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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<!-- TODO update link -->
<link rel="help" href="https://www.w3.org/TR/css-view-transitions-2/">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Contain and name discovery</title>
</head>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#outer {
view-transition-name: outer;
}
#inner {
view-transition-name: inner;
}
.containment {
contain: view-transition;
}
</style>
<body>
<div id="outer">
<div id="inner"></div>
</div>
</body>
<script>
function capturedNames() {
const regexp = /\((?<name>[^\)]+)/;
const names = document.getAnimations()
.map(a => a.effect.pseudoElement)
.map(name => name.match(regexp).groups.name);
return [...new Set(names)].sort();
}
promise_test(async t => {
const outer = document.getElementById('outer');
const inner = document.getElementById('inner');
let vt = document.startViewTransition(() => {});
await vt.ready;
assert_array_equals(
capturedNames(), ['inner', 'outer', 'root'],
'Retrieve all names in absence of contain style');
vt.skipTransition();
document.documentElement.classList.toggle('containment');
vt = document.startViewTransition(() => {});
await vt.ready;
assert_array_equals(
capturedNames(), ['inner', 'outer', 'root'],
'contain on the root element does not affect tag discovery');
vt.skipTransition();
outer.classList.toggle('containment');
vt = document.startViewTransition(() => {});
await vt.ready;
assert_array_equals(
capturedNames(), ['root'],
'contain on outer element blocks tag discovery in subtree');
vt.skipTransition();
vt = outer.startViewTransition(() => {});
await vt.ready;
assert_array_equals(
capturedNames(), ['inner', 'outer'],
'contain on the scoped element includes self');
vt.skipTransition();
vt = inner.startViewTransition(() => {});
await vt.ready;
assert_array_equals(
capturedNames(), ['inner'],
'contain on ancestor of the scoped element does not affect tag ' +
'discovery');
vt.skipTransition();
outer.classList.toggle('containment');
inner.classList.toggle('containment');
vt = document.startViewTransition(() => {});
await vt.ready;
assert_array_equals(
capturedNames(), ['outer', 'root'],
'contain on inner element still permits tag discovery of ancestor ' +
'elements');
vt.skipTransition();
vt = outer.startViewTransition(() => {});
await vt.ready;
assert_array_equals(
capturedNames(), ['outer'],
'contain on inner element limits tag discovery on outer element');
vt.skipTransition();
vt = inner.startViewTransition(() => {});
await vt.ready;
assert_array_equals(
capturedNames(), ['inner'],
'contain permits tag discovery on scoped element');
vt.skipTransition();
}, 'Contain: view-transition blocks propagation of name discovery.');
</script>
</html>
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