ClassRootNodeList should start from rootNode, not the first child of rootNode.

Source/core/dom/SelectorQuery.cpp

 /*
  * Copyright (C) 2011 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 46 matching lines @@
         m_currentNode = 0;
         return current;
     }
 
 private:
     Node* m_currentNode;
 };
 
 class ClassRootNodeList : public SimpleNodeList {
 public:
     explicit ClassRootNodeList(Node* rootNode, const AtomicString& className)

[haraken, 2013/10/07 07:08:49]

Nit: 'explicit' is not needed.

[tasak, 2013/10/07 07:34:34]

Done.

         : m_className(className)
         , m_rootNode(rootNode)
-        , m_currentElement(nextInternal(ElementTraversal::firstWithin(rootNode))) { }
+        , m_currentElement(nextInternal(rootNode && rootNode->isElementNode() ? toElement(rootNode) : ElementTraversal::firstWithin(rootNode))) { }
 
     bool isEmpty() const { return !m_currentElement; }
 
     Node* next()
     {
         Node* current = m_currentElement;
         ASSERT(current);
         m_currentElement = nextInternal(ElementTraversal::nextSkippingChildren(m_currentElement, m_rootNode));
         return current;
     }
@@ skipping 429 matching lines @@
     m_entries.add(selectors, selectorQuery.release());
     return rawSelectorQuery;
 }
 
 void SelectorQueryCache::invalidate()
 {
     m_entries.clear();
 }
 
 }