g="Maple">x (Maple)</annotation>
              <annotation-xml encoding="MathML-Content"><ci>x</ci></annotation-xml>
              <annotation-xml encoding="OpenMath"><OMV name="x"/></annotation-xml>
            </semantics>
          </math>
        </li>
      </ul>
    </li>
    <li>About Box: <input type="button" onclick="MathJax.Menu.About()" value="Show About Box"/></li>
    <li>WebkitNativeMMLWarning: <input type="button" onclick="switchRendererWarning('WebkitNativeMMLWarning')" value="Show alert box