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diff --git a/Source/WebCore/css/parser/CSSParserIdioms.h b/Source/WebCore/css/parser/CSSParserIdioms.h
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+++ b/Source/WebCore/css/parser/CSSParserIdioms.h
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+/*
+ * Copyright (C) 2013 Google Inc. All rights reserved.
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "CSSParserMode.h"
+#include <wtf/ASCIICType.h>
+#include <wtf/text/StringView.h>
+
+namespace WebCore {
+
+class URL;
+    
+// Space characters as defined by the CSS specification.
+// http://www.w3.org/TR/css3-syntax/#whitespace
+inline bool isCSSSpace(UChar c)
+{
+    return c == ' ' || c == '\t' || c == '\n';
+}
+
+// http://dev.w3.org/csswg/css-syntax/#name-start-code-point
+template <typename CharacterType>
+bool isNameStartCodePoint(CharacterType c)
+{
+    return isASCIIAlpha(c) || c == '_' || !isASCII(c);
+}
+
+// http://dev.w3.org/csswg/css-syntax/#name-code-point
+template <typename CharacterType>
+bool isNameCodePoint(CharacterType c)
+{
+    return isNameStartCodePoint(c) || isASCIIDigit(c) || c == '-';
+}
+
+bool isValueAllowedInMode(unsigned short, CSSParserMode);
+
+URL completeURL(const CSSParserContext&, const String& url);
+
+} // namespace WebCore