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diff --git a/Source/WebCore/html/HTMLDocument.h b/Source/WebCore/html/HTMLDocument.h
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+++ b/Source/WebCore/html/HTMLDocument.h
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+/*
+ * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
+ *           (C) 1999 Antti Koivisto (koivisto@kde.org)
+ * Copyright (C) 2004, 2006, 2007, 2008, 2009 Apple Inc. 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.
+ *
+ */
+
+#ifndef HTMLDocument_h
+#define HTMLDocument_h
+
+#include "CachedResourceClient.h"
+#include "Document.h"
+#include <wtf/HashCountedSet.h>
+
+namespace WebCore {
+
+class HTMLDocument : public Document, public CachedResourceClient {
+public:
+    static Ref<HTMLDocument> create(Frame* frame, const URL& url)
+    {
+        return adoptRef(*new HTMLDocument(frame, url, HTMLDocumentClass));
+    }
+
+    static Ref<HTMLDocument> createSynthesizedDocument(Frame* frame, const URL& url)
+    {
+        return adoptRef(*new HTMLDocument(frame, url, HTMLDocumentClass, Synthesized));
+    }
+
+    virtual ~HTMLDocument();
+
+    int width();
+    int height();
+
+    const AtomicString& dir() const;
+    void setDir(const AtomicString&);
+
+    String designMode() const;
+    void setDesignMode(const String&);
+
+    const AtomicString& bgColor() const;
+    void setBgColor(const String&);
+    const AtomicString& fgColor() const;
+    void setFgColor(const String&);
+    const AtomicString& alinkColor() const;
+    void setAlinkColor(const String&);
+    const AtomicString& linkColor() const;
+    void setLinkColor(const String&);
+    const AtomicString& vlinkColor() const;
+    void setVlinkColor(const String&);
+
+    void clear();
+
+    void captureEvents();
+    void releaseEvents();
+
+    Element* documentNamedItem(const AtomicStringImpl& name) const { return m_documentNamedItem.getElementByDocumentNamedItem(name, *this); }
+    bool hasDocumentNamedItem(const AtomicStringImpl& name) const { return m_documentNamedItem.contains(name); }
+    bool documentNamedItemContainsMultipleElements(const AtomicStringImpl& name) const { return m_documentNamedItem.containsMultiple(name); }
+    void addDocumentNamedItem(const AtomicStringImpl&, Element&);
+    void removeDocumentNamedItem(const AtomicStringImpl&, Element&);
+
+    Element* windowNamedItem(const AtomicStringImpl& name) const { return m_windowNamedItem.getElementByWindowNamedItem(name, *this); }
+    bool hasWindowNamedItem(const AtomicStringImpl& name) const { return m_windowNamedItem.contains(name); }
+    bool windowNamedItemContainsMultipleElements(const AtomicStringImpl& name) const { return m_windowNamedItem.containsMultiple(name); }
+    void addWindowNamedItem(const AtomicStringImpl&, Element&);
+    void removeWindowNamedItem(const AtomicStringImpl&, Element&);
+
+    static bool isCaseSensitiveAttribute(const QualifiedName&);
+
+protected:
+    HTMLDocument(Frame*, const URL&, DocumentClassFlags = 0, unsigned constructionFlags = 0);
+
+private:
+    virtual RefPtr<Element> createElement(const AtomicString& tagName, ExceptionCode&) override;
+
+    virtual bool isFrameSet() const override;
+    virtual Ref<DocumentParser> createParser() override;
+    virtual Ref<Document> cloneDocumentWithoutChildren() const override final;
+
+    DocumentOrderedMap m_documentNamedItem;
+    DocumentOrderedMap m_windowNamedItem;
+};
+
+} // namespace WebCore
+
+SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::HTMLDocument)
+    static bool isType(const WebCore::Document& document) { return document.isHTMLDocument(); }
+    static bool isType(const WebCore::Node& node) { return is<WebCore::Document>(node) && isType(downcast<WebCore::Document>(node)); }
+SPECIALIZE_TYPE_TRAITS_END()
+
+#endif // HTMLDocument_h