A markdown project for bbs.byr.cn. But you can also use it in browsers. Based on marked & hightlightjs & jQuery
<!doctype html>
<html>
<head>
<meta charset="utf-8"/>
<title>Marked in the browser</title>
<style type="text/css" src="css/gfm-style.min.css"></style>
<script src="http://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script>
<script src="js/mdRender.js"></script>
</head>
<body>
<pre class="markdown"># Helloworld
</pre>
<script>
md_init();
</script>
</body>
</html>