About eight months ago we **[open-sourced our progress](https://tailwindcss.com/blog/tailwindcss-v4-alpha)** on Tailwind CSS v4.0. Hundreds of hours of fixing bugs, soul-crushing backward compatibility work, and troubleshooting Windows CI failures later, I’m excited to finally tag the first public beta release.

As I talked about when we published the first alpha, Tailwind CSS v4.0 is an all-new engine built for performance, and designed for the modern web.

* **Built for performance** — full builds in the new engine are up to 5x faster, and incremental builds are over 100x faster — and measured in microseconds.

* **Unified toolchain** — built-in import handling, vendor prefixing, and syntax transforms, with no additional tooling required.

* **CSS-first configuration** — a reimagined developer experience where you customize and extend the framework directly in CSS instead of a JavaScript configuration file.

* **Designed for the modern web** — built on native cascade layers, wide-gamut colors, and including first-class support for modern CSS features like container queries, **`@starting-style`**, popovers, and more.

There’s so much more to say, but everything you need to get started is in the new beta documentation we published today:

**[Get started with Tailwind CSS v4.0 Beta 1 →](https://tailwindcss.com/docs/v4-beta)**

Start building and help us bullet-proof this thing for the stable release early in the new year.

Pajak365

Kopas Mysql

Halo

For 15 years, our beloved Calibri was Microsoft's default font and crown keeper of office communications, but as you know, our relationship has come to a [natural end](https://medium.com/microsoft-design/beyond-calibri-finding-the-next-microsoft-365-default-font-5ef83f028be2). We changed. The technology we use every day has changed. And so, our search of the perfect font for higher resolution screens began. The font needed to have sharpness, uniformity, and be great for display type. It was exciting at times, but also intimidating. How do you replace Calibri? How do you find that one true font that can take its place as the rightful default?

As we [shared](https://medium.com/microsoft-design/beyond-calibri-finding-the-next-microsoft-365-default-font-5ef83f028be2) before, Microsoft commissioned five new fonts: Bierstadt, Grandview, Seaford, Skeena, and Tenorite. It was our hope that one of them would be our next default font for Microsoft 365. All of them were added to the drop-down font picker. From there, as you got a chance to use them, we listened to your impassioned [feedback](https://twitter.com/Microsoft/status/1387421384582733827) and chose the one that resonated most which was Bierstadt. But as there was a change of guard so too the name. Bierstadt is now known as Aptos.

Less Summer

2022