While we fixed a WPT test that tested override of transform animation using !important in bug 252481, there is a case that that patch did not cover. The case is when the !important value matches the 0% value of the animation, as would be the case where no 0% keyframe is specified.
Pull request: https://github.com/WebKit/WebKit/pull/12115
Committed 262327@main (6dd6ecba860d): <https://commits.webkit.org/262327@main> Reviewed commits have been landed. Closing PR #12115 and removing active labels.
<rdar://problem/107418889>