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 ac22228587317fc2e55e75a39ecff29040f2c3b1..a04be665d7c945da7d47a2668ec6d21832165837 100644
--- a/Source/core/css/parser/CSSGrammar.y
+++ b/Source/core/css/parser/CSSGrammar.y
@@ -1343,7 +1343,8 @@ 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;
         }
@@ -1357,7 +1358,8 @@ 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;
         }