Twitter employees started developing Bootstrap thinking about a framework that’s going to be consistent above all else. By solving the consistency issues between the development front and the end-users Bootstrap became the number one framework among web developers. The main problem is solved are various inconsistencies that exist between developers and designers on a project because Bootstrap’s final results always look the same on every platform and every browser. By recognizing the need to pair the designers and developers, Bootstrap became an open-source framework in 2011.
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