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scroll-animations/css/animation-timeline-deferred.html asserts unspecced behavior. #1276

@kevers-google

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@kevers-google

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Two of the subtests assert that an unresolved deferred timeline returns a timeline with a null source. This is not covered in the scroll-animations-1 spec. Rob Flack (flackr) has filed an issue to get this resolved:

w3c/csswg-drafts#13807 (comment)

The proposed resolution does not match either blink's implementation or webkit's. Firefox does not presently support scroll-animations.

The test for over-attachment appears to violate a more recent resolution in the spec where over-attachment resolves to the latest match in DOM order.

I propose that we rename to include .tentative until the proper handling for the web-exposed timeline is resolved, and drop from interop-2026.

Link to the test:
https://wpt.fyi/results/scroll-animations/css/animation-timeline-deferred.html?label=master&label=experimental&aligned&view=interop&q=label%3Ainterop-2026-scroll-driven-animations

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    test-change-proposalProposal to add or remove tests for an interop area

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