Re: [csswg-drafts] [css-animations-2][web-animations-2][scroll-animations-1] Timeline returned for scope with no timeline providing that name. (#13807)

This is an implementation consideration for [Gecko](https://bugzilla.mozilla.org/show_bug.cgi?id=2036423). In the attached [testcase](https://bugzilla.mozilla.org/attachment.cgi?id=9583338), on Blink and WebKit, toggling scroll timelines (Clicking the "Switch" button, causing the animation to have an inactive/unassociated timeline for a moment) causes the animation to continue in the playing state, but toggling in and out of `animation-timeline: none` (By clicking the "None" button twice) causes the animation to become paused.

Intuitively, I think the former behaviour makes more sense? Also, I see that toggling between `animation-timeline: auto` and `animation-timeline: none`, the animation does not pause.

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Received on Tuesday, 5 May 2026 19:35:58 UTC