Best JavaScript Markdown library
<p>What is the most flexible, advanced and mature JavaScript library for handling <a href="http://en.wikipedia.org/wiki/Markdown">Markdown</a> markup? </p>

<p>It would be nice if it also provides syntax for inserting arbitrary HTML code as well. </p>

<p><em>UPD:</em> downvoters, it would be nice if you will explain, why this question get down votes?</p>
