[Webkit-unassigned] [Bug 234842] New: [:has() pseudo-class] Stop doing accurate style invalidation for repeated DOM mutations if it becomes expensive

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=234842

            Bug ID: 234842
           Summary: [:has() pseudo-class] Stop doing accurate style
                    invalidation for repeated DOM mutations if it becomes
                    expensive
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: koivisto at iki.fi

Even without :has() it is possible to have cases where the cost of doing accurate style invalidation exceeds the benefits. With :has() these cases become easier to hit. Add a backdown mechanism where we detect this and switch to eager invalidation.

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