example take from http://www.w3resource.com/twitter-bootstrap/grid-system-tutorial.php

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w3resource offers web development tutorials. We believe in Open Source. Love standards. And prioritize simplicity and readability while serving content. With 3000+ unique content pages and thousands of examples, we are comprehensive. We have online practice editors to play around with the example codes.

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Fontend Development:

HTML4.0, XHTML1.0, CSS2.1, HTML5, CSS3, JavaScript

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PHP, Ruby, Python, Java, ASP.NET, SCALA

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Google Plus API, Twitter Bootstrap, JSON, Firebug, WebPNG