We landed a fair few changes recently to recompute keyframes when style changes while animations are active. The ever-increasing list of parameters added to StyleResolver::keyframeStylesForAnimation() as well as the ever-growing list of change checks made in KeyframeEffectStack::applyKeyframeEffects() should be encapsulated better.
Pull request: https://github.com/WebKit/WebKit/pull/9591
Committed 259838@main (7a34ce6d9914): <https://commits.webkit.org/259838@main> Reviewed commits have been landed. Closing PR #9591 and removing active labels.
<rdar://problem/105019146>