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<!DOCTYPE html>
<meta charset="utf-8">
<link rel=author href="mailto:masonf@chromium.org">
<link rel=help href="https://open-ui.org/components/popover.research.explainer">
<link rel=help href="https://html.spec.whatwg.org/multipage/popover.html">
<link rel=match href="popover-open-display-ref.html">
<div popover>This is a popover</div>
<div class=topmost></div>
<style>
.topmost {
position:fixed;
z-index: 999999;
top:0;
left:0;
width:1000px;
height:1000px;
background:green;
margin:0;
padding:0;
}
</style>
<script>
document.querySelector('[popover]').showPopover();
</script>
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