Otto announced Bootstrap 4 on October 29, 2014.[13] The first alpha version of Bootstrap 4 was released on August 19, 2015.[14] The first beta version was released on August 10, 2017.[15] Otto suspended work on Bootstrap 3 on September 6, 2016, to free up time to work on Bootstrap 4. Bootstrap 4 was finalized on January 18, 2018.[16]
Significant changes include:
- Major rewrite of the code
- Replacing Less with Sass
- Addition of
Reboot, a collection of element-specific CSS changes in a single file, based onNormalize - Dropping support for IE8, IE9, and iOS 6
- CSS Flexible Box support
- Adding navigation customization options
- Adding responsive spacing and sizing utilities
- Switching from the pixels unit in CSS to root ems
- Increasing global font size from 14px to 16px for enhanced readability
- Dropping the
panel,thumbnail,pager, andwellcomponents - Dropping the
Glyphiconsicon font - Huge number[quantify] of utility classes
- Improved form styling, buttons, drop-down menus, media objects and image classes
Bootstrap 4 supports the latest versions of Google Chrome, Firefox, Internet Explorer, Opera, and Safari (except on Windows). It additionally supports back to IE10 and the latest Firefox Extended Support Release (ESR).[17]
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