firefox-main/testing/web-platform/tests/css/css-view-transitions/scoped/auto-nesting.html

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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="match" href="auto-nesting-ref.html">
<!-- Anti-aliasing along borders of boxes -->
<meta name="fuzzy" content="maxDifference=0-150; totalPixels=0-2400">
<title>Auto-nesting</title>
<style>
.box {
height: 100px;
width: 100px;
view-transition-name: match-element;
color: white;
margin-bottom: 10px;
position: relative;
}
.c1 {
background-color: rebeccapurple;
}
.c2 {
background-color: hotpink;
}
.c3 {
background-color: mediumvioletred;
}
#a {
background-color: #eee;
border: 5px solid black;
position: absolute;
left: 0;
top: 0;
width: 250px;
height: 250px;
overflow: clip;
}
#b {
background-color: #eee;
border: 5px solid black;
position: absolute;
width: 250px;
height: 250px;
overflow: visible;
left: 300px;
top: 0;
}
::view-transition-group(*),
::view-transition-image-pair(*),
::view-transition-old(*),
::view-transition-new(*) {
/* freeze all animations at the end */
animation-duration: 100000s;
animation-timing-function: steps(1, jump-start);
}
</style>
<script src="/common/reftest-wait.js"></script>
</head>
<body>
<div id="a">
<div class="box c1"></div>
<div class="box c2"></div>
<div class="box c3"></div>
</div>
<div id="b">
<div class="box c1"></div>
<div class="box c2"></div>
<div class="box c3"></div>
</div>
</div>
</body>
<script>
function start_transition(scope) {
return scope.startViewTransition(() => {
const firstChild = scope.firstElementChild;
const lastChild = scope.lastElementChild;
scope.insertBefore(lastChild, firstChild);
});
}
window.onload = async () => {
let vt1 = start_transition(document.getElementById('a'));
let vt2 = start_transition(document.getElementById('b'));
await Promise.all([vt1.ready, vt2.ready]);
requestAnimationFrame(takeScreenshot);
}
</script>
</html>