In 2018, Bootstrap 4 was released and marked a major upgrade in the framework’s history.
- It switched from Less to Sass, making customization easier.
- Flexbox was adopted for layouts, which improved responsiveness and alignment.
- New components like cards were introduced.
- Forms and utility classes became more flexible.
- Support for old browsers like Internet Explorer 8 and 9 was removed.
For many developers, Bootstrap 4 became a game-changer in creating powerful, modern web applications.