Descriptive set theorists study the niche mathematics of infinity. Now, they’ve shown that their problems can be rewritten in the concrete language of algorithms.

MDN turns 20! Let's look at how we started, how MDN became the most trusted resource for web developers, the impact it's had on the open web, and yes, there's cake, too.

Jan 23rd 6:30PM: \*\* General Info\*\* Hey, React Amsterdam Community! We’re excited to share that the 2025 meetup season is just around t

Help the Yeti get home. Play Debug December and win cool prizes.

A fun little form validation and CSS selector experiment

Take the State of JavaScript survey