output should not match to :enabled or :disabled pseudo classes.

third_party/WebKit/Source/core/html/HTMLFormControlElement.cpp

 /*
  * 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 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * 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 350 matching lines @@
 bool HTMLFormControlElement::isDisabledFormControl() const
 {
     if (fastHasAttribute(disabledAttr))
         return true;
 
     if (m_ancestorDisabledState == AncestorDisabledStateUnknown)
         updateAncestorDisabledState();
     return m_ancestorDisabledState == AncestorDisabledStateDisabled;
 }
 
+bool HTMLFormControlElement::matchesEnabledPseudoClass() const
+{
+    return !isDisabledFormControl();
+}
+
 bool HTMLFormControlElement::isRequired() const
 {
     return fastHasAttribute(requiredAttr);
 }
 
 String HTMLFormControlElement::resultForDialogSubmit()
 {
     return fastGetAttribute(valueAttr);
 }
 
@@ skipping 277 matching lines @@
         dispatchFormControlChangeEvent();
 }
 
 void HTMLFormControlElement::copyNonAttributePropertiesFromElement(const Element& source)
 {
     HTMLElement::copyNonAttributePropertiesFromElement(source);
     setNeedsValidityCheck();
 }
 
 } // namespace blink