| <!DOCTYPE html> |
| <html class=reftest-wait> |
| <title>View transitions: waitUntil allows animation manipulation</title> |
| <link rel="help" href="https://www.w3.org/TR/css-view-transitions-1/"> |
| <link rel="author" href="mailto:vmpstr@chromium.org"> |
| <link rel="match" href="view-transition-waituntil-animation-manipulation-ref.html"> |
| <script src="/common/reftest-wait.js"></script> |
| <style> |
| :root { view-transition-name: none } |
| |
| #target { |
| width: 100px; |
| height: 100px; |
| background: green; |
| view-transition-name: target; |
| } |
| |
| #target.after { |
| background: red; |
| } |
| |
| ::view-transition { background: lightpink; } |
| ::view-transition-group(*) { |
| animation-duration: 1ms; |
| } |
| </style> |
| |
| <div id=target></div> |
| |
| <script> |
| failIfNot(document.startViewTransition, "Missing document.startViewTransition"); |
| failIfNot(ViewTransition.prototype.waitUntil, "ViewTransition.waitUntil is not available"); |
| |
| async function runTest() { |
| const transition = document.startViewTransition(() => target.classList.add("after")); |
| transition.waitUntil(new Promise(() => {})); |
| |
| transition.ready.then(async () => { |
| // Let the animation run to the end. |
| const animations = document.getAnimations(); |
| animations.forEach(a => { |
| a.currentTime = 1; |
| }); |
| |
| // Wait a few frames. |
| await new Promise(requestAnimationFrame); |
| await new Promise(requestAnimationFrame); |
| await new Promise(requestAnimationFrame); |
| |
| // Now, rewind the animation and take a screenshot. |
| requestAnimationFrame(() => { |
| animations.forEach(a => { |
| a.play(); |
| a.pause(); |
| a.currentTime = 0; |
| }); |
| takeScreenshot(); |
| }); |
| }); |
| } |
| onload = () => requestAnimationFrame(() => requestAnimationFrame(runTest)); |
| </script> |
