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Bootstrap is a concise, intuitive and powerful front-end development framework based on HTML, CSS and JavaScript libraries, cooperatively developed by the designers Mark Otto and Jacob Thornton from Twitter, which makes the Web development easier and more efficient. It became popular the time it was launched. Many companies including NASA, MSNBC have started to use this free and open-source project very early. Even some popular mobile development frameworks are developed on the basis of Bootstrap source code, just feature some improvements on performance.