Bootstrap

The Bootstrap Blog

News and announcements for all things Bootstrap, including new releases and Bootstrap Themes.

Bootstrap 4.3.0

Bootstrap v4.3 has landed with over 120 combined closed issues and merged pull requests. This release brings improvements to our utilities, some prep work for moving on to v5’s development, and the standard bug fixes and documentation updates.

During our last release, we shared a small preview of where we’re taking the project next. That’s getting clearer in the coming weeks as our attention turns towards embracing Hugo for ultra fast docs development, removing jQuery in favor of regular JavaScript, and addressing our growing code base.

Keep reading for v4.3 highlights, and see you soon with more details on v5!

Highlights

We’ve added some new utilities and deprecated some unused code. Here are the key changes in v4.3, broken down by new, improved, fixed, and deprecated.

Checkout the full v4.3.0 ship list and GitHub project for the full details.

Head to to the v4.3.x docs to see the latest in action. The full release has been published to npm and will soon appear on the Bootstrap CDN and Rubygems.

Introducing responsive font sizes

Responsive font-sizes

Our biggest new addition to Bootstrap in v4.3 is responsive font sizes, a new project in the Bootstrap GitHub org to automate calculate an appropriate font-size based on the dimensions of a visitor’s device or browser viewport. Here’s how it works:

While responsive font-sizes are disabled by default, we’ve enabled them in the custom CSS that powers our docs starting with v4.3. Please share feedback with us via GitHub issues or on Twitter. We’ve added some light guidance to our Typography docs to explain the feature. You can also learn more by reading the rfs project documentation.

Open Collective

Last December we launched our Open Collective page with our v3.4 release to help support the maintainers contributing to Bootstrap. The team has been very excited about this as a way to be transparent about maintainer costs (both time and money), as well as recognition of efforts.

Branches, Hugo, and jQuery

Right after shipping v4.3, we’ll be tackling a few key changes on our road to active v5 development. These are larger changes to how we maintain and develop Bootstrap and are considered foundational for v5.

We’ll have even more to share soon around v5’s plans after we tackle these bigger items. In the meantime, keep the feedback coming on GitHub and Twitter!

<3,
@mdo & team