA_WidgetData::GetNormalizeDataValue(const CFX_WideString& wsValue,
   return false;
 }
 
-bool CXFA_WidgetData::GetFormatDataValue(const CFX_WideString& wsValue,
-                                         CFX_WideString& wsFormattedValue) {
+bool CXFA_WidgetData::GetFormatDataValue(const WideString& wsValue,
+                                         WideString& wsFormattedValue) {
   wsFormattedValue = wsValue;
   if (wsValue.IsEmpty())
     return true;
 
-  CFX_WideString wsPicture;
+  WideString wsPicture;
   GetPictureContent(wsPicture, XFA_VALUEPICTURE_DataBind);
   if (wsPicture.IsEmpty())
     return true;
@@ -1706,7 +1705,7 @@ bool CXFA_WidgetData::GetFormatDataValue(const CFX_WideString& wsValue,
     CXFA_LocaleValue widgetValue(iVTType, wsValue, pLocalMgr);
     switch (widgetValue.GetType()) {
       case XFA_VT_DATE: {
-        CFX_WideString wsDate, wsTime;
+        WideString wsDate, wsTime;
         if (SplitDateTime(wsValue, wsDate, wsTime)) {
           CXFA_LocaleValue date(XFA_VT_DATE, wsDate, pLocalMgr);
           if (date.FormatPatterns(wsFormattedValue, wsPicture, pLocale,
@@ -1717,7 +1716,7 @@ bool CXFA_WidgetData::GetFormatDataValue(const CFX_WideString& wsValue,
         break;
       }
       case XFA_VT_TIME: {
-        CFX_WideString wsDate, wsTime;
+        WideString wsDate, wsTime;
         if (SplitDateTime(wsValue, wsDate, wsTime)) {
           CXFA_LocaleValue time(XFA_VT_TIME, wsTime, pLocalMgr);
           if (time.FormatPatterns(wsFormattedValue, wsPicture, pLocale,
@@ -1736,8 +1735,8 @@ bool CXFA_WidgetData::GetFormatDataValue(const CFX_WideString& wsValue,
   return false;
 }
 
-void CXFA_WidgetData::NormalizeNumStr(const CFX_WideString& wsValue,
-                                      CFX_WideString& wsOutput) {
+void CXFA_WidgetData::NormalizeNumStr(const WideString& wsValue,
+                                      WideString& wsOutput) {
   if (wsValue.IsEmpty())
     return;
 
@@ -1753,14 +1752,14 @@ void CXFA_WidgetData::NormalizeNumStr(const CFX_WideString& wsValue,
     wsOutput.InsertAtFront('0');
 }
 
-void CXFA_WidgetData::FormatNumStr(const CFX_WideString& wsValue,
+void CXFA_WidgetData::FormatNumStr(const WideString& wsValue,
                                    IFX_Locale* pLocale,
-                                   CFX_WideString& wsOutput) {
+                                   WideString& wsOutput) {
   if (wsValue.IsEmpty())
     return;
 
-  CFX_WideString wsSrcNum = wsValue;
-  CFX_WideString wsGroupSymbol =
+  WideString wsSrcNum = wsValue;
+  WideString wsGroupSymbol =
       pLocale->GetNumbericSymbol(FX_LOCALENUMSYMBOL_Grouping);
   bool bNeg = false;
   if (wsSrcNum[0] == '-') {
@@ -1791,11 +1790,11 @@ void CXFA_WidgetData::FormatNumStr(const CFX_WideString& wsValue,
   }
 }
 
-void CXFA_WidgetData::SyncValue(const CFX_WideString& wsValue, bool bNotify) {
+void CXFA_WidgetData::SyncValue(const WideString& wsValue, bool bNotify) {
   if (!m_pNode)
     return;
 
-  CFX_WideString wsFormatValue(wsValue);
+  WideString wsFormatValue(wsValue);
   CXFA_WidgetData* pContainerWidgetData = m_pNode->GetContainerWidgetData();
   if (pContainerWidgetData)
     pContainerWidgetData->GetFormatDataValue(wsValue, wsFormatValue);
@@ -1804,20 +1803,20 @@ void CXFA_WidgetData::SyncValue(const CFX_WideString& wsValue, bool bNotify) {
 }
 
 void CXFA_WidgetData::InsertListTextItem(CXFA_Node* pItems,
-                                         const CFX_WideString& wsText,
+                                         const WideString& wsText,
                                          int32_t nIndex) {
   CXFA_Node* pText = pItems->CreateSamePacketNode(XFA_Element::Text);
   pItems->InsertChild(nIndex, pText);
   pText->SetContent(wsText, wsText, false, false, false);
 }
 
-CFX_WideString CXFA_WidgetData::NumericLimit(const CFX_WideString& wsValue,
-                                             int32_t iLead,
-                                             int32_t iTread) const {
+WideString CXFA_WidgetData::NumericLimit(const WideString& wsValue,
+                                         int32_t iLead,
+                                         int32_t iTread) const {
   if ((iLead == -1) && (iTread == -1))
     return wsValue;
 
-  CFX_WideString wsRet;
+  WideString wsRet;
   int32_t iLead_ = 0, iTread_ = -1;
   int32_t iCount = wsValue.GetLength();
   if (iCount == 0)
@@ -1839,7 +1838,7 @@ CFX_WideString CXFA_WidgetData::NumericLimit(const CFX_WideString& wsValue,
         iTread_++;
         if (iTread_ > iTread) {
           if (iTread != -1) {
-            CFX_Decimal wsDeci = CFX_Decimal(wsValue.AsStringC());
+            CFX_Decimal wsDeci = CFX_Decimal(wsValue.AsStringView());
             wsDeci.SetScale(iTread);
             wsRet = wsDeci;
           }
diff --git a/xfa/fxfa/parser/cxfa_widgetdata.h b/xfa/fxfa/parser/cxfa_widgetdata.h
index f53d926655..69f8d0d5a2 100644
--- a/xfa/fxfa/parser/cxfa_widgetdata.h
+++ b/xfa/fxfa/parser/cxfa_widgetdata.h
@@ -45,7 +45,7 @@ class CXFA_WidgetData : public CXFA_Data {
 
