Intent to Implement and Ship: Animation.updatePlaybackRate

[Kevin Ellis]

Contact emails kev...@chromium.org Explainer https://developer.mozilla.org/en-US/docs/Web/API/Animation/updatePlaybackRate Design docs/spec Specification: https://drafts.csswg.org/web-animations/#the-animation-interface https://drafts.csswg.org/web-animations/#the-animation-interface

https://drafts.csswg.org/web-animations/#seamlessly-updating-the-playback-rate-of-an-animation TAG review Summary Animation.updatePlaybackRate provides a means to seamlessly transition the playback rate of an animation such that there is no visible jump in the animation. Current time is preserved at the instance the new playback rate takes effect. Motivation Animation.updatePlaybackRate provides a means of ensure that a change in playback rate results in a smooth transition. Current time is preserved at the moment the new playback rate takes effect. This method is presently available on Firefox and under development for Safari. Adding support in Chrome ensure consistency across browsers. Risks

Interoperability and Compatibility Already shipped for Firefox and under development for Safari. Firefox: Shipped (https://wpt.fyi/results/web-animations/interfaces/Animation/idlharness.window.html?label=master) Edge: No public signals Safari: In development (https://wpt.fyi/results/web-animations/interfaces/Animation/idlharness.window.html?label=master) Web developers: No signals

Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)? Yes Is this feature fully tested by web-platform-tests? Yes Covered by interface and timing-model tests for web-animations. Adding support for Animation.updatePlaybackRate resolves 27 WPT failures. Tracking bug https://bugs.chromium.org/p/chromium/issues/detail?id=827634 Demo links https://wpt.fyi/results/web-animations/interfaces/Animation/idlharness.window.html?label=master https://wpt.fyi/results/web-animations/timing-model/animations/seamlessly-updating-the-playback-rate-of-an-animation.html?label=master Link to entry on the Chrome Platform Status https://www.chromestatus.com/features/6276633918963712

[Philip Jägenstedt]

LGTM1, this seems very useful, and it's cool to see Firefox already passing the tests that we'll now match. After implementing this, it might be a good idea to check if any of the newly passing tests fail in Firefox and look into why that might be. Sometimes that reveals stuff worth fixing before shipping.

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[Kevin Ellis]

Hi Philip,

Sounds good. Thus far, none of the test cases have been modified in order to address test failures.  Certainly, if any tests are introduced or modified, I'd be happy to compare with test results on Firefox.

[Daniel Bratell]

LGTM2

A little bit of a pity that there is now two ways to do basically the same thing, though not exactly the same thing.

/Daniel

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[Yoav Weiss]

LGTM3

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