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<!DOCTYPE html>
<title>anchor-name is a tree scoped reference</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#target-anchor-element">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body { margin-top: 0; }
#anchor {
anchor-name: --anchor;
}
#filler {
height: 100px;
}
#anchored {
position: absolute;
top: anchor(--anchor top);
}
</style>
<div id="host"></div>
<div id="filler"></div>
<div id="anchor"></div>
<div id="anchored"></div>
<script>
const host_root = host.attachShadow({mode:"open"});
host_root.innerHTML = `
<style>
div { anchor-name: --anchor; }
</style>
<div></div>
`;
test(() => {
assert_equals(anchored.offsetTop, 100, "#anchored is positioned against #anchor");
}, "anchor-name should not leak out of a shadow tree");
</script>
<div id="anchor_host" style="anchor-name: --anchor-host"></div>
<script>
const anchor_host_root = anchor_host.attachShadow({mode:"open"});
anchor_host_root.innerHTML = `
<style>
div {
position: absolute;
left: anchor(--anchor-host left, 37px);
}
</style>
<div id="anchored"></div>
`;
test(() => {
assert_equals(anchor_host_root.querySelector("#anchored").offsetLeft, 37, "#anchored is positioned using fallback");
}, "anchor() in shadow tree should not match host anchor-name");
</script>
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