List marker pseudo elements.

Source/core/css/parser/CSSGrammar.y

Index: Source/core/css/parser/CSSGrammar.y
diff --git a/Source/core/css/parser/CSSGrammar.y b/Source/core/css/parser/CSSGrammar.y
index b968c717c242d3a803fc64c17103380b27320063..82a920e42e40360547cab4c48713f4f37da626a3 100644
--- a/Source/core/css/parser/CSSGrammar.y
+++ b/Source/core/css/parser/CSSGrammar.y
@@ -1342,7 +1342,8 @@ pseudo:
         parser->tokenToLowerCase($3);
         $$->setValue($3);
         CSSSelector::PseudoType type = $$->pseudoType();
-        if (type == CSSSelector::PseudoUnknown) {
+        if (type == CSSSelector::PseudoUnknown ||
+            !parser->isSelectorAllowedInParsingMode(type)) {
             parser->reportError($2, InvalidSelectorPseudoCSSError);
             YYERROR;
         }
@@ -1356,7 +1357,8 @@ pseudo:
         $$->setValue($4);
         // FIXME: This call is needed to force selector to compute the pseudoType early enough.
         CSSSelector::PseudoType type = $$->pseudoType();
-        if (type == CSSSelector::PseudoUnknown) {
+        if (type == CSSSelector::PseudoUnknown ||
+            !parser->isSelectorAllowedInParsingMode(type)) {
             parser->reportError($3, InvalidSelectorPseudoCSSError);
             YYERROR;
         }