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<!DOCTYPE html>
<html>
<meta charset="utf-8">
<link rel="stylesheet" href="resources/dialog.css">
<style>
body { background: red; }
.backdrop {
display: block;
position: fixed;
top: 0;
left: 0;
right: 0;
bottom: 0;
}
.backdrop,
.pseudodialog {
background: green;
}
</style>
<body>
<div class="backdrop"></div>
<div class="pseudodialog">PASS if no red shows</div>
</body>
</html>