chromium/content/test/data/accessibility/aria/aria-modal-remove-parent-container.html

<!DOCTYPE html>
<html>
<body onload="loaded()">
  <button id="outerButton" aria-label="Should be in tree"></button>
  <div id="dialogContainer">
    <div role="dialog" aria-label="modal dialog" aria-modal="true">
      <button id="innerButton">Inner Button</button>
    </div>
  </div>

  <script>
    // Test that when an active ARIA modal dialog is removed from the tree, the
    // tree is no longer pruned.

    // Note: This test checks an edge case in the aria-modal pruning logic. This
    // logic currently only runs on Mac, so there are only mac expectations for
    // this test. See aria-modal.html for more information on tree pruning.
    function loaded() {
      innerButton.focus();
      dialogContainer.remove();
    }
  </script>
</body>
</html>