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

Source/core/html/HTMLFormControlElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 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 94 matching lines @@
     using Node::deref;
 
     virtual void reportMemoryUsage(MemoryObjectInfo*) const OVERRIDE;
 
 protected:
     HTMLFormControlElement(const QualifiedName& tagName, Document*, HTMLFormElement*);
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     virtual void requiredAttributeChanged();
     virtual void disabledAttributeChanged();
-    virtual void attach();
+    virtual void attach(const AttachContext& = AttachContext()) OVERRIDE;
     virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
     virtual void removedFrom(ContainerNode*) OVERRIDE;
     virtual void didMoveToNewDocument(Document* oldDocument) OVERRIDE;
 
     virtual bool supportsFocus() const;
     virtual bool isKeyboardFocusable(KeyboardEvent*) const;
     virtual bool isMouseFocusable() const;
 
     virtual void didRecalcStyle(StyleChange) OVERRIDE;
 
@@ skipping 41 matching lines @@
     bool m_isValid : 1;
 
     bool m_wasChangedSinceLastFormControlChangeEvent : 1;
 
     bool m_hasAutofocused : 1;
 };
 
 } // namespace
 
 #endif