https://drafts.csswg.org/css-align-3/#baseline-export
<rdar://problem/117424263>
Pull request: https://github.com/WebKit/WebKit/pull/19501
Committed 269857@main (2688e1f33c19): <https://commits.webkit.org/269857@main> Reviewed commits have been landed. Closing PR #19501 and removing active labels.