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

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

 /*
  * Copyright (c) 2010 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 48 matching lines @@
 {
     DEFINE_STATIC_LOCAL(const AtomicString, output, ("output"));
     return output;
 }
 
 bool HTMLOutputElement::isDisabledFormControl() const
 {
     return false;
 }
 
+bool HTMLOutputElement::matchesEnabledPseudoClass() const
+{
+    return false;
+}
+
 bool HTMLOutputElement::supportsFocus() const
 {
     return HTMLElement::supportsFocus();
 }
 
 void HTMLOutputElement::parseAttribute(const QualifiedName& name, const AtomicString& oldValue, const AtomicString& value)
 {
     if (name == HTMLNames::forAttr)
         setFor(value);
     else
@@ skipping 66 matching lines @@
 
 
 DEFINE_TRACE(HTMLOutputElement)
 {
     visitor->trace(m_tokens);
     HTMLFormControlElement::trace(visitor);
     DOMTokenListObserver::trace(visitor);
 }
 
 } // namespace blink