File: backdrop-dynamic-style-change.html

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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>