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<!DOCTYPE html>
<style>
#dialog {
position: absolute;
top: 100px;
left: 100px;
height: 100px;
width: 100px;
background: green;
}
#dialog-before {
position: absolute;
top: 0px;
}
#dialog-after {
position: absolute;
bottom: 0px;
}
#dialog-backdrop {
position: absolute;
top: 100px;
left: 300px;
height: 100px;
width: 100px;
background: green;
}
</style>
<body>
Test for a modal dialog with ::before, ::after, and ::backdrop. The test passes
if there are two green boxes, one with the texts "::before" and "::after" in it.
<div id="dialog">
<div id="dialog-before">::before</div>
<div id="dialog-after">::after</div>
</div>
<div id="dialog-backdrop"></div>
<script>
document.querySelector('dialog').showModal();
</script>
</body>