If a tech is unsupported but a valid keyword, it should still be a parsed. The unsupported font tech should not be loaded though. See https://github.com/w3c/csswg-drafts/issues/8793
<rdar://problem/112135896>
Pull request: https://github.com/WebKit/WebKit/pull/15778
Committed 265999@main (8a43470a0beb): <https://commits.webkit.org/265999@main> Reviewed commits have been landed. Closing PR #15778 and removing active labels.