     <span style="top: 200px; width: 20ch"></span>

      <!-- cap -->
      <span style="top: 230px"><math><mspace width="30cap"/></math></span>
      <span style="top: 220px; width: 30cap"></span>

      <!-- ic -->
      <span style="top: 250px"><math><mspace width="20ic"/></math></span>
      <span style="top: 240px; width: 200px"></span>

      <!-- rem -->
      <span style="top: 270px"><math><mspace width="10rem"/></math></span>
      <span style="top: 260px; width: 160px"></span>

      <!-- lh -->
