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，与CSS框架Blueprint存在很多相似之处。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。 [2]
　　Bootstrap 2.0的一个重大改进是添加了响应设计特性，在1.0中它并不支持，这让很多开发人员抱怨。而且为了提供更好地针对移动设备的响应式设计方案，Bootstrap 2.0采用了更为灵活的12栏网格布局。此外，它还更新了一些进度栏以及可定制的图片缩略图，并增加了一些新样式。值得关注的是，Bootstrap是一个非常轻量级的框架，2.0在压缩后也只有10KB。,Bootstrap Twitter launched an open source toolkit for front-end development. It jointly developed by Twitter designer Mark Otto and Jacob Thornton, a CSS/HTML framework. Bootstrap provides elegant HTML and CSS specification, it is written by the the dynamic CSS language Less, there are a lot of similarities with the CSS framework Blueprint. Bootstrap once popular after the release, has been a popular open source project on GitHub, including NASA MSNBC (Microsoft NBC) Breaking News using the project. [2] Bootstrap 2.0 a significant improvement is the addition of a response design features, it does not support 1.0, which makes a lot of developers complain. In order to provide better responsive design for mobile devices, Bootstrap 2.0 uses a more flexible 12-column grid layout. In addition, it also updates the progress bar and can be customized picture thumbnail and added some new styles. Concern, Bootstrap is a very lightweight framework 2.0 compressed only 10KB.