it should be similar to what we already have for `cubic-bezier()`/`spring()`/`steps()`
Pull request: https://github.com/WebKit/WebKit/pull/17273
<rdar://problem/115095425>
Committed 270855@main (a933f8f85028): <https://commits.webkit.org/270855@main> Reviewed commits have been landed. Closing PR #17273 and removing active labels.