   CXFA_Node* GetUIChild();
   XFA_Element GetUIType();
-  CFX_WideString GetRawValue();
+  WideString GetRawValue();
   int32_t GetAccess();
   int32_t GetRotate();
 
@@ -73,8 +73,8 @@ class CXFA_WidgetData : public CXFA_Data {
   CXFA_Border GetUIBorder();
   CFX_RectF GetUIMargin();
   int32_t GetButtonHighlight();
-  bool GetButtonRollover(CFX_WideString& wsRollover, bool& bRichText);
-  bool GetButtonDown(CFX_WideString& wsDown, bool& bRichText);
+  bool GetButtonRollover(WideString& wsRollover, bool& bRichText);
+  bool GetButtonDown(WideString& wsDown, bool& bRichText);
   int32_t GetCheckButtonShape();
   int32_t GetCheckButtonMark();
   float GetCheckButtonSize();
@@ -84,8 +84,8 @@ class CXFA_WidgetData : public CXFA_Data {
   void SetCheckState(XFA_CHECKSTATE eCheckState, bool bNotify);
   CXFA_Node* GetExclGroupNode();
   CXFA_Node* GetSelectedMember();
-  CXFA_Node* SetSelectedMember(const CFX_WideStringC& wsName, bool bNotify);
-  void SetSelectedMemberByValue(const CFX_WideStringC& wsValue,
+  CXFA_Node* SetSelectedMember(const WideStringView& wsName, bool bNotify);
+  void SetSelectedMemberByValue(const WideStringView& wsValue,
                                 bool bNotify,
                                 bool bScriptModify,
                                 bool bSyncData);
@@ -96,14 +96,12 @@ class CXFA_WidgetData : public CXFA_Data {
   int32_t GetChoiceListOpen();
   bool IsListBox();
   int32_t CountChoiceListItems(bool bSaveValue);
-  bool GetChoiceListItem(CFX_WideString& wsText,
-                         int32_t nIndex,
-                         bool bSaveValue);
-  std::vector<CFX_WideString> GetChoiceListItems(bool bSaveValue);
+  bool GetChoiceListItem(WideString& wsText, int32_t nIndex, bool bSaveValue);
+  std::vector<WideString> GetChoiceListItems(bool bSaveValue);
   int32_t CountSelectedItems();
   int32_t GetSelectedItem(int32_t nIndex);
   std::vector<int32_t> GetSelectedItems();
-  std::vector<CFX_WideString> GetSelectedItemsValue();
+  std::vector<WideString> GetSelectedItemsValue();
   bool GetItemState(int32_t nIndex);
   void SetItemState(int32_t nIndex,
                     bool bSelected,
@@ -115,25 +113,25 @@ class CXFA_WidgetData : public CXFA_Data {
                         bool bScriptModify,
                         bool bSyncData);
   void ClearAllSelections();
-  void InsertItem(const CFX_WideString& wsLabel,
-                  const CFX_WideString& wsValue,
+  void InsertItem(const WideString& wsLabel,
+                  const WideString& wsValue,
                   bool bNotify);
-  void GetItemLabel(const CFX_WideStringC& wsValue, CFX_WideString& wsLabel);
-  void GetItemValue(const CFX_WideStringC& wsLabel, CFX_WideString& wsValue);
+  void GetItemLabel(const WideStringView& wsValue, WideString& wsLabel);
+  void GetItemValue(const WideStringView& wsLabel, WideString& wsValue);
   bool DeleteItem(int32_t nIndex, bool bNotify, bool bScriptModify);
   int32_t GetHorizontalScrollPolicy();
   int32_t GetNumberOfCells();
-  bool SetValue(const CFX_WideString& wsValue, XFA_VALUEPICTURE eValueType);
-  bool GetPictureContent(CFX_WideString& wsPicture, XFA_VALUEPICTURE ePicture);
+  bool SetValue(const WideString& wsValue, XFA_VALUEPICTURE eValueType);
+  bool GetPictureContent(WideString& wsPicture, XFA_VALUEPICTURE ePicture);
   IFX_Locale* GetLocal();
-  bool GetValue(CFX_WideString& wsValue, XFA_VALUEPICTURE eValueType);
-  bool GetNormalizeDataValue(const CFX_WideString& wsValue,
-                             CFX_WideString& wsNormalizeValue);
-  bool GetFormatDataValue(const CFX_WideString& wsValue,
-                          CFX_WideString& wsFormattedValue);
-  void NormalizeNumStr(const CFX_WideString& wsValue, CFX_WideString& wsOutput);
-
-  CFX_WideString GetBarcodeType();
+  bool GetValue(WideString& wsValue, XFA_VALUEPICTURE eValueType);
+  bool GetNormalizeDataValue(const WideString& wsValue,
+                             WideString& wsNormalizeValue);
+  bool GetFormatDataValue(const WideString& wsValue,
+                          WideString& wsFormattedValue);
+  void NormalizeNumStr(const WideString& wsValue, WideString& wsOutput);
+
+  WideString GetBarcodeType();
   bool GetBarcodeAttribute_CharEncoding(int32_t* val);
   bool GetBarcodeAttribute_Checksum(bool* val);
   bool GetBarcodeAttribute_DataLength(int32_t* val);
@@ -146,7 +144,7 @@ class CXFA_WidgetData : public CXFA_Data {
   bool GetBarcodeAttribute_TextLocation(int32_t* val);
   bool GetBarcodeAttribute_Truncate(bool* val);
   bool GetBarcodeAttribute_WideNarrowRatio(float* val);
-  void GetPasswordChar(CFX_WideString& wsPassWord);
+  void GetPasswordChar(WideString& wsPassWord);
 
   bool IsMultiLine();
   int32_t GetVerticalScrollPolicy();
@@ -154,22 +152,22 @@ class CXFA_WidgetData : public CXFA_Data {
   bool GetFracDigits(int32_t& iFracDigits);
   bool GetLeadDigits(int32_t& iLeadDigits);
 
