SET"><code>TYPE_UNSET</code></a> (i.e. horizontal), this is the horizontal position relative to
       the left of the viewport. Note that positioning is relative to the left of the viewport
       even in the case of right-to-left text.
   <li>For <a href="#VERTICAL_TYPE_LR"><code>VERTICAL_TYPE_LR</code></a> and <a href="#VERTICAL_TYPE_RL"><code>VERTICAL_TYPE_RL</code></a> (i.e. vertical), this is the
       vertical position relative to the top of the viewport.
 </ul></div>
</li>
</ul>
<a id="positionAnch