third_party/blink/web_tests/external/wpt/animation-worklet/inactive-timeline.https.html - chromium/src - Git at Google

 <!DOCTYPE html>
 <meta charset=utf-8>
 <title>Correctness of worklet animation state when timeline becomes newly
          active or inactive.</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>
 <style>
   .scroller {
     overflow: auto;
     height: 100px;
     width: 100px;
   }
   .contents {
     height: 1000px;
     width: 100%;
   }
 </style>
 <body>
 <div id="log"></div>
 <script>
 'use strict';

 function createScroller(test) {
   var scroller = createDiv(test);
   scroller.innerHTML = "<div class='contents'></div>";
   scroller.classList.add('scroller');
   return scroller;
 }

 function createScrollLinkedWorkletAnimation(test) {
   const timeline = new ScrollTimeline({
     scrollSource: createScroller(test),
     timeRange: 1000
   });
   const DURATION = 1000; // ms
   const KEYFRAMES = { transform: ['translateY(100px)', 'translateY(200px)'] };
   return new WorkletAnimation('passthrough', new KeyframeEffect(createDiv(test),
         KEYFRAMES, DURATION), timeline);
 }

 setup(setupAndRegisterTests, {explicit_done: true});

 function setupAndRegisterTests() {
   registerPassthroughAnimator().then(() => {

     promise_test(async t => {
       const animation = createScrollLinkedWorkletAnimation(t);
       const scroller = animation.timeline.scrollSource;
       const target = animation.effect.target;

       // There is no direct way to control when local times of composited
       // animations are synced to the main thread. This test uses another
       // composited worklet animation with an always active timeline as an
       // indicator of when the sync is ready. The sync is done when animation
       // effect's output has changed as a result of advancing the timeline.
       const animationRef = createScrollLinkedWorkletAnimation(t);
       const scrollerRef = animationRef.timeline.scrollSource;
       const targetRef = animationRef.effect.target;

       const maxScroll = scroller.scrollHeight - scroller.clientHeight;
       const timeRange = animation.timeline.timeRange;
       scroller.scrollTop = 0.2 * maxScroll;

       // Make the timeline inactive.
       scroller.style.display = "none"
       // Force relayout.
       scroller.scrollTop;

       animation.play();
       animationRef.play();
       assert_equals(animation.currentTime, null,
         'Initial current time must be unresolved in idle state.');
       assert_equals(animation.startTime, null,
         'Initial start time must be unresolved in idle state.');
       waitForAnimationFrameWithCondition(_=> {
         return animation.playState == "running"
       });
       assert_equals(animation.currentTime, null,
         'Initial current time must be unresolved in playing state.');
       assert_equals(animation.startTime, null,
         'Initial start time must be unresolved in playing state.');

       scrollerRef.scrollTop = 0.2 * maxScroll;

       // Wait until local times are synced back to the main thread.
       await waitForAnimationFrameWithCondition(_ => {
         return animationRef.effect.getComputedTiming().localTime == 200;
       });

       assert_equals(animation.effect.getComputedTiming().localTime, null,
         'The underlying effect local time must be undefined while the ' +
         'timeline is inactive.');

       // Make the timeline active.
       scroller.style.display = ""
       scroller.scrollTop;

       assert_times_equal(animation.currentTime, 200,
         'Current time must be initialized.');
       assert_times_equal(animation.startTime, 0,
         'Start time must be initialized.');

       scrollerRef.scrollTop = 0.4 * maxScroll;
       // Wait until local times are synced back to the main thread.
       await waitForAnimationFrameWithCondition(_ => {
         return animationRef.effect.getComputedTiming().localTime == 400;
       });
       assert_times_equal(animation.effect.getComputedTiming().localTime, 200,
         'When the timeline becomes newly active, the underlying effect\'s ' +
         'timing should be properly updated.');

       // Make the timeline inactive again.
       scroller.style.display = "none"
       scroller.scrollTop;

       assert_times_equal(animation.currentTime, 200,
         'Current time must be the previous current time.');
       assert_equals(animation.startTime, null,
         'Initial start time must be unresolved.');

       scrollerRef.scrollTop = 0.6 * maxScroll;
       scrollerRef.scrollTop;
       // Wait until local times are synced back to the main thread.
       await waitForAnimationFrameWithCondition(_ => {
         return animationRef.effect.getComputedTiming().localTime == 600;
       });

