worklet-animation-play.https.html

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This test has a WPT meta file that expects 2 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /animation-worklet/worklet-animation-play.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Basic use of Worklet Animation</title>

<link rel="help" href="https://drafts.css-houdini.org/css-animationworklet/">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/web-animations/testcommon.js"></script>

<script src="common.js"></script>

<div id="target"></div>

<script>

  promise_test(async t => {

    await registerConstantLocalTimeAnimator(500);

    const effect = new KeyframeEffect(target, [{ opacity: 0 }], { duration: 1000 });

    const animation = new WorkletAnimation('constant_time', effect);

    animation.play();

    // wait until local times are synced back to the main thread.

    await waitForAnimationFrameWithCondition(_ => {

      return getComputedStyle(target).opacity != '1';

});

    assert_equals(getComputedStyle(target).opacity, "0.5");

    animation.cancel();

  }, "A running worklet animation should output values at specified local time.");

  promise_test(async t => {

    await registerConstantLocalTimeAnimator(500);

    const effect = new KeyframeEffect(target, [{ opacity: 0 }], { duration: 1000 });

    const animation = new WorkletAnimation('constant_time', effect);

    animation.play();

    await waitForAnimationFrameWithCondition(_=> {

        return animation.playState == "running"

});

    const prevCurrentTime = animation.currentTime;

    animation.play();

    assert_equals(animation.playState, "running");

    assert_equals(animation.currentTime, prevCurrentTime)

    animation.cancel();

  }, "Playing a running animation should be a no-op.");

</script>