:hover style not applied on hover if its display property is different from original style's

Source/core/dom/ContainerNode.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010, 2011 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.
@@ skipping 96 matching lines @@
     // However, arbitrary code may be run by beforeload handlers.
     void parserAppendChild(PassRefPtr<Node>);
     void parserRemoveChild(Node*);
     void parserInsertBefore(PassRefPtr<Node> newChild, Node* refChild);
 
     void removeChildren();
     void takeAllChildrenFrom(ContainerNode*);
 
     void cloneChildNodes(ContainerNode* clone);
 
-    virtual void attach() OVERRIDE;
-    virtual void detach() OVERRIDE;
+    virtual void attach(const AttachContext& = AttachContext()) OVERRIDE;
+    virtual void detach(const AttachContext& = AttachContext()) OVERRIDE;
     virtual void setFocus(bool) OVERRIDE;
     virtual void setActive(bool active = true, bool pause = false) OVERRIDE;
     virtual void setHovered(bool = true) OVERRIDE;
 
     // -----------------------------------------------------------------------------
     // Notification of document structure changes (see core/dom/Node.h for more notification methods)
 
     // Notifies the node that it's list of children have changed (either by adding or removing child nodes), or a child
     // node that is of the type CDATA_SECTION_NODE, TEXT_NODE or COMMENT_NODE has changed its value.
     virtual void childrenChanged(bool createdByParser = false, Node* beforeChange = 0, Node* afterChange = 0, int childCountDelta = 0);
@@ skipping 254 matching lines @@
         m_node->resumePostAttachCallbacks();
     }
 
 private:
     ContainerNode* m_node;
 };
 
 } // namespace WebCore
 
 #endif // ContainerNode_h