Read about various happenings with Baseline during June 2025.

Today we are excited to announce the Release Candidate (RC) of TypeScript 5.9! To get started using the Release Candidate, you can get it through npm with the following command: npm install -D typescript@rc Let’s take a look at what’s new in TypeScript 5.9!…

"Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers.

"Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers.

Celebrating MDN's 20th birthday with cake.

Help us understand what you want in HTML.

Today we are excited to announce the release of TypeScript 5.9! If you’re not familiar with TypeScript, it’s a language that builds on JavaScript by adding syntax for types. With types, TypeScript makes it possible to check your code to avoid bugs ahead of…

This post explains our recent effort to improve JSON.stringify performance

最近在实习的时候，遇到了一些需求，需要自己去实现 CSS 的解析、（伪）渲染流程。以之为契机，我学习了一下编译相关的知识，其中的第一环就是 Lexer。

Baseline information is now available for CSS properties in the Elements panel of Chrome DevTools!

Read about various happenings with Baseline during July 2025.

Discover some of the interesting features that have landed in stable and beta web browsers during July 2025.

In this chapter, we take the very first steps with JavaScript and learn about numbers, variables and functions.

This blog post provides an overview of my new series of blog posts called “Learning web development”.

In the last chapter, we worked with numbers. In this chapter, we’ll work with text and write our first applications.

In this chapter we look at one way of storing more than one value in a variable: arrays.