Make <attr-name> accept any CSS identifier

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/css/parser/CSSPropertyParser.h"
 
 #include "core/StylePropertyShorthand.h"
 #include "core/css/CSSBasicShapeValues.h"
 #include "core/css/CSSBorderImage.h"
 #include "core/css/CSSContentDistributionValue.h"
@@ skipping 2308 matching lines @@
         return consumeIdent(range);
     return consumeImage(range, context);
 }
 
 static CSSValue* consumeAttr(CSSParserTokenRange args, CSSParserContext context)
 {
     if (args.peek().type() != IdentToken)
         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())
         attrName = attrName.lower();
 
     CSSFunctionValue* attrValue = CSSFunctionValue::create(CSSValueAttr);
     attrValue->append(CSSCustomIdentValue::create(attrName));
     return attrValue;
 }
 
@@ skipping 2612 matching lines @@
     case CSSPropertyGridTemplate:
         return consumeGridTemplateShorthand(CSSPropertyGridTemplate, important);
     case CSSPropertyGrid:
         return consumeGridShorthand(important);
     default:
         return false;
     }
 }
 
 } // namespace blink