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<!DOCTYPE html>
<title>CSS Anchor Positioning: position-try-options on ::backdrop</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#fallback-apply">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
@position-try --pt {
left: 300px;
}
#anchor {
width: 100px;
height: 100px;
margin-left: 150px;
margin-top: 50px;
background: coral;
}
dialog::backdrop {
background: seagreen;
width:100px;
height:100px;
left: 9999px; /* Force overflow */
position-try-options: --pt;
}
</style>
<div id=anchor>Anchor</div>
<dialog id=dialog>Dialog</dialog>
<script>
test((t) => {
dialog.showModal();
let style = getComputedStyle(dialog, '::backdrop');
assert_equals(style.left, '300px');
}, '::backdrop can use position-try-options');
</script>
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