-  CFX_WideString NumericLimit(const CFX_WideString& wsValue,
-                              int32_t iLead,
-                              int32_t iTread) const;
+  WideString NumericLimit(const WideString& wsValue,
+                          int32_t iLead,
+                          int32_t iTread) const;
 
   bool m_bIsNull;
   bool m_bPreNull;
 
  private:
   CXFA_Bind GetBind();
-  void SyncValue(const CFX_WideString& wsValue, bool bNotify);
+  void SyncValue(const WideString& wsValue, bool bNotify);
   void InsertListTextItem(CXFA_Node* pItems,
-                          const CFX_WideString& wsText,
+                          const WideString& wsText,
                           int32_t nIndex);
-  void FormatNumStr(const CFX_WideString& wsValue,
+  void FormatNumStr(const WideString& wsValue,
                     IFX_Locale* pLocale,
-                    CFX_WideString& wsOutput);
+                    WideString& wsOutput);
 
   CXFA_Node* m_pUiChildNode;
   XFA_Element m_eUIType;
diff --git a/xfa/fxfa/parser/cxfa_xmllocale.cpp b/xfa/fxfa/parser/cxfa_xmllocale.cpp
index 4055c155dd..f9e4353dca 100644
--- a/xfa/fxfa/parser/cxfa_xmllocale.cpp
+++ b/xfa/fxfa/parser/cxfa_xmllocale.cpp
@@ -21,14 +21,13 @@ CXFA_XMLLocale::CXFA_XMLLocale(std::unique_ptr<CXML_Element> pLocaleData)
 
 CXFA_XMLLocale::~CXFA_XMLLocale() {}
 
-CFX_WideString CXFA_XMLLocale::GetName() const {
-  return m_pLocaleData ? m_pLocaleData->GetAttrValue("name") : CFX_WideString();
+WideString CXFA_XMLLocale::GetName() const {
+  return m_pLocaleData ? m_pLocaleData->GetAttrValue("name") : WideString();
 }
 
-CFX_WideString CXFA_XMLLocale::GetNumbericSymbol(
-    FX_LOCALENUMSYMBOL eType) const {
-  CFX_ByteString bsSymbols;
-  CFX_WideString wsName;
+WideString CXFA_XMLLocale::GetNumbericSymbol(FX_LOCALENUMSYMBOL eType) const {
+  ByteString bsSymbols;
+  WideString wsName;
   switch (eType) {
     case FX_LOCALENUMSYMBOL_Decimal:
       bsSymbols = "numberSymbols";
@@ -59,43 +58,43 @@ CFX_WideString CXFA_XMLLocale::GetNumbericSymbol(
       wsName = L"isoname";
       break;
     default:
-      return CFX_WideString();
+      return WideString();
   }
   CXML_Element* pElement =
-      m_pLocaleData->GetElement("", bsSymbols.AsStringC(), 0);
+      m_pLocaleData->GetElement("", bsSymbols.AsStringView(), 0);
   if (!pElement)
-    return CFX_WideString();
+    return WideString();
 
   return GetPattern(
-      pElement, CFX_ByteStringC(bsSymbols.c_str(), bsSymbols.GetLength() - 1),
-      wsName.AsStringC());
+      pElement, ByteStringView(bsSymbols.c_str(), bsSymbols.GetLength() - 1),
+      wsName.AsStringView());
 }
 
-CFX_WideString CXFA_XMLLocale::GetDateTimeSymbols() const {
+WideString CXFA_XMLLocale::GetDateTimeSymbols() const {
   if (!m_pLocaleData)
-    return CFX_WideString();
+    return WideString();
 
   CXML_Element* pNumberSymbols =
       m_pLocaleData->GetElement("", "dateTimeSymbols", 0);
   if (!pNumberSymbols)
-    return CFX_WideString();
+    return WideString();
 
   CXML_Content* pContent = ToContent(pNumberSymbols->GetChild(0));
   if (!pContent)
-    return CFX_WideString();
+    return WideString();
 
   return pContent->m_Content;
 }
 
-CFX_WideString CXFA_XMLLocale::GetMonthName(int32_t nMonth, bool bAbbr) const {
+WideString CXFA_XMLLocale::GetMonthName(int32_t nMonth, bool bAbbr) const {
   return GetCalendarSymbol("month", nMonth, bAbbr);
 }
 
-CFX_WideString CXFA_XMLLocale::GetDayName(int32_t nWeek, bool bAbbr) const {
+WideString CXFA_XMLLocale::GetDayName(int32_t nWeek, bool bAbbr) const {
   return GetCalendarSymbol("day", nWeek, bAbbr);
 }
 
-CFX_WideString CXFA_XMLLocale::GetMeridiemName(bool bAM) const {
+WideString CXFA_XMLLocale::GetMeridiemName(bool bAM) const {
   return GetCalendarSymbol("meridiem", bAM ? 0 : 1, false);
 }
 
@@ -103,47 +102,47 @@ FX_TIMEZONE CXFA_XMLLocale::GetTimeZone() const {
   return CXFA_TimeZoneProvider().GetTimeZone();
 }
 
-CFX_WideString CXFA_XMLLocale::GetEraName(bool bAD) const {
+WideString CXFA_XMLLocale::GetEraName(bool bAD) const {
   return GetCalendarSymbol("era", bAD ? 1 : 0, false);
 }
 
-CFX_WideString CXFA_XMLLocale::GetCalendarSymbol(const CFX_ByteStringC& symbol,
-                                                 int index,
-                                                 bool bAbbr) const {
+WideString CXFA_XMLLocale::GetCalendarSymbol(const ByteStringView& symbol,
+                                             int index,
+                                             bool bAbbr) const {
   if (!m_pLocaleData)
-    return CFX_WideString();
+    return WideString();
 
   CXML_Element* pChild = m_pLocaleData->GetElement("", "calendarSymbols", 0);
   if (!pChild)
-    return CFX_WideString();
+    return WideString();
 
