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<!DOCTYPE html>
<title>Non-top-layer element cannot anchor to top-layer element</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#target-anchor-element">
<link rel="author" href="mailto:xiaochengh@chromium.org">
<link rel="match" href="anchor-position-top-layer-ref.html">
<style>
#anchor {
position: absolute;
top: 300px;
left: 200px;
width: 100px;
height: 100px;
background: orange;
anchor-name: --a;
}
#target {
position: fixed;
top: anchor(--a bottom, 200px);
left: anchor(--a left, 300px);
width: 100px;
height: 100px;
background: lime;
anchor-default: --a;
}
body {
margin: 0;
height: 300vh;
}
dialog {
margin: 0;
border: 0;
padding: 0;
inset: auto;
outline: none;
}
dialog::backdrop {
background: transparent;
}
</style>
<dialog id="anchor"></dialog>
<div id="target"></div>
<script>
anchor.showModal();
document.scrollingElement.scrollTop = 100;
</script>
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