worklet-animation-pause.https.html (2026B)
1 <!DOCTYPE html> 2 <title>Verify that currentTime and playState are correct when animation is paused</title> 3 <link rel="help" href="https://drafts.css-houdini.org/css-animationworklet/"> 4 5 <script src="/resources/testharness.js"></script> 6 <script src="/resources/testharnessreport.js"></script> 7 <script src="/web-animations/testcommon.js"></script> 8 <script src="common.js"></script> 9 10 <div id="box"></div> 11 12 <script> 13 14 setup(setupAndRegisterTests, {explicit_done: true}); 15 16 function createAnimation() { 17 const box = document.getElementById('box'); 18 const effect = new KeyframeEffect(box, 19 { transform: ['translateY(100px)', 'translateY(200px)'] }, 20 { duration: 100, iterations: 1 } 21 ); 22 23 return new WorkletAnimation('passthrough', effect); 24 } 25 26 async function setupAndRegisterTests() { 27 await registerPassthroughAnimator(); 28 29 promise_test(async t => { 30 const animation = createAnimation(); 31 animation.play(); 32 // Immediately pausing animation should freeze the current time at 0. 33 animation.pause(); 34 assert_equals(animation.currentTime, 0); 35 assert_equals(animation.playState, "paused"); 36 // Wait some time to ensure a paused animation actually freezes. 37 await waitForNextFrame(); 38 assert_equals(animation.currentTime, 0); 39 assert_equals(animation.playState, "paused"); 40 }, 'pausing an animation freezes its current time'); 41 42 promise_test(async t => { 43 const animation = createAnimation(); 44 animation.pause(); 45 animation.play(); 46 // Allow one async animation frame to pass so that animation is running. 47 await waitForAsyncAnimationFrames(1); 48 assert_equals(animation.playState, "running"); 49 // Allow time to advance so that we have a non-zero current time. 50 await waitForDocumentTimelineAdvance(); 51 const timelineTime = document.timeline.currentTime; 52 assert_greater_than(animation.currentTime, 0); 53 assert_times_equal(animation.currentTime, (timelineTime - animation.startTime)); 54 }, 'playing a paused animation should resume it'); 55 56 done(); 57 } 58 59 </script>