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<!DOCTYPE html>
<style>
dialog {
padding: 0px;
border: none;
margin: 0px;
top: 100px;
left: 100px;
height: 100px;
width: 100px;
background: green;
}
dialog::before {
content: '::before';
position: absolute;
top: 0px;
}
dialog::after {
content: '::after';
position: absolute;
bottom: 0px;
}
dialog::backdrop {
position: absolute;
top: 100px;
left: 300px;
height: 100px;
width: 100px;
background: green;
content: 'THIS TEXT SHOULD NOT BE SEEN';
}
dialog::backdrop::before {
content: '::backdrop::before';
position: absolute;
top: 0px;
background: red;
}
dialog::backdrop::after {
content: '::backdrop::after';
position: absolute;
bottom: 0px;
background: red;
}
</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.
<dialog></dialog>
<script>
document.querySelector('dialog').showModal();
</script>
</body>
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