Don't use it, there's nothing interesting here.
A UI and mobile framework based on Zepto and Backbone. The goal is to reproduce something similar to jQuery Mobile but more lightweight, since the combo Zepto+Backbone is much lighter than jQuery+jQueryMobile.
The target is to target mobile webkit browser first (because of Zepto), and based on Zepto evolutions more mobile browsers.
Credits to the (abandonned) Zepto UI for the idea and most of the css.