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<!DOCTYPE html>
<html>
<head>
<link rel="match" href="backdrop-dynamic-style-change-ref.html">
<link rel="help" href="https://fullscreen.spec.whatwg.org/#new-stacking-layer">
<style>
dialog {
visibility: hidden;
}
::backdrop {
visibility: visible;
position: absolute;
top: 100px;
left: 100px;
height: 100px;
width: 100px;
background-color: red;
}
.green::backdrop {
background-color: green;
}
</style>
</head>
<body>
Test dynamic changes to ::backdrop style. The test passes if there is a green box below.
<dialog></dialog>
<script>
dialog = document.querySelector('dialog');
dialog.showModal();
dialog.classList.add('green');
</script>
</body>
</html>
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