The test css/css-animations/KeyframeEffect-getKeyframes.tentative.html was changed recently in https://github.com/web-platform-tests/wpt/commit/1a5c61d2ca9d0f2c2801adf2b433c7931512152f to account for the `animation-composition` property. We need to update our implementation to pass this test, or indicate whether it is incorrect.
*** Bug 251498 has been marked as a duplicate of this bug. ***
So the relevant piece of information here is that getKeyframes() should return "replace" for the "composite" property for implicit keyframes of a CSS Animation, per step 2 of https://drafts.csswg.org/css-animations-2/#keyframes.
Pull request: https://github.com/WebKit/WebKit/pull/9453
Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/38297
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Committed 259739@main (52923169468b): <https://commits.webkit.org/259739@main> Reviewed commits have been landed. Closing PR #9453 and removing active labels.
<rdar://problem/104947614>