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chromium/third_party/blink/web_tests/external/wpt/html/semantics/interactive-elements/the-dialog-element/top-layer-position.html 

<!DOCTYPE html>
<link rel=author href="mailto:[email protected]">
<link rel=help href="https://html.spec.whatwg.org/multipage/interactive-elements.html#the-dialog-element">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<body>
<script>
test(() => {
  const dialog = document.createElement('dialog');
  document.body.appendChild(dialog);

  dialog.style = 'position:static';
  assert_equals(getComputedStyle(dialog).position, 'static');
  dialog.showModal();
  assert_true(dialog.open);
  assert_equals(getComputedStyle(dialog).position, 'absolute',
    `dialog should be position:absolute when element.style has position:static.`);
  dialog.close();
  assert_false(dialog.open);

  dialog.style = 'position:relative';
  assert_equals(getComputedStyle(dialog).position, 'relative');
  dialog.showModal();
  assert_true(dialog.open);
  assert_equals(getComputedStyle(dialog).position, 'absolute',
    `dialog should be position:absolute when element.style has position:relative.`);
  dialog.close();
  assert_false(dialog.open);
}, `Verifies that position:static and position:relative computed to position:absolute in the top layer.`);
</script>