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chromium/third_party/blink/web_tests/external/wpt/html/semantics/popovers/popover-hidden-display.html 

<!DOCTYPE html>
<meta charset="utf-8">
<link rel=author href="mailto:[email protected]">
<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-hidden-display-ref.html">
<meta name=fuzzy content="0-1;0-15">

<div class=nottoplayer popover                           >This content should be visible and green</div>
<div class=nottoplayer popover=invalid style="top:100px;">This content should be visible and green</div>
<div class=toplayer    popover         style="top:200px;">This content should be visible and green</div>

<style>
  [popover] {
    display: block; /* This should make the popover visible */
    top: 0;
    margin:10px;
    width: 300px;
    height: 50px;
  }
  [popover].nottoplayer {
    background: green;
  }
  [popover].toplayer {
    background: red;
  }
  [popover].toplayer:popover-open {
    background: green;
  }
  [popover].nottoplayer:popover-open {
    background: red;
  }
</style>
<script>
  const toplayer = document.querySelectorAll('[popover].toplayer');
  if (toplayer.length !== 1)
    document.write('FAIL');
  toplayer[0].showPopover();
</script>