-  CFX_ByteString pstrSymbolNames = symbol + "Names";
+  ByteString pstrSymbolNames = symbol + "Names";
   CXML_Element* pSymbolNames =
-      pChild->GetElement("", pstrSymbolNames.AsStringC(), 0);
+      pChild->GetElement("", pstrSymbolNames.AsStringView(), 0);
   if (!pSymbolNames)
-    return CFX_WideString();
+    return WideString();
 
   if ((!!pSymbolNames->GetAttrInteger("abbr")) != bAbbr)
-    pSymbolNames = pChild->GetElement("", pstrSymbolNames.AsStringC(), 1);
+    pSymbolNames = pChild->GetElement("", pstrSymbolNames.AsStringView(), 1);
 
   if (!pSymbolNames || (!!pSymbolNames->GetAttrInteger("abbr")) != bAbbr)
-    return CFX_WideString();
+    return WideString();
 
   CXML_Element* pSymbolName = pSymbolNames->GetElement("", symbol, index);
   if (!pSymbolName)
-    return CFX_WideString();
+    return WideString();
 
   CXML_Content* pContent = ToContent(pSymbolName->GetChild(0));
-  return pContent ? pContent->m_Content : CFX_WideString();
+  return pContent ? pContent->m_Content : WideString();
 }
 
-CFX_WideString CXFA_XMLLocale::GetDatePattern(
+WideString CXFA_XMLLocale::GetDatePattern(
     FX_LOCALEDATETIMESUBCATEGORY eType) const {
   CXML_Element* pElement = m_pLocaleData->GetElement("", "datePatterns", 0);
   if (!pElement)
-    return CFX_WideString();
+    return WideString();
 
-  CFX_WideString wsName;
+  WideString wsName;
   switch (eType) {
     case FX_LOCALEDATETIMESUBCATEGORY_Short:
       wsName = L"short";
@@ -159,16 +158,16 @@ CFX_WideString CXFA_XMLLocale::GetDatePattern(
       wsName = L"long";
       break;
   }
-  return GetPattern(pElement, "datePattern", wsName.AsStringC());
+  return GetPattern(pElement, "datePattern", wsName.AsStringView());
 }
 
-CFX_WideString CXFA_XMLLocale::GetTimePattern(
+WideString CXFA_XMLLocale::GetTimePattern(
     FX_LOCALEDATETIMESUBCATEGORY eType) const {
   CXML_Element* pElement = m_pLocaleData->GetElement("", "timePatterns", 0);
   if (!pElement)
-    return CFX_WideString();
+    return WideString();
 
-  CFX_WideString wsName;
+  WideString wsName;
   switch (eType) {
     case FX_LOCALEDATETIMESUBCATEGORY_Short:
       wsName = L"short";
@@ -184,26 +183,25 @@ CFX_WideString CXFA_XMLLocale::GetTimePattern(
       wsName = L"long";
       break;
   }
-  return GetPattern(pElement, "timePattern", wsName.AsStringC());
+  return GetPattern(pElement, "timePattern", wsName.AsStringView());
 }
 
-CFX_WideString CXFA_XMLLocale::GetNumPattern(
-    FX_LOCALENUMSUBCATEGORY eType) const {
+WideString CXFA_XMLLocale::GetNumPattern(FX_LOCALENUMSUBCATEGORY eType) const {
   return m_pLocaleData->GetElement("", "numberPatterns", 0)
              ? XFA_PatternToString(eType)
-             : CFX_WideString();
+             : WideString();
 }
 
-CFX_WideString CXFA_XMLLocale::GetPattern(CXML_Element* pElement,
-                                          const CFX_ByteStringC& bsTag,
-                                          const CFX_WideStringC& wsName) const {
+WideString CXFA_XMLLocale::GetPattern(CXML_Element* pElement,
+                                      const ByteStringView& bsTag,
+                                      const WideStringView& wsName) const {
   int32_t iCount = pElement->CountElements("", bsTag);
   for (int32_t i = 0; i < iCount; i++) {
     CXML_Element* pChild = pElement->GetElement("", bsTag, i);
     if (pChild->GetAttrValue("name") == wsName) {
       CXML_Content* pContent = ToContent(pChild->GetChild(0));
-      return pContent ? pContent->m_Content : CFX_WideString();
+      return pContent ? pContent->m_Content : WideString();
     }
   }
-  return CFX_WideString();
+  return WideString();
 }
diff --git a/xfa/fxfa/parser/cxfa_xmllocale.h b/xfa/fxfa/parser/cxfa_xmllocale.h
index a58385601c..5050855ca6 100644
--- a/xfa/fxfa/parser/cxfa_xmllocale.h
+++ b/xfa/fxfa/parser/cxfa_xmllocale.h
@@ -19,29 +19,27 @@ class CXFA_XMLLocale : public IFX_Locale {
   ~CXFA_XMLLocale() override;
 
   // IFX_Locale
-  CFX_WideString GetName() const override;
-  CFX_WideString GetNumbericSymbol(FX_LOCALENUMSYMBOL eType) const override;
+  WideString GetName() const override;
+  WideString GetNumbericSymbol(FX_LOCALENUMSYMBOL eType) const override;
 
-  CFX_WideString GetDateTimeSymbols() const override;
-  CFX_WideString GetMonthName(int32_t nMonth, bool bAbbr) const override;
-  CFX_WideString GetDayName(int32_t nWeek, bool bAbbr) const override;
-  CFX_WideString GetMeridiemName(bool bAM) const override;
+  WideString GetDateTimeSymbols() const override;
+  WideString GetMonthName(int32_t nMonth, bool bAbbr) const override;
+  WideString GetDayName(int32_t nWeek, bool bAbbr) const override;
+  WideString GetMeridiemName(bool bAM) const override;
   FX_TIMEZONE GetTimeZone() const override;
-  CFX_WideString GetEraName(bool bAD) const override;
+  WideString GetEraName(bool bAD) const override;
 
