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<!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;
top: unset;
left: unset;
right: 0px;
bottom: 0px;
}
::view-transition {
position: absolute;
left: 20px;
top: 40px;
width: 700px;
height: 500px;
background-color: limegreen;
}
</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>
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