See: https://drafts.csswg.org/css-values/#font-relative-lengths rcap & cap are covered separately in bug 242466
<rdar://problem/114367871>
Pull request: https://github.com/WebKit/WebKit/pull/17034
Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/41629
Committed 267321@main (424dee481509): <https://commits.webkit.org/267321@main> Reviewed commits have been landed. Closing PR #17034 and removing active labels.