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chromium/third_party/blink/web_tests/external/wpt/html/semantics/interactive-elements/the-dialog-element/dialog-open-2.html 

<!DOCTYPE html>
<link rel=author href="mailto:[email protected]">
<link rel=author href="mailto:[email protected]">
<link rel=help href="https://html.spec.whatwg.org/multipage/interactive-elements.html#the-dialog-element">
<link rel=help href="https://bugs.webkit.org/show_bug.cgi?id=90931">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<dialog id=mydialog>It's my dialog.</dialog>

<script>
test(() => {
  const dialog = document.getElementById('mydialog');
  let computedStyle = window.getComputedStyle(dialog, null);
  assert_equals(computedStyle.getPropertyValue('display'), 'none');

  dialog.show();
  computedStyle = window.getComputedStyle(dialog, null);
  assert_equals(computedStyle.getPropertyValue('display'), 'block');

  dialog.close();
  computedStyle = window.getComputedStyle(dialog, null);

  assert_equals(computedStyle.getPropertyValue('display'), 'none');
  dialog.close();
}, "Tests that dialog is visible after show() is called and not visible after close() is called.");
</script>