browser is resized.
      </li>
      <li class="list-group-item">
        <strong>Touch and Mouse.</strong> Swipe with either touch or mouse.
      </li>
      <li class="list-group-item">
        <strong>Cursor.</strong> Changes cursor during drag.
      </li>
      <li class="list-group-item">
        <strong>Cancel.</strong> Esc-key or window loosing focus cancels the drag.
      </li>
      <li class="list-group-item">
        <strong>Transition.</strong> Default transition speed of 300ms (is 
        