-  CFX_WideString GetDatePattern(
-      FX_LOCALEDATETIMESUBCATEGORY eType) const override;
-  CFX_WideString GetTimePattern(
-      FX_LOCALEDATETIMESUBCATEGORY eType) const override;
-  CFX_WideString GetNumPattern(FX_LOCALENUMSUBCATEGORY eType) const override;
+  WideString GetDatePattern(FX_LOCALEDATETIMESUBCATEGORY eType) const override;
+  WideString GetTimePattern(FX_LOCALEDATETIMESUBCATEGORY eType) const override;
+  WideString GetNumPattern(FX_LOCALENUMSUBCATEGORY eType) const override;
 
  private:
-  CFX_WideString GetPattern(CXML_Element* pElement,
-                            const CFX_ByteStringC& bsTag,
-                            const CFX_WideStringC& wsName) const;
-  CFX_WideString GetCalendarSymbol(const CFX_ByteStringC& symbol,
-                                   int index,
-                                   bool bAbbr) const;
+  WideString GetPattern(CXML_Element* pElement,
+                        const ByteStringView& bsTag,
+                        const WideStringView& wsName) const;
+  WideString GetCalendarSymbol(const ByteStringView& symbol,
+                               int index,
+                               bool bAbbr) const;
 
   std::unique_ptr<CXML_Element> m_pLocaleData;
 };
diff --git a/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp b/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp
index d4cd058b44..373412ebf9 100644
--- a/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp
+++ b/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp
@@ -73,7 +73,7 @@ void FormValueNode_MatchNoneCreateChild(CXFA_Node* pFormNode) {
 }
 
 bool FormValueNode_SetChildContent(CXFA_Node* pValueNode,
-                                   const CFX_WideString& wsContent,
+                                   const WideString& wsContent,
                                    XFA_Element iType = XFA_Element::Unknown) {
   if (!pValueNode)
     return false;
@@ -90,7 +90,7 @@ bool FormValueNode_SetChildContent(CXFA_Node* pValueNode,
       if (!pContentRawDataNode) {
         XFA_Element element = XFA_Element::Sharptext;
         if (pChildNode->GetElementType() == XFA_Element::ExData) {
-          CFX_WideString wsContentType;
+          WideString wsContentType;
           pChildNode->GetAttribute(XFA_ATTRIBUTE_ContentType, wsContentType,
                                    false);
           if (wsContentType == L"text/html")
@@ -131,13 +131,13 @@ void CreateDataBinding(CXFA_Node* pFormNode,
   XFA_Element eUIType = pWidgetData->GetUIType();
   CXFA_Value defValue(pFormNode->GetProperty(0, XFA_Element::Value));
   if (!bDataToForm) {
-    CFX_WideString wsValue;
-    CFX_WideString wsFormattedValue;
+    WideString wsValue;
+    WideString wsFormattedValue;
     switch (eUIType) {
       case XFA_Element::ImageEdit: {
         CXFA_Image image = defValue.GetImage();
-        CFX_WideString wsContentType;
-        CFX_WideString wsHref;
+        WideString wsContentType;
+        WideString wsHref;
         if (image) {
           image.GetContent(wsValue);
           image.GetContentType(wsContentType);
@@ -157,7 +157,7 @@ void CreateDataBinding(CXFA_Node* pFormNode,
       case XFA_Element::ChoiceList:
         defValue.GetChildValueContent(wsValue);
         if (pWidgetData->GetChoiceListOpen() == XFA_ATTRIBUTEENUM_MultiSelect) {
-          std::vector<CFX_WideString> wsSelTextArray =
+          std::vector<WideString> wsSelTextArray =
               pWidgetData->GetSelectedItemsValue();
           if (!wsSelTextArray.empty()) {
             for (const auto& text : wsSelTextArray) {
@@ -211,7 +211,7 @@ void CreateDataBinding(CXFA_Node* pFormNode,
           if (!pText)
             continue;
 
-          CFX_WideString wsContent;
+          WideString wsContent;
           if (pText->TryContent(wsContent) && (wsContent == wsValue)) {
             pChecked = pChild;
             wsFormattedValue = wsValue;
@@ -237,7 +237,7 @@ void CreateDataBinding(CXFA_Node* pFormNode,
           if (pText)
             pText = pText->GetNodeItem(XFA_NODEITEM_NextSibling);
 
-          CFX_WideString wsContent;
+          WideString wsContent;
           if (pText)
             pText->TryContent(wsContent);
 
@@ -250,7 +250,7 @@ void CreateDataBinding(CXFA_Node* pFormNode,
         if (wsValue.IsEmpty())
           break;
 
-        CFX_WideString wsOutput;
+        WideString wsOutput;
         pWidgetData->NormalizeNumStr(wsValue, wsOutput);
         wsValue = wsOutput;
         pWidgetData->GetFormatDataValue(wsValue, wsFormattedValue);
@@ -271,9 +271,9 @@ void CreateDataBinding(CXFA_Node* pFormNode,
     return;
   }
 
-  CFX_WideString wsXMLValue;
+  WideString wsXMLValue;
   pDataNode->TryContent(wsXMLValue);
-  CFX_WideString wsNormalizeValue;
+  WideString wsNormalizeValue;
   pWidgetData->GetNormalizeDataValue(wsXMLValue, wsNormalizeValue);
   pDataNode->SetAttributeValue(wsNormalizeValue, wsXMLValue);
   switch (eUIType) {
@@ -286,14 +286,14 @@ void CreateDataBinding(CXFA_Node* pFormNode,
             static_cast<CFX_XMLElement*>(pDataNode->GetXMLMappingNode());
         ASSERT(pXMLDataElement);
 
-        CFX_WideString wsContentType =
+        WideString wsContentType =
             pXMLDataElement->GetString(L"xfa:contentType");
         if (!wsContentType.IsEmpty()) {
           pDataNode->SetCData(XFA_ATTRIBUTE_ContentType, wsContentType);
           image.SetContentType(wsContentType);
         }
 
