Bootstrap 50 Migration Is Causing Unexpected Site Crashes Globally

Build fast, responsive sites with Bootstrap, a powerful HTML, CSS, and JS toolkit featuring Sass customization, prebuilt grid system, and JavaScript plugins. Bootstrap is a powerful, feature-packed frontend toolkit. Build anything—from prototype to production—in minutes. Get started with Bootstrap, the world’s most popular framework for building responsive, mobile-first sites, with jsDelivr and a template starter page. Download Bootstrap to get the compiled CSS and JavaScript, source code, or include it with your favorite package managers like npm, RubyGems, and more. Explore the official open-source SVG icon library for Bootstrap, featuring a wide range of customizable icons for your projects.

Versions An appendix of hosted documentation for nearly every release of Bootstrap, from v1 through v5.