XSSFilter could not parse (X)HTML:
<p>To see this as a Slideshow:</p>
<ul>
<li>On Firefox install <a href="https://addons.mozilla.org/en-US/firefox/addon/4650">FullerScreen</a>
<ul>
<li>Supposedly it works in Opera out-of-the-box</li>
</ul></li>
<li>Go to <a href='/en/Slideshow_Sandbox.slides'>Slideshow_Sandbox.slides</a></li>
<li>Press F11</li>
</ul>
<p>Once you are in the slideshow, it will look like this:</p>
<p><a href="http://media.freewisdom.org/etc/slideshow_demo.png"
<img src="http://media.freewisdom.org/etc/slideshow_demo_small.png"/>
</a></p>
<p>Use "Page Up" and "Page Down" to navigate.</p>
<h2>Slide Number One</h2>
<h3>Lorem ipsum dolor sit amet</h3>
<p>(consectetur adipisicing elit, sed do eiusmod
tempor incididunt ut labore et dolore magna aliqua.) </p>
<ul>
<li>Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi</li>
<li>Ut aliquip ex ea commodo consequat. </li>
</ul>
<h2>Duis Aute Irure Dolor</h2>
<p>In reprehenderit in voluptate: </p>
<pre><code>velit.esse = (cillum(dolore+eu+fugiat)==nulla)
</code></pre>
<p>Pariatur?</p>
<p>Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
officia deserunt mollit anim id est laborum.</p>