| Index: Source/core/frame/UseCounter.h | 
| diff --git a/Source/core/frame/UseCounter.h b/Source/core/frame/UseCounter.h | 
| index a358ef32ec06f6ac61f04b022b29dd783efb6636..af82139b8851e478b6a38d1a9f8f763830ad3518 100644 | 
| --- a/Source/core/frame/UseCounter.h | 
| +++ b/Source/core/frame/UseCounter.h | 
| @@ -302,6 +302,7 @@ public: | 
| ContentSecurityPolicyReportOnlyInMeta, | 
| PrefixedMediaSourceOpen, | 
| ResetReferrerPolicy, | 
| +        CaseInsensitiveAttrSelectorMatch, // Case-insensitivity dropped from specification. | 
| // Add new features immediately above this line. Don't change assigned | 
| // numbers of any item, and don't reuse removed slots. | 
| NumberOfFeatures, // This enum value must be last. | 
|  |