List marker pseudo elements.

Source/core/css/parser/CSSSelectorParser.cpp

Index: Source/core/css/parser/CSSSelectorParser.cpp
diff --git a/Source/core/css/parser/CSSSelectorParser.cpp b/Source/core/css/parser/CSSSelectorParser.cpp
index 132684f979537e1079eb5b4e1c28ad34605add94..75d6fb21f078e3935bb0fef1d11c0f73cbcfbbfb 100644
--- a/Source/core/css/parser/CSSSelectorParser.cpp
+++ b/Source/core/css/parser/CSSSelectorParser.cpp
@@ -261,6 +261,13 @@ PassOwnPtr<CSSParserSelector> CSSSelectorParser::consumeAttribute(CSSParserToken
     return selector.release();
 }
 
+bool CSSSelectorParser::selectorIsAllowedInParsingMode(CSSSelector::PseudoType type) const
+{
+    if (isUASheetBehavior(m_context.mode()))
+        return true;
+    return type != CSSSelector::PseudoMarker;
+}
+
 PassOwnPtr<CSSParserSelector> CSSSelectorParser::consumePseudo(CSSParserTokenRange& range)
 {
     ASSERT(range.peek().type() == ColonToken);
@@ -282,8 +289,10 @@ PassOwnPtr<CSSParserSelector> CSSSelectorParser::consumePseudo(CSSParserTokenRan
 
     if (token.type() == IdentToken) {
         range.consume();
-        if (selector->pseudoType() == CSSSelector::PseudoUnknown)
+        if (selector->pseudoType() == CSSSelector::PseudoUnknown
+            || !selectorIsAllowedInParsingMode(selector->pseudoType())) {
             return nullptr;
+        }
         return selector.release();
     }