Web-Facing Change PSA: No Auto-Rewind for AnimationTrigger Play Methods

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David A

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Jun 15, 2026, 11:52:40 AM (22 hours ago) Jun 15

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Contact emails

awogb...@chromium.org

Specification

https://drafts.csswg.org/animation-triggers-1/#valdef-animation-action-play

Summary

AnimationTrigger Play Methods will not auto-rewind, i.e. will not restart a finished animation. "play", "play-forwards" and "play-backwards" are values that, when specified in the association between an AnimationTrigger and an Animation, instruct the trigger to play the animation. This Chromestatus feature covers a specific aspect of the behavior of these keywords: when the relevant animation has already run to completion and these actions (play, play-forwards, play-backwards) are invoked, they will not cause the animation to restart, i.e. the animation will not "auto-rewind."

Blink component

Blink>Animation

Web Feature ID

Missing feature

Risks

Interoperability and Compatibility

Only chromium ships the AnimationTrigger feature presently. The change in behavior was agreed to by the CSS working group: https://github.com/w3c/csswg-drafts/issues/13643#issuecomment-4613983278

Gecko: No signal

WebKit: No signal

Web developers: No signals

Other signals:

WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications?

No information provided

Debuggability

No information provided

Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?

Yes

Is this feature fully tested by web-platform-tests?

Yes
https://wpt.fyi/results/scroll-animations/animation-trigger/animation-trigger-play-forwards-backwards.tentative.html?label=experimental&label=master&aligned

Tracking bug

https://crbug.com/519573765

Estimated milestones