| Index: Source/core/css/parser/CSSParserFastPaths.cpp
 | 
| diff --git a/Source/core/css/parser/CSSParserFastPaths.cpp b/Source/core/css/parser/CSSParserFastPaths.cpp
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| index 3df7358db1f7fa4484dacbe144abdd0e54ca8b67..0c871017e0a5867bd3d6fc3f69f07c5fd9877414 100644
 | 
| --- a/Source/core/css/parser/CSSParserFastPaths.cpp
 | 
| +++ b/Source/core/css/parser/CSSParserFastPaths.cpp
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| @@ -50,6 +50,8 @@ static inline bool isSimpleLengthPropertyID(CSSPropertyID propertyId, bool& acce
 | 
|      case CSSPropertyWebkitMarginBefore:
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|      case CSSPropertyWebkitMarginEnd:
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|      case CSSPropertyWebkitMarginStart:
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| +    case CSSPropertyX:
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| +    case CSSPropertyY:
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|          acceptsNegativeNumbers = true;
 | 
|          return true;
 | 
|      default:
 | 
| 
 |