 style="top: 300px"><math><mspace width="11rlh"/></math></span>
      <span style="top: 310px; width: 187px"></span>

      <!-- unitless nonzero values should be ignored -->
      <span style="top: 320px"><math><mstyle mathsize="20.0"><mspace width="1em"/></mstyle></math></span>
      <span style="top: 330px; width: 10px"></span>
    </div>

    <div id="green" style="position: absolute; width: 340px; height: 340px;">
      <!-- px -->
      <span style="top: 10px"><math><mspace width="200px"/></math></spa