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Bootstrap released it as an open source project on August 19th, 2011.

Bootstrap, formerly known as Twitter Blueprint, was written by Mark Otto and Jacob Thornton of Twitter, and was intended to create a set of tools and frameworks that can maintain consistency. Before Bootstrap, the development interface needed to use different code bases, which could easily lead to inconsistencies, thus increasing the burden of maintenance. Mark Otto, the Twitter developer, said:

"I worked with several developers to design and create a new tool for internal use, and then we found an opportunity to do more. Since then, we found that the tool we designed was stronger than others. A few months later, we made a prototype of Bootstrap, sharing documents, designs and resources within the company."

After a few months of effort by a team, many Twitter developers began to participate as part of Hack Week (a week similar to hackathon, which is popular among Twitter developers).

Twitter Blueprint was renamed Bootstrap and released as an open source project on August 19th, 2011. Since then, the project has continued to be maintained by Mark Otto, Jacob Thornton and a core development team, as well as numerous contributors from the community.

On January 31, 2012, Bootstrap 2 was released. Twelve columns of grid layout and responsive components have been added to this version, and many components have been modified. Bootstrap 3, released on August 19, 2013, began to prioritize mobile devices as a policy, and began to use flat design.

On April 23rd, Mark Otto announced that it was developing Bootstrap 4. The first alpha version of Bootstrap 4 was deployed on August 19th, 2015.

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