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

third_party/WebKit/Source/core/css/SelectorChecker.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 805 matching lines @@
                 m_elementStyle->setUnique();
                 element.setChildrenOrSiblingsAffectedByActive();
             }
         }
         if (!shouldMatchHoverOrActive(context))
             return false;
         if (InspectorInstrumentation::forcePseudoState(&element, CSSSelector::PseudoActive))
             return true;
         return element.active();
     case CSSSelector::PseudoEnabled:
-        if (element.isFormControlElement() || isHTMLOptionElement(element) || isHTMLOptGroupElement(element))
+        if ((element.isFormControlElement() && !isHTMLOutputElement(element)) || isHTMLOptionElement(element) || isHTMLOptGroupElement(element))

[tkent, 2016/04/25 09:40:40]

This is not a good change.  We should not add more element-specific logic to
SelectorChecker.

Please add Element::matchesEnabledPseudoClass(), and override it in
FormControlElement, HTMLOptionElement, HTMLOptGroupElement, and
HTMLOutputElement.

[ramya.v, 2016/04/25 14:47:29]

Done.

             return !element.isDisabledFormControl();
         if (isHTMLAnchorElement(element) || isHTMLAreaElement(element))
             return element.isLink();
         break;
     case CSSSelector::PseudoFullPageMedia:
         return element.document().isMediaDocument();
     case CSSSelector::PseudoDefault:
         return element.matchesDefaultPseudoClass();
     case CSSSelector::PseudoDisabled:
         // TODO(esprehn): Why not just always return isDisabledFormControl()?
@@ skipping 306 matching lines @@
 }
 
 bool SelectorChecker::matchesFocusPseudoClass(const Element& element)
 {
     if (InspectorInstrumentation::forcePseudoState(const_cast<Element*>(&element), CSSSelector::PseudoFocus))
         return true;
     return element.focused() && isFrameFocused(element);
 }
 
 } // namespace blink