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<!DOCTYPE html>
<style>
dialog::backdrop {
position: absolute;
top: 100px;
left: 100px;
height: 100px;
width: 100px;
background: red;
}
#display-none-backdrop::backdrop {
display: none;
}
</style>
<body>
Test that ::backdrop is not shown for non-open or non-modal dialogs.
The test passes if there is no red shown.
<dialog id="never-opened-dialog"></dialog>
<dialog id="display-none-dialog" style="display: none"></dialog>
<dialog id="non-modal-dialog" style="visibility: hidden"></dialog>
<dialog id="display-none-backdrop" style="visibility: hidden"></dialog>
<dialog id="closed-dialog"></dialog>
<dialog id="removed-dialog"></dialog>
<script>
document.getElementById('display-none-dialog').showModal();
document.getElementById('non-modal-dialog').show();
document.getElementById('display-none-backdrop').showModal();
var closedDialog = document.getElementById('closed-dialog');
closedDialog.showModal();
closedDialog.close();
var removedDialog = document.getElementById('removed-dialog');
removedDialog.showModal();
removedDialog.parentNode.removeChild(removedDialog);
</script>
</body>
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