File: top-layer-parent-mask.html

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<!DOCTYPE html>
<html>
<title>Test that parent mask does not affect top layer elements</title>
<meta charset="utf-8">
<link rel="author" title="Tim Nguyen" href="https://github.com/nt1m">
<link rel="match" href="green-dialog-and-backdrop.html">
<link rel="help" href="https://fullscreen.spec.whatwg.org/#new-stacking-layer">
<style>
body { background: red; }

#parent {
    mask-image: radial-gradient(black, transparent);
    mask-size: 100px;
}

dialog::backdrop,
dialog {
    background: green;
    outline: none;
}
</style>
<body>
<div id="parent">
    <dialog>PASS if no red shows</dialog>
</div>
<script>
    document.querySelector("dialog").showModal();
</script>
</body>
</html>