showdownjs/test/extensions/twitter/basic.html

<p>Testing of the twitter extension.</p>

<p>Ping <a href="http://twitter.com/andstuff">@andstuff</a> to find out more about <a href="http://twitter.com/search/%23extensions">#extensions</a> with showdown</p>

<p>And @something shouldn't render as a twitter link</p>