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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- TODO update link -->
<link rel="help" href="https://www.w3.org/TR/css-view-transitions-2/">
<title>Scoped view transition DOM callback ordering</title>
</head>
<style>
#target {
background-color: blue;
height: 100px;
width: 100px;
z-index: 1;
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
<body>
<div id="target">
<div id="child"></div>
</div>
</body>
<script>
promise_test(async () => {
await waitForNextFrame();
const target = document.getElementById('target');
const updates = [];
const vt1 = document.startViewTransition(() => {
target.style = 'background-color: rgb(255, 165, 0)';
updates.push('vt1');
});
const vt2 = child.startViewTransition(() => {
target.style = 'background-color: rgb(102, 51, 153)';
updates.push('vt2');
});
const vt3 = target.startViewTransition(() => {
target.style = 'background-color: rgb(0, 128, 128)';
updates.push('vt3');
});
await Promise.all([vt1.ready, vt2.ready, vt3.ready]);
assert_array_equals(updates, ['vt1', 'vt2', 'vt3']);
assert_equals(getComputedStyle(target).backgroundColor, 'rgb(0, 128, 128)');
}, 'View transition DOM callbacks triggered in creation order.');
</script>
</html>
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