Reject duplicate keywords for 'text-decoration'. (Bug 470704) r+sr=bzbarsky

layout/style/nsCSSParser.cpp

@@ -7627,7 +7627,12 @@ CSSParserImpl::ParseTextDecoration(nsCSSValue& aValue)
       PRInt32 index;
       for (index = 0; index < 3; index++) {
         if (ParseEnum(keyword, nsCSSProps::kTextDecorationKTable)) {
-          intValue |= keyword.GetIntValue();
+          PRInt32 newValue = keyword.GetIntValue();
+          if (newValue & intValue) {
+            // duplicate keyword is not allowed
+            return PR_FALSE;
+          }
+          intValue |= newValue;
         }
         else {
           break;

layout/style/test/test_property_syntax_errors.html

@@ -26,7 +26,6 @@ var gKnownFails = {
   "richness": [ " -0.01", "100.2", "108", "-3" ],
   "stress": [ " -0.01", "100.2", "108", "-3" ],
   "volume": [ " -0.01", "100.2", "108", "-3" ],
-  "text-decoration": [ "line-through blink line-through" ],
   "stroke-miterlimit": [ "0.9", "0" ]
 }