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+<!DOCTYPE html>
+<title>Verify that currentTime and playState are correct when animation is paused</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>
+
+setup(setupAndRegisterTests, {explicit_done: true});
+
+function createAnimation() {
+ const box = document.getElementById('box');
+ const effect = new KeyframeEffect(box,
+ { transform: ['translateY(100px)', 'translateY(200px)'] },
+ { duration: 100, iterations: 1 }
+ );
+
+ return new WorkletAnimation('passthrough', effect);
+}
+
+async function setupAndRegisterTests() {
+ await registerPassthroughAnimator();
+
+ promise_test(async t => {
+ const animation = createAnimation();
+ animation.play();
+ // Immediately pausing animation should freeze the current time at 0.
+ animation.pause();
+ assert_equals(animation.currentTime, 0);
+ assert_equals(animation.playState, "paused");
+ // Wait some time to ensure a paused animation actually freezes.
+ await waitForNextFrame();
+ assert_equals(animation.currentTime, 0);
+ assert_equals(animation.playState, "paused");
+ }, 'pausing an animation freezes its current time');
+
+ promise_test(async t => {
+ const animation = createAnimation();
+ animation.pause();
+ 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));
+ }, 'playing a paused animation should resume it');
+
+ done();
+}
+
+</script>
+