Getting Started

Migrating to v4 · Bootstrap Bootstrap 4 is a major rewrite of almost the entire project. The most notable changes are summarized immediately below, followed by more specific class and behavioral changes to relevant components. Heads up! This will be in flux as work on the v4 alphas progresses. Until then consider it incomplete, and we’d love pull requests to help keep it up to date. Summary Here are the big ticket items you’ll want to be aware of when moving from v3 to v4. Browser support Dropped IE8, IE9, and iOS 6 support. v4 is now only IE10+ and iOS 7+. Global changes Flexbox is enabled by default. Grid system Added support for flexbox in the grid mixins and predefined classes. Components Dropped panels, thumbnails, and wells for a new all-encompassing component, cards. Misc Non-responsive usage of Bootstrap is no longer supported. By component This list highlights key changes by component between v3.x.x and v4.0.0. Reboot Typography Moved all .text- utilities to the _utilities.scss file. Images Tables Forms Buttons Dropdowns