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<!DOCTYPE html>
<title>Tests that anchor names are correctly tree-scoped even with style sheet sharing</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>
body {
margin: 0;
}
.host {
width: 100px;
height: 100px;
}
#host2 {
margin-left: 200px;
}
</style>
<div class="host" id="host1"></div>
<div class="host" id="host2"></div>
<script>
document.querySelectorAll('.host').forEach(host => {
let shadow = host.attachShadow({mode: 'open'});
shadow.innerHTML = `
<style>
div { width: 100px; height: 100px; }
#anchor { anchor-name: --a; background: orange; }
#target {
position: fixed;
background: lime;
left: anchor(--a left);
top: anchor(--a bottom);
}
</style>
<div id=anchor>anchor</div>
<div id=target>target</div>
`;
});
test(() => {
const target1 = host1.shadowRoot.getElementById('target');
assert_equals(target1.offsetLeft, 0);
assert_equals(target1.offsetTop, 100);
const target2 = host2.shadowRoot.getElementById('target');
assert_equals(target2.offsetLeft, 200);
assert_equals(target2.offsetTop, 200);
}, 'Anchor names in different tree scopes should not be confused');
</script>
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