Make <attr-name> accept any CSS identifier

third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp

Index: third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp b/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
index f22d087d3a5e2aa4b325bde047ed67d1d604a5d7..7e2f1dfc3846391f51c857ec9007cddb6f844390 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
@@ -2326,11 +2326,7 @@ static CSSValue* consumeAttr(CSSParserTokenRange args, CSSParserContext context)
         return nullptr;
 
     String attrName = args.consumeIncludingWhitespace().value();
-    // CSS allows identifiers with "-" at the start, like "-webkit-mask-image".
-    // But HTML attribute names can't have those characters, and we should not
-    // even parse them inside attr().
-    // TODO(timloh): We should allow any <ident-token> here.
-    if (attrName[0] == '-' || !args.atEnd())
+    if (!args.atEnd())
         return nullptr;
 
     if (context.isHTMLDocument())