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+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>The current time of a 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="box"></div>
+
+<script>
+'use strict';
+
+function CreateAnimation() {
+ const box = document.getElementById('box');
+ const effect = new KeyframeEffect(
+ box,
+ { height: ['100px', '50px'] },
+ 10000);
+
+ return new WorkletAnimation('passthrough', effect);
+}
+
+setup(setupAndRegisterTests, {explicit_done: true});
+
+function setupAndRegisterTests() {
+ registerPassthroughAnimator().then(() => {
+ promise_test(async t => {
+ const animation = CreateAnimation();
+ animation.play();
+
+ assert_equals(animation.currentTime, 0,
+ 'Current time returns the hold time set when entering the play-pending' +
+ 'state');
+
+ animation.cancel();
+ }, 'The current time returns the hold time when set');
+
+ promise_test(async t => {
+ const animation = CreateAnimation();
+ animation.play();
+
+ // Allow one async animation frame to pass so that animation is running.
+ await waitForAsyncAnimationFrames(1);
+ assert_equals(animation.playState, "running");
+ // Allow time to advance so that we have a non-zero current time.
+ await waitForDocumentTimelineAdvance();
+ const timelineTime = document.timeline.currentTime;
+ assert_greater_than(animation.currentTime, 0);
+ assert_times_equal(animation.currentTime, (timelineTime - animation.startTime));
+
+ animation.cancel();
+ }, 'The current time is calculated from the timeline time and start time');
+
+ done();
+ });
+}
+
+// TODO(majidvp): Add tests for playbackRate and animations that are not
+// associated with a timeline once these are supported in WorkletAnimation.
+// http://crbug.com/833846
+</script>