top-layer-remove-popover-attribute-ref.html

<!DOCTYPE html>
<html>
<meta charset="utf-8">
<head>
  <title>Shown modal dialog where the popover attribute is removed</title>
</head>
<body>
  <dialog popover style="padding: 2em"></dialog>
  <script>
    const d = document.querySelector("dialog");
    d.showModal();
  </script>
</body>
<html>

chromium/third_party/blink/web_tests/external/wpt/html/semantics/interactive-elements/the-dialog-element/top-layer-remove-popover-attribute-ref.html