Intent to Implement and Ship: Animation.pending

[Kevin Ellis]

Contact emails kev...@chromium.org Explainer https://developer.mozilla.org/en-US/docs/Web/API/Animation/pending Design docs/spec Specification: https://drafts.csswg.org/web-animations/#the-animation-interface https://chromium-review.googlesource.com/c/chromium/src/+/1588283 TAG review Summary Add the pending attribute to the web animations API in compliance with the web animation spec (https://drafts.csswg.org/web-animations/#the-animation-interface). A pending animation is waiting on an asynchronous operation that affects the play state. Adding support for this attribute does not affect the rendering or timing of animations, but simply exposes the signal. The attribute is used in testing and adding support fixes 30 WPT test failures. Motivation Adding the Animation.pending attribute fixes 30 WPT test failures for web animations. Risks

Interoperability and Compatibility Animation.pending has already shipped with Firefox and is under development in Safari. Firefox: Shipped (https://wpt.fyi/results/web-animations/interfaces/Animation/pending.html) Edge: No public signals Safari: In development (https://wpt.fyi/results/web-animations/interfaces/Animation/pending.html) 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 Animation.pending is covered by WPT tests in: * web-animations/interfaces/Animation * web-animations/timing-model/animations Lack of support for Animation.pending is a significant source of web animation tests failures (tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=772407). Tracking bug https://bugs.chromium.org/p/chromium/issues/detail?id=827630 Demo links https://wpt.fyi/results/web-animations/interfaces/Animation https://wpt.fyi/results/web-animations/timing-model/animations Link to entry on the Chrome Platform Status https://www.chromestatus.com/features/4843845109940224

[Chris Harrelson]

LGTM1

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[Daniel Bratell]

LGTM2

/Daniel

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/* Opera Software, Linköping, Sweden: CET (UTC+1) */

[Yoav Weiss]

LGTM3

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