Re: [csswg-drafts] [selectors-4] :valid-within / :invalid-within pseudo-classes

The current implementation of `:focus-within` in Gecko is by setting an independent bit flag on element, and apparently we have limited available bit flags without bloating every element in every page, so that pattern is not really scalable in terms of performance...

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Received on Thursday, 18 October 2018 20:34:50 UTC