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    <ol>
      <li>Drag the pink square over the blue square.</li>
      <li>Without releasing the drag, click the middle mouse button.</li>
      <li>If the platform's normal behaviour is to cancel a drag (eg. Windows and Unix+KDE), then the drag should be cancelled; moving the mouse outside the black square should not cause the drag placeholder to continue following the mouse, and the mouse cursor should revert to def