https://www.w3.org/TR/css-highlight-api-1/#intro
<rdar://problem/112208193>
Pull request: https://github.com/WebKit/WebKit/pull/15885
Committed 266106@main (940410f9ac37): <https://commits.webkit.org/266106@main> Reviewed commits have been landed. Closing PR #15885 and removing active labels.