Link the skill-bar.css stylesheet:
<link rel="stylesheet" href="css/skill-bar.css">
and include the skill-bar.js script:
<script src="js/skill-bar.js"></script>
Here's the code for the first bar in the demo:
<div class="skillbar clearfix" data-percent="20%">
<div class="skillbar-title" style="background: #d35400;"><span>HTML5</span></div>
<div class="skillbar-bar" style="background: #e67e22;"></div>
<div class="skill-bar-percent">20%</div>
</div>
Jquery.
http://codepen.io/anon/pen/waaqLq
Disclaimer: I did not make this. It seems to have been made anonymously and since the license allowed it, I decided to put it up on Github for convenience.