Bootstrap is a front-end framework from Twitter designed to kick-start development of webapps and sites.
Bootstrap is a front-end framework from Twitter designed to kickstart the front-end development of webapps and sites. Among other things, it includes base CSS and HTML for typography, icons, forms, buttons, tables, layout grids, navigation along with custom-built jQuery plug-ins and support for responsive layouts.
It is tested and supported in the major modern browsers, such as the latest versions of Safari, Google Chrome, Firefox 5+, and Internet Explorer 7+. Mobile browsers are supported by Bootstrap versions 2.0 and later.
There are two major version of the framework: