<p>Here&#39;s a simple block:</p>
<div>
    foo
</div>
<p>This should be a code block, though:</p>
<pre><code>&lt;div&gt;
    foo
&lt;/div&gt;
</code></pre>
<p>As should this:</p>
<pre><code>&lt;div&gt;foo&lt;/div&gt;
</code></pre>
<p>Now, nested:</p>
<div>
    <div>
        <div>
            foo
        </div>
    </div>
</div>
<p>This should just be an HTML comment:</p>
<!-- Comment -->
<p>Multiline:</p>
<!--
Blah
Blah
-->
<p>Code block:</p>
<pre><code>&lt;!-- Comment --&gt;
</code></pre>
<p>Just plain co