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The first step towards implementing CSS scroll driven animations.

Some of the imported tests continue to fail due to the fact that we serialize coordinating value list longhands (e.g. scroll-timeline-axis, animation-duration, etc) incorrectly in that if all values are the same we serialize them as a single value.

Gains us ~320 WPT tests.

The remaining failing tests in scroll-timeline-shorthand.html are due to
either:
 a) incorrect tests, see web-platform-tests/wpt#56181 or;
 b) a wider issue where we collapse coordinating value list longhand
properties to a single value when we shouldn't.
The remaining failing tests in view-timeline-shorthand.html are due to
either:
 a) incorrect tests, see web-platform-tests/wpt#56181 or;
 b) a wider issue where we collapse coordinating value list longhand
properties to a single value when we shouldn't.
Required for `animation-timeline` and the various `animation-trigger-*`
properties within the `animation` coordinating value list
@Calme1709 Calme1709 requested a review from AtkinsSJ as a code owner November 23, 2025 13:11
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