Do not parse caption-side: left / right as valid CSS.

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

 // Copyright 2014 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/CSSParserFastPaths.h"
 
 #include "core/StylePropertyShorthand.h"
 #include "core/css/CSSColorValue.h"
 #include "core/css/CSSFunctionValue.h"
 #include "core/css/CSSIdentifierValue.h"
@@ skipping 518 matching lines @@
     case CSSPropertyWebkitBorderEndStyle:
     case CSSPropertyWebkitBorderStartStyle:
     case CSSPropertyColumnRuleStyle:
       return value_id >= CSSValueNone && value_id <= CSSValueDouble;
     case CSSPropertyBoxSizing:
       return value_id == CSSValueBorderBox || value_id == CSSValueContentBox;
     case CSSPropertyBufferedRendering:
       return value_id == CSSValueAuto || value_id == CSSValueDynamic ||
              value_id == CSSValueStatic;
     case CSSPropertyCaptionSide:
-      return value_id == CSSValueLeft || value_id == CSSValueRight ||
-             value_id == CSSValueTop || value_id == CSSValueBottom;
+      return value_id == CSSValueTop || value_id == CSSValueBottom;
     case CSSPropertyClear:
       return value_id == CSSValueNone || value_id == CSSValueLeft ||
              value_id == CSSValueRight || value_id == CSSValueBoth;
     case CSSPropertyClipRule:
     case CSSPropertyFillRule:
       return value_id == CSSValueNonzero || value_id == CSSValueEvenodd;
     case CSSPropertyColorInterpolation:
     case CSSPropertyColorInterpolationFilters:
       return value_id == CSSValueAuto || value_id == CSSValueSRGB ||
              value_id == CSSValueLinearRGB;
@@ skipping 673 matching lines @@
   if (IsColorPropertyID(property_id))
     return ParseColor(string, parser_mode);
   if (CSSValue* keyword = ParseKeywordValue(property_id, string, parser_mode))
     return keyword;
   if (CSSValue* transform = ParseSimpleTransform(property_id, string))
     return transform;
   return nullptr;
 }
 
 }  // namespace blink