https://drafts.csswg.org/css-fonts-4/#font-format-values Only the specified identifiers are allowed. Others should be parse errors.
<rdar://problem/102018015>
Pull request: https://github.com/WebKit/WebKit/pull/6190
Committed 256382@main (9b942dffc4a2): <https://commits.webkit.org/256382@main> Reviewed commits have been landed. Closing PR #6190 and removing active labels.