Re: [csswg-drafts] [selectors] Drop `:target-within`, deprecate `:focus-within` (#8357)

I believe the performance of `:has()` is significant in some cases, although that belief is based on conversations with implementers rather than measurement.  In particular, I see occasional suggestions for things like implementing a dark theme checkbox using `:root:has(#dark-theme-control:checked) ...` selectors, and my understanding is that a significant number of `:root:has(...)` selectors on a large page would add up to a measurable performance problem.

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Received on Wednesday, 14 June 2023 13:24:49 UTC