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<!DOCTYPE html>
<meta charset="utf-8" />
<title>Popover ::backdrop pseudo element appearance</title>
<link rel="author" href="mailto:masonf@chromium.org">
<link rel=help href="https://open-ui.org/components/popup.research.explainer">
<link rel="match" href="popover-backdrop-appearance-ref.tentative.html">
<style>
#bottom { top: 70px; left: 70px; }
#middle { top: 120px; left: 120px; }
#top { top: 170px; left: 170px; }
::backdrop { height: 200px; width: 200px; }
#bottom::backdrop {
top: 50px;
left: 50px;
background-color: rgb(0, 50, 0);
z-index: 100; /* z-index has no effect. */
}
#middle::backdrop {
top: 100px;
left: 100px;
background-color: rgb(0, 130, 0);
z-index: -100; /* z-index has no effect. */
}
#top::backdrop {
top: 150px;
left: 150px;
background-color: rgb(0, 210, 0);
z-index: 0; /* z-index has no effect. */
}
[popover] {
margin:0;
}
</style>
<p>Test for [popover]::backdrop presence and stacking order. The test passes
if there are 3 stacked boxes, with the brightest green on top.</p>
<div popover id=bottom>Bottom
<div popover id=middle>Middle
<div popover=manual id=top>Top</div>
</div>
</div>
<script>
document.getElementById('bottom').showPopover();
document.getElementById('middle').showPopover();
document.getElementById('top').showPopover();
</script>
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