       assert_times_equal(animation.effect.getComputedTiming().localTime, 200,
         'When the timeline becomes newly inactive, the underlying effect\'s ' +
         'timing should stay unchanged.');
     }, 'When timeline time becomes inactive previous current time must be ' +
        'the current time and start time unresolved');
     done();
   });
 }
 </script>
 </body>
	<!DOCTYPE html>
	<meta charset=utf-8>
	<title>Correctness of worklet animation state when timeline becomes newly
	active or inactive.</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>
	<style>
	.scroller {
	overflow: auto;
	height: 100px;
	width: 100px;
	}
	.contents {
	height: 1000px;
	width: 100%;
	}
	</style>
	<body>
	<div id="log"></div>
	<script>
	'use strict';

	function createScroller(test) {
	var scroller = createDiv(test);
	scroller.innerHTML = "<div class='contents'></div>";
	scroller.classList.add('scroller');
	return scroller;
	}

	function createScrollLinkedWorkletAnimation(test) {
	const timeline = new ScrollTimeline({
	scrollSource: createScroller(test),
	timeRange: 1000
	});
	const DURATION = 1000; // ms
	const KEYFRAMES = { transform: ['translateY(100px)', 'translateY(200px)'] };
	return new WorkletAnimation('passthrough', new KeyframeEffect(createDiv(test),
	KEYFRAMES, DURATION), timeline);
	}

	setup(setupAndRegisterTests, {explicit_done: true});

	function setupAndRegisterTests() {
	registerPassthroughAnimator().then(() => {

	promise_test(async t => {
	const animation = createScrollLinkedWorkletAnimation(t);
	const scroller = animation.timeline.scrollSource;
	const target = animation.effect.target;

	// There is no direct way to control when local times of composited
	// animations are synced to the main thread. This test uses another
	// composited worklet animation with an always active timeline as an
	// indicator of when the sync is ready. The sync is done when animation
	// effect's output has changed as a result of advancing the timeline.
	const animationRef = createScrollLinkedWorkletAnimation(t);
	const scrollerRef = animationRef.timeline.scrollSource;
	const targetRef = animationRef.effect.target;

	const maxScroll = scroller.scrollHeight - scroller.clientHeight;
	const timeRange = animation.timeline.timeRange;
	scroller.scrollTop = 0.2 * maxScroll;

	// Make the timeline inactive.
	scroller.style.display = "none"
	// Force relayout.
	scroller.scrollTop;

	animation.play();
	animationRef.play();
	assert_equals(animation.currentTime, null,
	'Initial current time must be unresolved in idle state.');
	assert_equals(animation.startTime, null,
	'Initial start time must be unresolved in idle state.');
	waitForAnimationFrameWithCondition(_=> {
	return animation.playState == "running"
	});
	assert_equals(animation.currentTime, null,
	'Initial current time must be unresolved in playing state.');
	assert_equals(animation.startTime, null,
	'Initial start time must be unresolved in playing state.');

	scrollerRef.scrollTop = 0.2 * maxScroll;

	// Wait until local times are synced back to the main thread.
	await waitForAnimationFrameWithCondition(_ => {
	return animationRef.effect.getComputedTiming().localTime == 200;
	});

	assert_equals(animation.effect.getComputedTiming().localTime, null,
	'The underlying effect local time must be undefined while the ' +
	'timeline is inactive.');

	// Make the timeline active.
	scroller.style.display = ""
	scroller.scrollTop;

	assert_times_equal(animation.currentTime, 200,
	'Current time must be initialized.');
	assert_times_equal(animation.startTime, 0,
	'Start time must be initialized.');

	scrollerRef.scrollTop = 0.4 * maxScroll;
	// Wait until local times are synced back to the main thread.
	await waitForAnimationFrameWithCondition(_ => {
	return animationRef.effect.getComputedTiming().localTime == 400;
	});
	assert_times_equal(animation.effect.getComputedTiming().localTime, 200,
	'When the timeline becomes newly active, the underlying effect\'s ' +
	'timing should be properly updated.');

	// Make the timeline inactive again.
	scroller.style.display = "none"
	scroller.scrollTop;

	assert_times_equal(animation.currentTime, 200,
	'Current time must be the previous current time.');
	assert_equals(animation.startTime, null,
	'Initial start time must be unresolved.');

	scrollerRef.scrollTop = 0.6 * maxScroll;
	scrollerRef.scrollTop;
	// Wait until local times are synced back to the main thread.
	await waitForAnimationFrameWithCondition(_ => {
	return animationRef.effect.getComputedTiming().localTime == 600;
	});

	assert_times_equal(animation.effect.getComputedTiming().localTime, 200,
	'When the timeline becomes newly inactive, the underlying effect\'s ' +
	'timing should stay unchanged.');
	}, 'When timeline time becomes inactive previous current time must be ' +
	'the current time and start time unresolved');
	done();
	});
	}
	</script>
	</body>