::before/::after are not features for invalidation.

third_party/WebKit/Source/core/css/RuleFeature.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 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 262 matching lines @@
     return ensureInvalidationSet(m_idInvalidationSets, id, type);
 }
 
 ALWAYS_INLINE InvalidationSet& RuleFeatureSet::ensurePseudoInvalidationSet(CSSSelector::PseudoType pseudoType, InvalidationType type)
 {
     return ensureInvalidationSet(m_pseudoInvalidationSets, pseudoType, type);
 }
 
 bool RuleFeatureSet::extractInvalidationSetFeature(const CSSSelector& selector, InvalidationSetFeatures& features)
 {
-    if (selector.match() == CSSSelector::Tag && selector.tagQName().localName() != starAtom)
+    if (selector.match() == CSSSelector::Tag && selector.tagQName().localName() != starAtom) {
         features.tagName = selector.tagQName().localName();
-    else if (selector.match() == CSSSelector::Id)
+        return true;
+    }
+    if (selector.match() == CSSSelector::Id) {
         features.id = selector.value();
-    else if (selector.match() == CSSSelector::Class)
+        return true;
+    }
+    if (selector.match() == CSSSelector::Class) {
         features.classes.append(selector.value());
-    else if (selector.isAttributeSelector())
+        return true;
+    }
+    if (selector.isAttributeSelector()) {
         features.attributes.append(selector.attribute().localName());
-    else if (selector.pseudoType() == CSSSelector::PseudoWebKitCustomElement)
+        return true;
+    }
+    if (selector.pseudoType() == CSSSelector::PseudoWebKitCustomElement) {
         features.customPseudoElement = true;
-    else if (selector.pseudoType() == CSSSelector::PseudoBefore || selector.pseudoType() == CSSSelector::PseudoAfter)
+        return true;
+    }
+    if (selector.pseudoType() == CSSSelector::PseudoBefore || selector.pseudoType() == CSSSelector::PseudoAfter)
         features.hasBeforeOrAfter = true;
-    else
-        return false;
-    return true;
+    return false;
 }
 
 InvalidationSet* RuleFeatureSet::invalidationSetForSelector(const CSSSelector& selector, InvalidationType type)
 {
     if (selector.match() == CSSSelector::Class)
         return &ensureClassInvalidationSet(selector.value(), type);
     if (selector.isAttributeSelector())
         return &ensureAttributeInvalidationSet(selector.attribute().localName(), type);
     if (selector.match() == CSSSelector::Id)
         return &ensureIdInvalidationSet(selector.value(), type);
@@ skipping 414 matching lines @@
 
 DEFINE_TRACE(RuleFeatureSet)
 {
 #if ENABLE(OILPAN)
     visitor->trace(siblingRules);
     visitor->trace(uncommonAttributeRules);
 #endif
 }
 
 } // namespace blink