When did bootstrap become open source?

#When did bootstrap become open source?

bootstrap was released as an open source project on August 19, 2011.

Bootstrap, formerly known as Twitter Blueprint, was written by Mark Otto and Jacob Thornton of Twitter. Its original intention was to create a set of tools and frameworks that could maintain consistency. Before Bootstrap, developing interfaces required using different code libraries, which could easily lead to inconsistencies and increase the burden of maintenance. Twitter developer Mark Otto said:

"I worked with a few developers to design and create a new tool for internal use, and then we saw an opportunity to do more. From there, we found that we The designed tools were more powerful than those designed by others. A few months later, we made a prototype of Bootstrap and shared documents, designs and resources within the company."

After several months of hard work by a team, Many developers at Twitter regarded it as part of Hack Week (a hackathon-like week popular among Twitter developers) and began to participate in development.

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

On January 31, 2012, Bootstrap 2 was released. This version adds a twelve-column grid layout and responsive components, and makes changes to many components. Bootstrap 3 was released on August 19, 2013. It began to prioritize mobile devices and began to use flat design.

On April 23, 2015, Mark Otto announced that Bootstrap 4 was being developed. The first alpha version of Bootstrap 4 was deployed on August 19, 2015.

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