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

I think the other value of these selectors is that they are much faster than `:has()` (though they require the browser to do a little bit of extra up-front work to get that benefit).  I'm still quite concerned that `:has()` is going to create selector performance problems that will require things like lints to forbid `:has()` and developers to know to avoid it.

While in theory we could detect and optimize some very specific cases of `:has()` such as `:has(:target)`, that seems like it would create more confusion around what the performance characteristics of CSS selectors are.  There's value in creating a platform that is understandable to the developers that use it -- and this does apply to its performance characteristics.

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Received on Wednesday, 14 June 2023 00:38:30 UTC