August 19, 2013
Bootstrap 3 released
Bootstrap 3.0 shipped on August 19, 2013 — a flat, mobile-first redesign that defined responsive web UIUser interface — the parts of software people see and interact with. for the mid-2010s.
What it was for
Bootstrap 3 dropped gradients for flat design and made mobile breakpoints the default — `col-xs-12`, responsive navbars, and glyphicons in every tutorial. It shipped in Laravel, WordPressA PHP CMS powering millions of sites — themes, plugins, and the block editor for publishing. admin themes, and internal dashboards until Bootstrap 4's flexbox rewrite.
Why it's here
Bootstrap 3 codified mobile-first responsive design for mainstream developers.
Why it mattered
Its grid and components became the visual language of the responsive web era.
What it solved
TeamsMicrosoft Teams — chat, video calls, and Office integration for workplace collaboration. rebuilt the same responsive layouts and media queries for every new project.
Media
- ImageBootstrap (front-end framework)
Bootstrap, Public domain, via Wikimedia Commons
Related
- Bootstrap releasedAugust 19, 2011
- Bootstrap 4 releasedJanuary 18, 2018
- jQuery 1.0 releasedAugust 26, 2006