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<!DOCTYPE html>
<style>
dialog {
visibility: hidden;
}
dialog::backdrop {
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>
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