-        CFX_WideString wsHref = pXMLDataElement->GetString(L"href");
+        WideString wsHref = pXMLDataElement->GetString(L"href");
         if (!wsHref.IsEmpty())
           image.SetHref(wsHref);
       }
@@ -305,7 +305,7 @@ void CreateDataBinding(CXFA_Node* pFormNode,
         if (!items.empty()) {
           bool single = items.size() == 1;
           wsNormalizeValue.clear();
-          CFX_WideString wsItem;
+          WideString wsItem;
           for (CXFA_Node* pNode : items) {
             pNode->TryContent(wsItem);
             wsItem = single ? wsItem : wsItem + L"\n";
@@ -327,8 +327,8 @@ void CreateDataBinding(CXFA_Node* pFormNode,
                                     XFA_Element::Text);
       break;
     case XFA_Element::ExclGroup: {
-      pWidgetData->SetSelectedMemberByValue(wsNormalizeValue.AsStringC(), false,
-                                            false, false);
+      pWidgetData->SetSelectedMemberByValue(wsNormalizeValue.AsStringView(),
+                                            false, false, false);
       break;
     }
     case XFA_Element::DateTimeEdit:
@@ -336,10 +336,10 @@ void CreateDataBinding(CXFA_Node* pFormNode,
                                     XFA_Element::DateTime);
       break;
     case XFA_Element::NumericEdit: {
-      CFX_WideString wsPicture;
+      WideString wsPicture;
       pWidgetData->GetPictureContent(wsPicture, XFA_VALUEPICTURE_DataBind);
       if (wsPicture.IsEmpty()) {
-        CFX_WideString wsOutput;
+        WideString wsOutput;
         pWidgetData->NormalizeNumStr(wsNormalizeValue, wsOutput);
         wsNormalizeValue = wsOutput;
       }
@@ -407,7 +407,7 @@ CXFA_Node* ScopeMatchGlobalBinding(CXFA_Node* pDataScope,
 }
 
 CXFA_Node* FindGlobalDataNode(CXFA_Document* pDocument,
-                              CFX_WideStringC wsName,
+                              WideStringView wsName,
                               CXFA_Node* pDataScope,
                               XFA_Element eMatchNodeType) {
   if (wsName.IsEmpty())
@@ -425,7 +425,7 @@ CXFA_Node* FindGlobalDataNode(CXFA_Document* pDocument,
 }
 
 CXFA_Node* FindOnceDataNode(CXFA_Document* pDocument,
-                            CFX_WideStringC wsName,
+                            WideStringView wsName,
                             CXFA_Node* pDataScope,
                             XFA_Element eMatchNodeType) {
   if (wsName.IsEmpty())
@@ -452,7 +452,7 @@ CXFA_Node* FindOnceDataNode(CXFA_Document* pDocument,
 }
 
 CXFA_Node* FindDataRefDataNode(CXFA_Document* pDocument,
-                               CFX_WideStringC wsRef,
+                               WideStringView wsRef,
                                CXFA_Node* pDataScope,
                                XFA_Element eMatchNodeType,
                                CXFA_Node* pTemplateNode,
@@ -496,10 +496,10 @@ CXFA_Node* CloneOrMergeInstanceManager(CXFA_Document* pDocument,
                                        CXFA_Node* pFormParent,
                                        CXFA_Node* pTemplateNode,
                                        std::vector<CXFA_Node*>* subforms) {
-  CFX_WideStringC wsSubformName = pTemplateNode->GetCData(XFA_ATTRIBUTE_Name);
-  CFX_WideString wsInstMgrNodeName = L"_" + wsSubformName;
+  WideStringView wsSubformName = pTemplateNode->GetCData(XFA_ATTRIBUTE_Name);
+  WideString wsInstMgrNodeName = L"_" + wsSubformName;
   uint32_t dwInstNameHash =
-      FX_HashCode_GetW(wsInstMgrNodeName.AsStringC(), false);
+      FX_HashCode_GetW(wsInstMgrNodeName.AsStringView(), false);
   CXFA_Node* pExistingNode = XFA_DataMerge_FindFormDOMInstance(
       pDocument, XFA_Element::InstanceManager, dwInstNameHash, pFormParent);
   if (pExistingNode) {
@@ -1000,7 +1000,7 @@ CXFA_Node* CopyContainer_Field(CXFA_Document* pDocument,
 CXFA_Node* MaybeCreateDataNode(CXFA_Document* pDocument,
                                CXFA_Node* pDataParent,
                                XFA_Element eNodeType,
-                               const CFX_WideString& wsName) {
+                               const WideString& wsName) {
   if (!pDataParent)
     return nullptr;
 
@@ -1023,13 +1023,14 @@ CXFA_Node* MaybeCreateDataNode(CXFA_Document* pDocument,
       if (pDDGroupNode->GetElementType() != XFA_Element::DataGroup)
         continue;
 
