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diff --git a/Source/WebCore/css/parser/CSSParser.h b/Source/WebCore/css/parser/CSSParser.h
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+++ b/Source/WebCore/css/parser/CSSParser.h
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+/*
+ * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
+ * Copyright (C) 2004-2010, 2015 Apple Inc. All rights reserved.
+ * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
+ * Copyright (C) 2009 - 2010  Torch Mobile (Beijing) Co. Ltd. All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#pragma once
+
+#include "CSSParserMode.h"
+#include "CSSValue.h"
+#include "WritingMode.h"
+#include <wtf/text/WTFString.h>
+
+namespace WebCore {
+
+class CSSParserObserver;
+class CSSSelectorList;
+class Color;
+class Element;
+class ImmutableStyleProperties;
+class MutableStyleProperties;
+class StyleRuleBase;
+class StyleRuleKeyframe;
+class StyleSheetContents;
+
+class CSSParser {
+public:
+    enum class ParseResult {
+        Changed,
+        Unchanged,
+        Error
+    };
+
+    WEBCORE_EXPORT explicit CSSParser(const CSSParserContext&);
+    WEBCORE_EXPORT ~CSSParser();
+
+    enum class RuleParsing { Normal, Deferred };
+    void parseSheet(StyleSheetContents*, const String&, RuleParsing = RuleParsing::Normal);
+    
+    static RefPtr<StyleRuleBase> parseRule(const CSSParserContext&, StyleSheetContents*, const String&);
+    
+    RefPtr<StyleRuleKeyframe> parseKeyframeRule(const String&);
+    static std::unique_ptr<Vector<double>> parseKeyframeKeyList(const String&);
+    
+    bool parseSupportsCondition(const String&);
+
+    static void parseSheetForInspector(const CSSParserContext&, StyleSheetContents*, const String&, CSSParserObserver&);
+    static void parseDeclarationForInspector(const CSSParserContext&, const String&, CSSParserObserver&);
+
+    static ParseResult parseValue(MutableStyleProperties&, CSSPropertyID, const String&, bool important, const CSSParserContext&);
+    static ParseResult parseCustomPropertyValue(MutableStyleProperties&, const AtomicString& propertyName, const String&, bool important, const CSSParserContext&);
+    
+    static RefPtr<CSSValue> parseFontFaceDescriptor(CSSPropertyID, const String&, const CSSParserContext&);
+
+    static RefPtr<CSSValue> parseSingleValue(CSSPropertyID, const String&, const CSSParserContext& = strictCSSParserContext());
+
+    WEBCORE_EXPORT bool parseDeclaration(MutableStyleProperties&, const String&);
+    static Ref<ImmutableStyleProperties> parseInlineStyleDeclaration(const String&, Element*);
+
+    void parseSelector(const String&, CSSSelectorList&);
+
+    RefPtr<CSSValue> parseValueWithVariableReferences(CSSPropertyID, const CSSValue&, const CustomPropertyValueMap& customProperties, TextDirection, WritingMode);
+
+    static Color parseColor(const String&, bool strict = false);
+    static Color parseSystemColor(const String&, Document*);
+
+private:
+    ParseResult parseValue(MutableStyleProperties&, CSSPropertyID, const String&, bool important);
+
+    CSSParserContext m_context;
+};
+
+} // namespace WebCore