h</code>: uses maximum width of window</li>
<li><code>real</code>: uses real size (equivalent to 100% zoom)</li>
<li><code>default</code>: uses viewer default mode</li>
</ul>
or a number indicating the zooming factor to use.
</dd>
<dt><code>layout</code></dt>
<dd>
The page layout. Possible values are:
<ul>
<li><code>single</code>: displays one page at once</li>
<li><code>continuous</code>: displays pages continuously</li>
<li><code>two</code>: displays two pages on two columns</li>
<li><code>de