| <!DOCTYPE html> |
| <meta name="timeout" content="long"> |
| <html> |
| <title>View transitions: CSS Animations are paused while render-blocked</title> |
| <link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/"> |
| <link rel="author" href="mailto:khushalsagar@chromium.org"> |
| |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| |
| <style> |
| @keyframes fade { |
| from { |
| opacity: 0; |
| } |
| } |
| |
| div { |
| width: 100px; |
| height: 100px; |
| background: blue; |
| contain: paint; |
| view-transition-name: target; |
| } |
| |
| .animated { |
| animation: fade 0.5s; |
| } |
| </style> |
| |
| <div id=target></div> |
| |
| <script> |
| let renderBlocked = true; |
| |
| promise_test(() => { |
| assert_implements(document.startViewTransition, "Missing document.startViewTransition"); |
| return new Promise(async (resolve, reject) => { |
| requestAnimationFrame(() => { |
| document.startViewTransition(() => { |
| return new Promise(async (inner_resolve) => { |
| step_timeout(() => { |
| renderBlocked = false; |
| inner_resolve(); |
| }, 1000); |
| }); |
| }); |
| |
| target.classList.toggle("animated"); |
| target.onanimationend = () => { |
| if (renderBlocked) |
| reject(); |
| else |
| resolve(); |
| }; |
| }); |
| }); |
| }, "CSS animation is blocked until prepare callback"); |
| </script> |
