The CSS Animations and CSS Values specifications forbid keyframes names to be CSS wide keywords, and "default", and "none".
<rdar://problem/101226253>
Pull request: https://github.com/WebKit/WebKit/pull/5432
Committed 255640@main (d71fb1b829e7): <https://commits.webkit.org/255640@main> Reviewed commits have been landed. Closing PR #5432 and removing active labels.