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<!DOCTYPE html>
<html class=reftest-wait>
<head>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-2/">
<link rel="match" href="nested-scope-ref.html">
<script src="/common/reftest-wait.js"></script>
<script src="/web-animations/testcommon.js"></script>
<style>
.box { position: relative; contain: strict; }
#scopeA { background: #ddd; view-transition-name: none;
left: 0; top: 0; width: 300px; height: 300px; }
#partA { background: #4af;
left: 30px; top: 30px; width: 240px; height: 240px; }
#scopeB { background: #eee; contain: view-transition;
left: 30px; top: 30px; width: 180px; height: 180px; }
#partB { background: cyan;
left: 30px; top: 30px; width: 120px; height: 120px; }
::view-transition-old(*) { animation: -ua-view-transition-fade-out 1s paused; }
::view-transition-new(*) { animation: -ua-view-transition-fade-in 1s paused; }
.tr { view-transition-name: demo; }
</style>
</head>
<body>
<div id=scopeA class=box>
<div id=partA class="box tr">
<div id=scopeB class=box>
<div id=partB class="box tr">
</div>
</div>
</div>
</div>
<script>
failIfNot(scopeA.startViewTransition, "Missing element.startViewTransition");
// This test runs simultaneous transitions on two scopes, one inside the other.
// It verifies that the inner and outer participants are both visible while both
// transitions are in progress. (This entails rendering the inner transition
// through the ::view-transition-new for the outer participant.)
async function runTest() {
await waitForCompositorReady();
await scopeB.startViewTransition().ready;
await scopeA.startViewTransition(() => {
scopeA.style.background = "#ccc";
}).ready;
requestAnimationFrame(takeScreenshot);
}
onload = () => runTest();
</script>
</body>
</html>
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