Bootstrap is the most widely adopted HTML, CSS, and JavaScript framework for building responsive, mobile-first web projects. The framework provides developers with a comprehensive toolkit including utility classes, a grid system, pre-built UI components, JavaScript plugins, and responsive design patterns that enable faster web development without sacrificing customization.
The repository's primary language is MDX, and it serves as the source for both the framework code and its documentation, which is built with Astro and hosted at getbootstrap.com. Bootstrap 5 is the current development focus on the default branch, with Bootstrap 4 maintained separately on the v4-dev branch. The framework is distributed through multiple package managers including npm, yarn, Bun, Composer, and NuGet, making it accessible to developers across different technology stacks. Downloads include compiled and minified CSS and JavaScript files, source maps for debugging, and bundled JavaScript that incorporates Popper for positioning utilities.
Activity tracking reveals sustained engagement with the project.
The framework emphasizes mobile-first responsive design, providing a foundation for building websites and applications that work seamlessly across devices. Its component library includes buttons, forms, navigation, cards, modals, and numerous other UI elements that developers can use as building blocks. The CSS is built with Sass, allowing for variable customization and extension. JavaScript plugins add interactivity to components like dropdowns, tooltips, popovers, and carousels.
Bootstrap maintains comprehensive documentation with search functionality powered by Algolia's DocSearch. The project follows semantic versioning and provides previous release documentation at getbootstrap.com/docs/versions/. Contributing guidelines are clearly documented, requiring JavaScript patches to include unit tests and all code to conform to the Code Guide maintained by Mark Otto. The community extends beyond GitHub through official channels including X, a blog, GitHub Discussions, Discord, a subreddit, and IRC, providing multiple avenues for users to seek help and engage with maintainers and fellow developers.
