Bootstrap

An open source toolkit for building responsive, mobile-first projects on the web with HTML, CSS, and JavaSсript. Enables to quickly prototype ideas or build the entire app using Sass variables and mixins, responsive grid system, extensive prebuilt components, and powerful plugins built on jQuery.

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First released 2011
Developed by Twitter
Latest stable version Bootstrap 4
Open-source Yes

Interesting facts

CSS frameworks began appearing in response to the proliferation of new mobile devices around 2010-2011. Thus, a year after the launch of the first iPad in 2010, Bootstrap appeared, and there have since been over 20 releases. Prior to being an open-sourced framework, Bootstrap was known as Twitter Blueprint. Today, it is one of the most popular front-end frameworks and open source projects in the world.

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Development by Synergize.digital