Re: [csswg-drafts] [css-selectors] `:has()` and performance (#3345)

From: Emilio Cobos Álvarez via GitHub <sysbot+gh@w3.org> Date: Mon, 26 Nov 2018 09:09:09 +0000 To: public-css-archive@w3.org Message-ID: <issue_comment.created-441566869-1543223348-sysbot+gh@w3.org> · This archive was generated by hypermail 2.4.0 : Tuesday, 5 July 2022 06:41:39 UTC

> would be essentially identical in terms of performance, and therefore viable for the live profile.

That is not true. `b.matches('a b:has(c)')` requires looking at every descendant of `b`, while `c.matches('a b c')` does not. Evaluating the selector is much more expensive.

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