He uses Emmet, http://emmet.io/
Emmet converts CSS syntax style code to HTML. For instance ul > li*3 > a[href=#] would be converted to
<ul>
<li><a href="#"></a></li>
<li><a href="#"></a></li>
<li><a href="#"></a></li>
</ul>
You can download it using the package control in Sublime Text. If you don't have Package Control downloaded, you can follow the simple instructions here: https://packagecontrol.io/installation
Enjoy! :)