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[scroll-animation-1][interop-2026] Clarify when named timeline (re-) lookup is processed #13944

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@hiikezoe

This is related to scroll-timeline-in-container-query.html.

In short both Chrome and Firefox consider looking up named timeline as part of style resolution, but WebKit doesn't since WebKit/WebKit@e1f5a71 . (The test itself was re-written in the WebKit commit).

The spec doesn't specifically mention when timeline looking-up should be processed, so I think there's a spec gap, the spec should clarify it.

Thus I'd propose to change the test as tentative and exclude it from interop-2026, if this spec issue sounds reasonable.

@graouts @flackr @BorisChiou @dshin-moz

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