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diff --git a/WebCore/rendering/RenderRuby.h b/WebCore/rendering/RenderRuby.h
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+/*
+ * Copyright (C) 2009 Google 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.
+ */
+
+#ifndef RenderRuby_h
+#define RenderRuby_h
+
+#include "RenderBlock.h"
+#include "RenderInline.h"
+
+namespace WebCore {
+
+// Following the HTML 5 spec, the box object model for a <ruby> element allows several runs of ruby
+// bases with their respective ruby texts looks as follows:
+//
+// 1 RenderRuby object, corresponding to the whole <ruby> HTML element
+//      1+ RenderRubyRun (anonymous)
+//          0 or 1 RenderRubyText - shuffled to the front in order to re-use existing block layouting
+//              0-n inline object(s)
+//          0 or 1 RenderRubyBase - contains the inline objects that make up the ruby base
+//              1-n inline object(s)
+//
+// Note: <rp> elements are defined as having 'display:none' and thus normally are not assigned a renderer.
+
+// <ruby> when used as 'display:inline'
+class RenderRubyAsInline : public RenderInline {
+public:
+    RenderRubyAsInline(Node*);
+    virtual ~RenderRubyAsInline();
+
+    virtual const char* renderName() const { return "RenderRuby (inline)"; }
+
+    virtual bool isRuby() const { return true; }
+
+    virtual bool isChildAllowed(RenderObject*, RenderStyle*) const;
+    virtual void addChild(RenderObject* child, RenderObject* beforeChild = 0);
+    virtual void removeChild(RenderObject* child);
+};
+
+// <ruby> when used as 'display:block' or 'display:inline-block'
+class RenderRubyAsBlock : public RenderBlock {
+public:
+    RenderRubyAsBlock(Node*);
+    virtual ~RenderRubyAsBlock();
+
+    virtual const char* renderName() const { return "RenderRuby (block)"; }
+
+    virtual bool isRuby() const { return true; }
+
+    virtual bool isChildAllowed(RenderObject*, RenderStyle*) const;
+    virtual void addChild(RenderObject* child, RenderObject* beforeChild = 0);
+    virtual void removeChild(RenderObject* child);
+};
+
+} // namespace WebCore
+
+#endif // RenderRuby_h