-      CFX_WideString wsNamespace;
+      WideString wsNamespace;
       if (!pDDGroupNode->TryNamespace(wsNamespace) ||
           wsNamespace != L"http://ns.adobe.com/data-description/") {
         continue;
       }
     }
-    CXFA_Node* pDDNode = pDDGroupNode->GetFirstChildByName(wsName.AsStringC());
+    CXFA_Node* pDDNode =
+        pDDGroupNode->GetFirstChildByName(wsName.AsStringView());
     if (!pDDNode)
       continue;
     if (pDDNode->GetElementType() != eNodeType)
@@ -1086,7 +1087,7 @@ void UpdateBindingRelations(CXFA_Document* pDocument,
                                               : XFA_Element::DataValue;
               pDataNode = MaybeCreateDataNode(
                   pDocument, pDataScope, eDataNodeType,
-                  CFX_WideString(pFormNode->GetCData(XFA_ATTRIBUTE_Name)));
+                  WideString(pFormNode->GetCData(XFA_ATTRIBUTE_Name)));
               if (pDataNode)
                 CreateDataBinding(pFormNode, pDataNode, false);
             }
@@ -1118,7 +1119,7 @@ void UpdateBindingRelations(CXFA_Document* pDocument,
                   ToNode(pDocument->GetXFAObject(XFA_HASHCODE_Record));
               pDataNode = MaybeCreateDataNode(
                   pDocument, pRecordNode, eDataNodeType,
-                  CFX_WideString(pFormNode->GetCData(XFA_ATTRIBUTE_Name)));
+                  WideString(pFormNode->GetCData(XFA_ATTRIBUTE_Name)));
               if (pDataNode) {
                 CreateDataBinding(pFormNode, pDataNode, false);
                 RegisterGlobalBinding(pDocument, pFormNode->GetNameHash(),
@@ -1136,8 +1137,7 @@ void UpdateBindingRelations(CXFA_Document* pDocument,
         bMatchRef = bDataRef;
         bParentDataRef = true;
         if (!pDataNode && bDataRef) {
-          CFX_WideStringC wsRef =
-              pTemplateNodeBind->GetCData(XFA_ATTRIBUTE_Ref);
+          WideStringView wsRef = pTemplateNodeBind->GetCData(XFA_ATTRIBUTE_Ref);
           uint32_t dFlags =
               XFA_RESOLVENODE_Children | XFA_RESOLVENODE_CreateNode;
           XFA_RESOLVENODE_RS rs;
@@ -1197,7 +1197,7 @@ void UpdateDataRelation(CXFA_Node* pDataNode, CXFA_Node* pDataDescriptionNode) {
         if (pDDGroupNode->GetElementType() != XFA_Element::DataGroup)
           continue;
 
-        CFX_WideString wsNamespace;
+        WideString wsNamespace;
         if (!pDDGroupNode->TryNamespace(wsNamespace) ||
             wsNamespace != L"http://ns.adobe.com/data-description/") {
           continue;
@@ -1363,7 +1363,7 @@ void CXFA_Document::DoDataMerge() {
     pDatasetsRoot->SetXMLMappingNode(pDatasetsXMLNode);
   }
   CXFA_Node *pDataRoot = nullptr, *pDDRoot = nullptr;
-  CFX_WideString wsDatasetsURI;
+  WideString wsDatasetsURI;
   pDatasetsRoot->TryNamespace(wsDatasetsURI);
   for (CXFA_Node* pChildNode =
            pDatasetsRoot->GetNodeItem(XFA_NODEITEM_FirstChild);
@@ -1372,7 +1372,7 @@ void CXFA_Document::DoDataMerge() {
     if (pChildNode->GetElementType() != XFA_Element::DataGroup)
       continue;
 
-    CFX_WideString wsNamespaceURI;
+    WideString wsNamespaceURI;
     if (!pDDRoot && pChildNode->GetNameHash() == XFA_HASHCODE_DataDescription) {
       if (!pChildNode->TryNamespace(wsNamespaceURI))
         continue;
@@ -1435,9 +1435,8 @@ void CXFA_Document::DoDataMerge() {
       this, pFormRoot, pTemplateChosen, false, nullptr);
   ASSERT(pSubformSetNode);
   if (!pDataTopLevel) {
-    CFX_WideStringC wsFormName = pSubformSetNode->GetCData(XFA_ATTRIBUTE_Name);
-    CFX_WideString wsDataTopLevelName(wsFormName.IsEmpty() ? L"form"
-                                                           : wsFormName);
+    WideStringView wsFormName = pSubformSetNode->GetCData(XFA_ATTRIBUTE_Name);
+    WideString wsDataTopLevelName(wsFormName.IsEmpty() ? L"form" : wsFormName);
     CFX_XMLElement* pDataTopLevelXMLNode =
         new CFX_XMLElement(wsDataTopLevelName);
 
diff --git a/xfa/fxfa/parser/xfa_utils.cpp b/xfa/fxfa/parser/xfa_utils.cpp
index fa75f18015..e1ee29d2b7 100644
--- a/xfa/fxfa/parser/xfa_utils.cpp
+++ b/xfa/fxfa/parser/xfa_utils.cpp
@@ -39,8 +39,8 @@ const double fraction_scales[] = {0.1,
                                   0.000000000000001,
                                   0.0000000000000001};
 
-double WideStringToDouble(const CFX_WideString& wsStringVal) {
-  CFX_WideString wsValue = wsStringVal;
+double WideStringToDouble(const WideString& wsStringVal) {
+  WideString wsValue = wsStringVal;
   wsValue.TrimLeft();
   wsValue.TrimRight();
   int64_t nIntegral = 0;
@@ -172,15 +172,15 @@ CXFA_LocaleValue XFA_GetLocaleValue(CXFA_WidgetData* pWidgetData) {
                           pWidgetData->GetNode()->GetDocument()->GetLocalMgr());
 }
 void XFA_GetPlainTextFromRichText(CFX_XMLNode* pXMLNode,
-                                  CFX_WideString& wsPlainText) {
+                                  WideString& wsPlainText) {
   if (!pXMLNode) {
     return;
   }
   switch (pXMLNode->GetType()) {
     case FX_XMLNODE_Element: {
       CFX_XMLElement* pXMLElement = static_cast<CFX_XMLElement*>(pXMLNode);
-      CFX_WideString wsTag = pXMLElement->GetLocalTagName();
-      uint32_t uTag = FX_HashCode_GetW(wsTag.AsStringC(), true);
+      WideString wsTag = pXMLElement->GetLocalTagName();
+      uint32_t uTag = FX_HashCode_GetW(wsTag.AsStringView(), true);
       if (uTag == 0x0001f714) {
         wsPlainText += L"\n";
       } else if (uTag == 0x00000070) {
@@ -197,7 +197,7 @@ void XFA_GetPlainTextFromRichText(CFX_XMLNode* pXMLNode,
     }
     case FX_XMLNODE_Text:
     case FX_XMLNODE_CharData: {
-      CFX_WideString wsContent = static_cast<CFX_XMLText*>(pXMLNode)->GetText();
+      WideString wsContent = static_cast<CFX_XMLText*>(pXMLNode)->GetText();
       wsPlainText += wsContent;
       break;
     }
@@ -228,8 +228,8 @@ bool XFA_FieldIsMultiListBox(CXFA_Node* pFieldNode) {
   return bRet;
 }
 
