https://www.w3.org/TR/css-highlight-api-1/#intro
<rdar://problem/113361192>
Pull request: https://github.com/WebKit/WebKit/pull/16399
Committed 266614@main (21b682820f4a): <https://commits.webkit.org/266614@main> Reviewed commits have been landed. Closing PR #16399 and removing active labels.