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<!DOCTYPE html>
<title>CSS Position Test: Replaced &lt;object&gt; renders ::backdrop in top layer</title>
<link rel="match" href="/css/reference/green.html">
<style>
object.green::backdrop { background-color: green; visibility: visible; }
object { visibility: hidden; }
</style>
<object id="pop" popover="auto"></object>
<script>
pop.showPopover();
pop.className = "green";
</script>