spacer-with-popover-top-layer-ref.html

<!doctype html>
<meta charset="utf8">
<title>CSS Content Visibility: popover shows under c-v auto (ref)</title>

<style>
.box { width: 100px; height: 100px; border: 1px solid black; }
.spacer { width: 10px; height: 3000px; background: lightblue; }
</style>

<div class=spacer></div>
<div id=container class=box>
content
<div popover id=popover>PASS<div id=inner></div></div>
</div>

<script>
popover.showPopover();
</script>

chromium/third_party/blink/web_tests/external/wpt/css/css-contain/content-visibility/spacer-with-popover-top-layer-ref.html