Foundation 3 is built on ZURB’s 14 years of experience at building sites and apps for the Web. It is built with Sass, a powerful CSS preprocessor, which allows us to much more quickly develop Foundation itself, as well as sites built with it. You can use the Sass or straight CSS version of Foundation.
New button elements, new navigation types, new form styles and options, and tons of streamlining make this the fastest way to prototype responsively, and to take that code and go right to production. Foundation 3 works all the way back to IE8, they are taking advantage of new, awesome Web technology to help you build better and faster.
Go to : http://foundation.zurb.com/