https://www.w3.org/TR/css-highlight-api-1/#intro
<rdar://problem/113300782>
Pull request: https://github.com/WebKit/WebKit/pull/16340
Committed 266552@main (cf2caed3a2f9): <https://commits.webkit.org/266552@main> Reviewed commits have been landed. Closing PR #16340 and removing active labels.