[Webkit-unassigned] [Bug 281976] New: Unexpected @scope match with `:has(:scope /*...*/)`

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=281976

            Bug ID: 281976
           Summary: Unexpected @scope match with `:has(:scope /*...*/)`
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dshin at mozilla.com
                CC: koivisto at iki.fi

Created attachment 473017

  --> https://bugs.webkit.org/attachment.cgi?id=473017&action=review

Minimum Reproducible Case

STR: Load the attached testcase on Safari Technology Preview Release 205 (Safari 18.0, WebKit 20621.1.2.111.4)
Expected behaviour: "What color?" is black
Actual behaviour: It's green

The inner scope's selector is `:has(:scope .baz)`, which implies that a potential inner scope must be an ancestor of `:scope`, which is incompatible with outer scope being the ancestor of the inner scope.

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