File: backdrop-in-flow.html

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thunderbird 1%3A140.4.0esr-1
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<!DOCTYPE html>
<link rel="match" href="backdrop-in-flow-ref.html">
<link rel="help" href="https://fullscreen.spec.whatwg.org/#new-stacking-layer">
<style>
dialog {
    visibility: hidden;
}

dialog::backdrop {
    visibility: visible;
    height: 100px;
    width: 50px;
}

#left::backdrop {
    position: static;
    top: 100px;
    left: 100px;
    background: green;
}

#right::backdrop {
    position: relative;
    background: green;
    top: 100px;
    left: 150px;
}
</style>
<body>
Test that position 'static' or 'relative' for ::backdrop computes to 'absolute'.
The test passes if there is a single green box.
<dialog id="left"></dialog>
<dialog id="right"></dialog>
</div>
<script>
document.querySelector('#left').showModal();
document.querySelector('#right').showModal();
</script>
</body>