Add support for selection: https://drafts.csswg.org/css-contain/#relevant-to-the-user Either the element or its contents are selected, as described in CSS Pseudo-Elements 4 § 3 Highlight Pseudo-elements.
Created attachment 466716 [details] Selection
Just keep the diff for now since bug 236711 needs to land first.
<rdar://problem/111207045>
Pull request: https://github.com/WebKit/WebKit/pull/15905
Committed 267474@main (e61b784a19ec): <https://commits.webkit.org/267474@main> Reviewed commits have been landed. Closing PR #15905 and removing active labels.