Implement select listbox using shadow DOM

Source/core/dom/NodeRenderStyle.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2008 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 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
@@ skipping 19 matching lines @@
 #include "core/html/HTMLOptGroupElement.h"
 #include "core/rendering/RenderObject.h"
 #include "core/rendering/style/RenderStyle.h"
 
 namespace WebCore {
 
 inline RenderStyle* Node::renderStyle() const
 {
     if (RenderObject* renderer = this->renderer())
         return renderer->style();
-    // <option> and <optgroup> can be styled even though they never get renderers,
+    // <option> and <optgroup> can be styled even if they don't get renderers,
     // so they store their style internally and return it through nonRendererStyle().
     // We check here explicitly to avoid the virtual call in the common case.
     if (isHTMLOptGroupElement(*this) || isHTMLOptionElement(this))
         return nonRendererStyle();
     return 0;
 }
 
 inline RenderStyle* Node::parentRenderStyle() const
 {
     ContainerNode* parent = NodeRenderingTraversal::parent(this);
     return parent ? parent->renderStyle() : 0;
 }
 
 }
 #endif