Bootstrap is a free and open-source front-end web framework for designing websites and web applications.
Bootstrap, originally named Twitter Blueprint, was developed by Mark Otto and Jacob Thornton at Twitter as a framework to encourage consistency across internal tools.

On  August 19, 2011  It was renamed from Twitter Blueprint to Bootstrap, and released as an open source project.

Bootstrapis available under  MIT License (Apache License 2.0 prior to 3.1.0).
Original author(s): Mark Otto, Jacob Thornton
Initial release date: August 2011
Stable release: 4.0.0 / January 18, 2018
Written in: HTMLCascading Style SheetsLess (v3), Sass (v4), JavaScript
Popular For: Mobile Responsive Website and Fast and easy UI Design.


On January 31, 2012, Bootstrap 2 was released, which added a twelve-column responsive grid layout system, inbuilt support for Glyphicons, several new components, as well as changes to many of the existing components.

On August 19, 2013, Bootstrap 3 was released, which redesigned components to use flat design, and a mobile first approach.

On October 29, 2014, Mark Otto announced that Bootstrap 4 was in development.

On August 19, 2015 the first alpha version of Bootstrap 4 was released on August 19, 2015.

On 10 August 2017 the first beta version was released.

On 18 January 2018 the first Stable release version was released.


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