-double XFA_ByteStringToDouble(const CFX_ByteStringC& szStringVal) {
-  CFX_WideString wsValue = CFX_WideString::FromUTF8(szStringVal);
+double XFA_ByteStringToDouble(const ByteStringView& szStringVal) {
+  WideString wsValue = WideString::FromUTF8(szStringVal);
   return WideStringToDouble(wsValue);
 }
 
@@ -241,7 +241,7 @@ int32_t XFA_MapRotation(int32_t nRotation) {
 
 const XFA_SCRIPTATTRIBUTEINFO* XFA_GetScriptAttributeByName(
     XFA_Element eElement,
-    const CFX_WideStringC& wsAttributeName) {
+    const WideStringView& wsAttributeName) {
   if (wsAttributeName.IsEmpty())
     return nullptr;
 
@@ -376,7 +376,7 @@ const XFA_ELEMENTINFO* XFA_GetElementByID(XFA_Element eName) {
              : nullptr;
 }
 
-XFA_Element XFA_GetElementTypeForName(const CFX_WideStringC& wsName) {
+XFA_Element XFA_GetElementTypeForName(const WideStringView& wsName) {
   if (wsName.IsEmpty())
     return XFA_Element::Unknown;
 
@@ -428,7 +428,7 @@ bool XFA_GetAttributeDefaultValue(void*& pValue,
   return false;
 }
 
-const XFA_ATTRIBUTEINFO* XFA_GetAttributeByName(const CFX_WideStringC& wsName) {
+const XFA_ATTRIBUTEINFO* XFA_GetAttributeByName(const WideStringView& wsName) {
   if (wsName.IsEmpty())
     return nullptr;
 
@@ -449,7 +449,7 @@ const XFA_ATTRIBUTEINFO* XFA_GetAttributeByID(XFA_ATTRIBUTE eName) {
 }
 
 const XFA_ATTRIBUTEENUMINFO* XFA_GetAttributeEnumByName(
-    const CFX_WideStringC& wsName) {
+    const WideStringView& wsName) {
   if (wsName.IsEmpty())
     return nullptr;
 
diff --git a/xfa/fxfa/parser/xfa_utils.h b/xfa/fxfa/parser/xfa_utils.h
index bc05381fc3..404586bd56 100644
--- a/xfa/fxfa/parser/xfa_utils.h
+++ b/xfa/fxfa/parser/xfa_utils.h
@@ -21,8 +21,8 @@ int XFA_GetMaxFractionalScale();
 
 bool XFA_FDEExtension_ResolveNamespaceQualifier(
     CFX_XMLElement* pNode,
-    const CFX_WideStringC& wsQualifier,
-    CFX_WideString* wsNamespaceURI);
+    const WideStringView& wsQualifier,
+    WideString* wsNamespaceURI);
 
 template <class NodeType, class TraverseStrategy>
 class CXFA_NodeIteratorTemplate {
@@ -144,12 +144,12 @@ class CXFA_NodeIteratorTemplate {
 };
 
 CXFA_LocaleValue XFA_GetLocaleValue(CXFA_WidgetData* pWidgetData);
-double XFA_ByteStringToDouble(const CFX_ByteStringC& szStringVal);
+double XFA_ByteStringToDouble(const ByteStringView& szStringVal);
 int32_t XFA_MapRotation(int32_t nRotation);
 
 bool XFA_RecognizeRichText(CFX_XMLElement* pRichTextXMLNode);
 void XFA_GetPlainTextFromRichText(CFX_XMLNode* pXMLNode,
-                                  CFX_WideString& wsPlainText);
+                                  WideString& wsPlainText);
 bool XFA_FieldIsMultiListBox(CXFA_Node* pFieldNode);
 
 void XFA_DataExporter_DealWithDataGroupNode(CXFA_Node* pDataNode);
@@ -166,7 +166,7 @@ const XFA_NOTSUREATTRIBUTE* XFA_GetNotsureAttribute(
 
 const XFA_SCRIPTATTRIBUTEINFO* XFA_GetScriptAttributeByName(
     XFA_Element eElement,
-    const CFX_WideStringC& wsAttributeName);
+    const WideStringView& wsAttributeName);
 
 const XFA_PROPERTY* XFA_GetPropertyOfElement(XFA_Element eElement,
                                              XFA_Element eProperty,
@@ -175,7 +175,7 @@ const XFA_PROPERTY* XFA_GetElementProperties(XFA_Element eElement,
                                              int32_t& iCount);
 const uint8_t* XFA_GetElementAttributes(XFA_Element eElement, int32_t& iCount);
 const XFA_ELEMENTINFO* XFA_GetElementByID(XFA_Element eName);
-XFA_Element XFA_GetElementTypeForName(const CFX_WideStringC& wsName);
+XFA_Element XFA_GetElementTypeForName(const WideStringView& wsName);
 CXFA_Measurement XFA_GetAttributeDefaultValue_Measure(XFA_Element eElement,
                                                       XFA_ATTRIBUTE eAttribute,
                                                       uint32_t dwPacket);
@@ -184,10 +184,10 @@ bool XFA_GetAttributeDefaultValue(void*& pValue,
                                   XFA_ATTRIBUTE eAttribute,
                                   XFA_ATTRIBUTETYPE eType,
                                   uint32_t dwPacket);
-const XFA_ATTRIBUTEINFO* XFA_GetAttributeByName(const CFX_WideStringC& wsName);
+const XFA_ATTRIBUTEINFO* XFA_GetAttributeByName(const WideStringView& wsName);
 const XFA_ATTRIBUTEINFO* XFA_GetAttributeByID(XFA_ATTRIBUTE eName);
 const XFA_ATTRIBUTEENUMINFO* XFA_GetAttributeEnumByName(
-    const CFX_WideStringC& wsName);
+    const WideStringView& wsName);
 const XFA_PACKETINFO* XFA_GetPacketByIndex(XFA_PACKET ePacket);
 const XFA_PACKETINFO* XFA_GetPacketByID(uint32_t dwPacket);