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diff --git a/xfa/fde/css/cfde_cssstyleselector.h b/xfa/fde/css/cfde_cssstyleselector.h
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+++ b/xfa/fde/css/cfde_cssstyleselector.h
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+// Copyright 2017 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef XFA_FDE_CSS_CFDE_CSSSTYLESELECTOR_H_
+#define XFA_FDE_CSS_CFDE_CSSSTYLESELECTOR_H_
+
+#include <memory>
+#include <vector>
+
+#include "core/fxcrt/fx_basic.h"
+#include "core/fxcrt/fx_system.h"
+#include "xfa/fde/css/cfde_cssrulecollection.h"
+#include "xfa/fde/css/fde_css.h"
+
+class CFDE_CSSAccelerator;
+class CFDE_CSSComputedStyle;
+class CFDE_CSSDeclaration;
+class CFDE_CSSSelector;
+class CFDE_CSSStyleSheet;
+class CFDE_CSSTagCache;
+class CFDE_CSSValue;
+class CFDE_CSSValueList;
+class CFGAS_FontMgr;
+class CXFA_CSSTagProvider;
+
+class CFDE_CSSStyleSelector {
+ public:
+  explicit CFDE_CSSStyleSelector(CFGAS_FontMgr* pFontMgr);
+  ~CFDE_CSSStyleSelector();
+
+  void SetDefFontSize(FX_FLOAT fFontSize);
+
+  bool SetStyleSheet(FDE_CSSStyleSheetGroup eType, CFDE_CSSStyleSheet* pSheet);
+  bool SetStyleSheets(FDE_CSSStyleSheetGroup eType,
+                      const CFX_ArrayTemplate<CFDE_CSSStyleSheet*>* pArray);
+  void SetStylePriority(FDE_CSSStyleSheetGroup eType,
+                        FDE_CSSStyleSheetPriority ePriority);
+  void UpdateStyleIndex(uint32_t dwMediaList);
+  CFDE_CSSAccelerator* InitAccelerator();
+  CFDE_CSSComputedStyle* CreateComputedStyle(
+      CFDE_CSSComputedStyle* pParentStyle);
+  int32_t MatchDeclarations(
+      CXFA_CSSTagProvider* pTag,
+      CFX_ArrayTemplate<CFDE_CSSDeclaration*>& matchedDecls,
+      FDE_CSSPseudo ePseudoType = FDE_CSSPseudo::NONE);
+  void ComputeStyle(CXFA_CSSTagProvider* pTag,
+                    const CFDE_CSSDeclaration** ppDeclArray,
+                    int32_t iDeclCount,
+                    CFDE_CSSComputedStyle* pDestStyle);
+
+ protected:
+  void Reset();
+  void MatchRules(CFDE_CSSTagCache* pCache,
+                  CFDE_CSSRuleCollection::Data* pList,
+                  FDE_CSSPseudo ePseudoType);
+  bool MatchSelector(CFDE_CSSTagCache* pCache,
+                     CFDE_CSSSelector* pSel,
+                     FDE_CSSPseudo ePseudoType);
+  void AppendInlineStyle(CFDE_CSSDeclaration* pDecl,
+                         const FX_WCHAR* psz,
+                         int32_t iLen);
+  void ApplyDeclarations(bool bPriority,
+                         const CFDE_CSSDeclaration** ppDeclArray,
+                         int32_t iDeclCount,
+                         CFDE_CSSComputedStyle* pDestStyle);
+  void ApplyProperty(FDE_CSSProperty eProperty,
+                     CFDE_CSSValue* pValue,
+                     CFDE_CSSComputedStyle* pComputedStyle);
+
+  bool SetLengthWithPercent(FDE_CSSLength& width,
+                            FDE_CSSPrimitiveType eType,
+                            CFDE_CSSValue* pValue,
+                            FX_FLOAT fFontSize);
+  FX_FLOAT ToFontSize(FDE_CSSPropertyValue eValue, FX_FLOAT fCurFontSize);
+  FDE_CSSDisplay ToDisplay(FDE_CSSPropertyValue eValue);
+  FDE_CSSTextAlign ToTextAlign(FDE_CSSPropertyValue eValue);
+  uint16_t ToFontWeight(FDE_CSSPropertyValue eValue);
+  FDE_CSSFontStyle ToFontStyle(FDE_CSSPropertyValue eValue);
+  FDE_CSSVerticalAlign ToVerticalAlign(FDE_CSSPropertyValue eValue);
+  uint32_t ToTextDecoration(CFDE_CSSValueList* pList);
+  FDE_CSSFontVariant ToFontVariant(FDE_CSSPropertyValue eValue);
+
+  CFGAS_FontMgr* const m_pFontMgr;
+  FX_FLOAT m_fDefFontSize;
+  CFX_ArrayTemplate<CFDE_CSSStyleSheet*> m_SheetGroups[3];
+  CFDE_CSSRuleCollection m_RuleCollection[3];
+  FDE_CSSStyleSheetGroup m_ePriorities[3];
+  std::unique_ptr<CFDE_CSSAccelerator> m_pAccelerator;
+  std::vector<CFDE_CSSRuleCollection::Data*> m_MatchedRules;
+};
+
+#endif  // XFA_FDE_CSS_CFDE_CSSSTYLESELECTOR_H_