Pseudo element ids != NOPSEUDO only in rightmost compound.

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 1021 matching lines @@
             return false;
         }
     case CSSSelector::PseudoContent:
         return element.isInShadowTree() && element.isInsertionPoint();
     case CSSSelector::PseudoShadow:
         return element.isInShadowTree() && context.previousElement;
     default:
         break;
     }
 
-    if (!context.inRightmostCompound && m_mode == ResolvingStyle)
-        return false;
-
     if (m_mode == QueryingRules)
         return false;
+    if (m_mode == SharingRules)
+        return true;
 
-    PseudoId pseudoId = CSSSelector::pseudoId(selector.pseudoType());
-    if (pseudoId != NOPSEUDO && m_mode != SharingRules)
-        result.dynamicPseudo = pseudoId;
-
-    // ::before, ::after, etc.
+    result.dynamicPseudo = CSSSelector::pseudoId(selector.pseudoType());
+    ASSERT(result.dynamicPseudo != NOPSEUDO);
     return true;
 }
 
 bool SelectorChecker::checkPseudoHost(const SelectorCheckingContext& context, MatchResult& result) const
 {
     const CSSSelector& selector = *context.selector;
     Element& element = *context.element;
 
     if (m_mode == SharingRules)
         return true;
@@ skipping 135 matching lines @@
 }
 
 bool SelectorChecker::matchesFocusPseudoClass(const Element& element)
 {
     if (InspectorInstrumentation::forcePseudoState(const_cast<Element*>(&element), CSSSelector::PseudoFocus))
         return true;
     return element.focused() && isFrameFocused(element);
 }
 
 }