showdownjs/test/cases/github-style-codeblock.html

<p>Define a function in javascript:</p>

<pre><code>function MyFunc(a) {
    var s = '`';
}
</code></pre>

<p>And some HTML</p>

<pre><code class="html">&lt;div&gt;HTML!&lt;/div&gt;
</code></pre>