The `scroll-timeline` shorthand property must adhere to the rules of a coordinating list property group (see https://drafts.csswg.org/css-values-4/#linked-properties). The WPT test for sterilization of this property is incorrect (see https://github.com/web-platform-tests/wpt/issues/43336) so we must fix it and ensure our implementation is right.
Pull request: https://github.com/WebKit/WebKit/pull/20898
Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/43354
Committed 271190@main (d142435f83e6): <https://commits.webkit.org/271190@main> Reviewed commits have been landed. Closing PR #20898 and removing active labels.
<rdar://problem/118869212>