Bootstrap

Responsive CSS component framework — grid system, pre-built components, and the web's most widely used frontend toolkit.

JavaScript free Open Source web since 2011

Bootstrap’s 12-column grid and pre-built components (navbar, modal, card, form) allowed developers to build responsive sites without design skills. It dominated web development in the 2010s and its approach of component classes influenced virtually every CSS framework that followed. Bootstrap 5 dropped jQuery and added CSS custom properties throughout.

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cssfrontendresponsivecomponentsuigridjquery
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