File: popover-hidden-appearance.html

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<!DOCTYPE html>
<meta charset="utf-8" />
<link rel="author" href="mailto:masonf@chromium.org">
<link rel=help href="https://html.spec.whatwg.org/multipage/popover.html">
<link rel=help href="https://issues.chromium.org/issues/393947100">
<link rel="match" href="/compat/green-ref.html">

<div popover></div>
<div id=blocker></div>

<style>
  div {
    position: fixed;
    inset:auto;
    top:8px;
    left:8px;
    width: 100px;
    height: 100px;
    padding:0;
    border:0;
  }
  [popover] {
    display:block;
    background-color:red;
  }
  #blocker {
    background-color:green;
  }
</style>

<script>
  const popover = document.querySelector('[popover]');
  popover.showPopover();
  popover.hidePopover();
  // The popover should still be display:block, but not in the top layer.
</script>