List marker pseudo elements.

Source/core/css/parser/CSSGrammar.y

 %{
 
 /*
  *  Copyright (C) 2002-2003 Lars Knoll (knoll@kde.org)
  *  Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  *  Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *  Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  *  Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
  *  This library is free software; you can redistribute it and/or
@@ skipping 1325 matching lines @@
 
 pseudo:
     ':' error_location IDENT {
         if ($3.isFunction())
             YYERROR;
         $$ = parser->createFloatingSelector();
         $$->setMatch(CSSSelector::PseudoClass);
         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;
         }
     }
     | ':' ':' error_location IDENT {
         if ($4.isFunction())
             YYERROR;
         $$ = parser->createFloatingSelector();
         $$->setMatch(CSSSelector::PseudoElement);
         parser->tokenToLowerCase($4);
         $$->setValue($4);
         // FIXME: This call is needed to force selector to compute the pseudoType early enough.
         CSSSelector::PseudoType type = $$->pseudoType();
-        if (type == CSSSelector::PseudoUnknown) {
+        if (type == CSSSelector::PseudoUnknown ||
+            !parser->isSelectorAllowedInParsingMode(type)) {

[Julien - ping for review, 2015/02/04 01:56:33]

Doh'!?

[dsinclair, 2015/02/04 04:41:32]

? Are you saying this is incorrect, or you don't like the way it's written with
a !?

             parser->reportError($3, InvalidSelectorPseudoCSSError);
             YYERROR;
         }
     }
     // used by ::cue(:past/:future)
     | ':' ':' CUEFUNCTION maybe_space simple_selector_list maybe_space closing_parenthesis {
         $$ = parser->createFloatingSelector();
         $$->setMatch(CSSSelector::PseudoElement);
         $$->adoptSelectorVector(*parser->sinkFloatingSelectorVector($5));
         $$->setValue($3);
@@ skipping 486 matching lines @@
     ;
 
 rule_error_recovery:
     /* empty */
   | rule_error_recovery error
   | rule_error_recovery invalid_square_brackets_block
   | rule_error_recovery invalid_parentheses_block
     ;
 
 %%