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diff --git a/core/fxcrt/css/cfx_cssstyleselector.h b/core/fxcrt/css/cfx_cssstyleselector.h
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+++ b/core/fxcrt/css/cfx_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 CORE_FXCRT_CSS_CFX_CSSSTYLESELECTOR_H_
+#define CORE_FXCRT_CSS_CFX_CSSSTYLESELECTOR_H_
+
+#include <memory>
+#include <vector>
+
+#include "core/fxcrt/css/cfx_css.h"
+#include "core/fxcrt/css/cfx_cssrulecollection.h"
+#include "core/fxcrt/fx_basic.h"
+#include "core/fxcrt/fx_system.h"
+
+class CFX_CSSComputedStyle;
+class CFX_CSSCustomProperty;
+class CFX_CSSDeclaration;
+class CFX_CSSPropertyHolder;
+class CFX_CSSSelector;
+class CFX_CSSStyleSheet;
+class CFX_CSSValue;
+class CFX_CSSValueList;
+
+class CFX_CSSStyleSelector {
+ public:
+  CFX_CSSStyleSelector();
+  ~CFX_CSSStyleSelector();
+
+  void SetDefFontSize(float fFontSize);
+  void SetUAStyleSheet(std::unique_ptr<CFX_CSSStyleSheet> pSheet);
+  void UpdateStyleIndex();
+
+  CFX_RetainPtr<CFX_CSSComputedStyle> CreateComputedStyle(
+      CFX_CSSComputedStyle* pParentStyle);
+
+  // Note, the dest style has to be an out param because the CXFA_TextParser
+  // adds non-inherited data from the parent style. Attempting to copy
+  // internally will fail as you'll lose the non-inherited data.
+  void ComputeStyle(const std::vector<const CFX_CSSDeclaration*>& declArray,
+                    const CFX_WideString& styleString,
+                    const CFX_WideString& alignString,
+                    CFX_CSSComputedStyle* pDestStyle);
+
+  std::vector<const CFX_CSSDeclaration*> MatchDeclarations(
+      const CFX_WideString& tagname);
+
+ private:
+  bool MatchSelector(const CFX_WideString& tagname, CFX_CSSSelector* pSel);
+
+  void AppendInlineStyle(CFX_CSSDeclaration* pDecl,
+                         const CFX_WideString& style);
+  void ApplyDeclarations(
+      const std::vector<const CFX_CSSDeclaration*>& declArray,
+      const CFX_CSSDeclaration* extraDecl,
+      CFX_CSSComputedStyle* pDestStyle);
+  void ApplyProperty(CFX_CSSProperty eProperty,
+                     const CFX_RetainPtr<CFX_CSSValue>& pValue,
+                     CFX_CSSComputedStyle* pComputedStyle);
+  void ExtractValues(const CFX_CSSDeclaration* decl,
+                     std::vector<const CFX_CSSPropertyHolder*>* importants,
+                     std::vector<const CFX_CSSPropertyHolder*>* normals,
+                     std::vector<const CFX_CSSCustomProperty*>* custom);
+
+  bool SetLengthWithPercent(CFX_CSSLength& width,
+                            CFX_CSSPrimitiveType eType,
+                            const CFX_RetainPtr<CFX_CSSValue>& pValue,
+                            float fFontSize);
+  float ToFontSize(CFX_CSSPropertyValue eValue, float fCurFontSize);
+  CFX_CSSDisplay ToDisplay(CFX_CSSPropertyValue eValue);
+  CFX_CSSTextAlign ToTextAlign(CFX_CSSPropertyValue eValue);
+  uint16_t ToFontWeight(CFX_CSSPropertyValue eValue);
+  CFX_CSSFontStyle ToFontStyle(CFX_CSSPropertyValue eValue);
+  CFX_CSSVerticalAlign ToVerticalAlign(CFX_CSSPropertyValue eValue);
+  uint32_t ToTextDecoration(const CFX_RetainPtr<CFX_CSSValueList>& pList);
+  CFX_CSSFontVariant ToFontVariant(CFX_CSSPropertyValue eValue);
+
+  float m_fDefFontSize;
+  std::unique_ptr<CFX_CSSStyleSheet> m_UAStyles;
+  CFX_CSSRuleCollection m_UARules;
+};
+
+#endif  // CORE_FXCRT_CSS_CFX_CSSSTYLESELECTOR_H_