Bootstrap是Twitter推出的一个开源的用于前端开发的工具包。它由Twitter的设计师Mark Otto和Jacob Thornton合作开发，是一个CSS/HTML框架。Bootstrap提供了优雅的HTML和CSS规范，它即是由动态CSS语言Less写成。Bootstrap一经推出后颇受欢迎，一直是GitHub上的热门开源项目，包括NASA的MSNBC（微软全国广播公司）的Breaking News都使用了该项目。-Bootstrap is Twitter' s an open source toolkit for front-end development. Twitter designer Mark Otto and Jacob Thornton to develop a CSS/HTML framework. Bootstrap provides elegant HTML and CSS specification, which is written by the dynamic CSS language Less. Bootstrap once launched popular has been the most popular open source projects on GitHub, including NASA MSNBC (Microsoft NBC) Breaking News of the project.