ault.</li>
      <li>If the platform's normal behaviour is not to cancel a drag (eg. Mac and Unix+Gnome), then the drag should not be cancelled; moving the mouse outside the black square should cause the drag placeholder to continue following the mouse, and the mouse cursor should show as no-drop or drop-allowed.</li>
      <li>Fail in either case if the drag placeholder gets stuck temporarily or permanently over the blue square. Fail if an inappropriate middle click function begins (eg. paste-and-go).</li>