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<!DOCTYPE html>
<title>Tests that the anchor element can be in a different tree scope</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#target-anchor-element">
<link rel="author" href="mailto:xiaochengh@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
.cb {
position: absolute;
}
#host1::part(anchor) {
anchor-name: --a1;
margin-left: 15px;
}
#target1 {
position: absolute;
left: anchor(--a1 left);
}
</style>
<div class="cb">
<div id="host1"></div>
<div id="target1"></div>
</div>
<div class="cb">
<div id="host2"></div>
</div>
<script>
test(() => {
host1.attachShadow({mode: 'open'}).innerHTML = '<div part="anchor"></div>';
assert_equals(target1.offsetLeft, 15);
}, 'Should be able to set anchor-name to a shadow DOM part and anchor to it');
test(() => {
let shadow = host2.attachShadow({mode: 'open'});
shadow.innerHTML = `
<style>
:host {
anchor-name: --a2;
margin-left: 15px;
}
#target2 {
position: absolute;
left: anchor(--a2 left);
}
</style>
<div id="target2"></div>
`;
assert_equals(shadow.getElementById('target2').offsetLeft, 15);
}, 'Should be able to set anchor-name to the shadow host and anchor to it');
</script>
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