| <!DOCTYPE html> |
| <html class=reftest-wait> |
| <title>View transitions: use snapshot containing block for absolute position</title> |
| <link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/"> |
| <link rel="author" href="mailto:bokan@chromium.org"> |
| <link rel="match" href="snapshot-containing-block-absolute-ref.html"> |
| <meta name="fuzzy" content="maxDifference=0-20; totalPixels=0-100"> |
| |
| <script src="/common/reftest-wait.js"></script> |
| <style> |
| :root { |
| view-transition-name: none; |
| background-color: red; |
| } |
| |
| body { |
| height: 400vh; |
| } |
| |
| #target { |
| position: absolute; |
| left: 0px; |
| top: 600px; |
| width: 100px; |
| height: 100px; |
| |
| display: flex; |
| justify-content: center; |
| flex-direction: column; |
| align-items: center; |
| |
| background: darkseagreen; |
| view-transition-name: target; |
| } |
| |
| ::view-transition-group(target) { |
| animation-duration: 50s; |
| animation-play-state: paused; |
| top: unset; |
| left: unset; |
| right: 0px; |
| bottom: 0px; |
| } |
| |
| ::view-transition { |
| position: absolute; |
| left: 20px; |
| top: 40px; |
| width: 700px; |
| height: 500px; |
| background-color: limegreen; |
| } |
| |
| ::view-transition-old(*) { |
| animation: unset; |
| opacity: 1; |
| } |
| |
| ::view-transition-new(*) { |
| animation: unset; |
| opacity: 0; |
| } |
| |
| </style> |
| |
| <div id="target">TARGET</div> |
| |
| <script> |
| failIfNot(document.startViewTransition, "Missing document.startViewTransition"); |
| |
| async function runTest() { |
| // Start the view transition at a scroll offset so that the snapshot |
| // containing block differs from the initial containing block. Scroll so that |
| // the target is at 0,0 so its transition group has an identity transform. |
| const scrollTargetY = document.getElementById('target').offsetTop; |
| window.scrollTo(0, scrollTargetY); |
| let transition = document.startViewTransition(); |
| await transition.ready; |
| takeScreenshot(); |
| } |
| |
| onload = () => requestAnimationFrame(() => requestAnimationFrame(runTest)); |
| </script> |
