Support :hover/:active in quirks when leftmost in compound.

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 762 matching lines @@
     case CSSSelector::PseudoFocus:
         if (m_mode == ResolvingStyle) {
             if (context.elementStyle)
                 context.elementStyle->setAffectedByFocus();
             else
                 element.setChildrenOrSiblingsAffectedByFocus();
         }
         return matchesFocusPseudoClass(element);
     case CSSSelector::PseudoHover:
         // If we're in quirks mode, then hover should never match anchors with no
         // href and *:hover should not match anything. This is important for sites like wsj.com.

[kochi, 2015/01/15 10:04:11]

Could you move this comment and the comment for PseudoActive (line796)
into header and update with the link for quirks spec?

[rune, 2015/01/15 10:29:02]

Done.

I removed the reference to wsj.com since that site is using strict mode now.

-        if (m_strictParsing || context.isSubSelector || element.isLink()) {
+        if (shouldMatchHoverOrActive(context)) {
             if (m_mode == ResolvingStyle) {
                 if (context.elementStyle)
                     context.elementStyle->setAffectedByHover();
                 else
                     element.setChildrenOrSiblingsAffectedByHover();
             }
             if (element.hovered() || InspectorInstrumentation::forcePseudoState(&element, CSSSelector::PseudoHover))
                 return true;
         }
         break;
     case CSSSelector::PseudoActive:
         // If we're in quirks mode, then :active should never match anchors with no
         // href and *:active should not match anything.
-        if (m_strictParsing || context.isSubSelector || element.isLink()) {
+        if (shouldMatchHoverOrActive(context)) {
             if (m_mode == ResolvingStyle) {
                 if (context.elementStyle)
                     context.elementStyle->setAffectedByActive();
                 else
                     element.setChildrenOrSiblingsAffectedByActive();
             }
             if (element.active() || InspectorInstrumentation::forcePseudoState(&element, CSSSelector::PseudoActive))
                 return true;
         }
         break;
@@ skipping 364 matching lines @@
     return isHTMLSelectElement(element) && !toHTMLSelectElement(element).usesMenuList();
 }
 
 template
 SelectorChecker::Match SelectorChecker::match(const SelectorCheckingContext&, const DOMSiblingTraversalStrategy&, MatchResult*) const;
 
 template
 SelectorChecker::Match SelectorChecker::match(const SelectorCheckingContext&, const ShadowDOMSiblingTraversalStrategy&, MatchResult*) const;
 
 }