That is very cool. Has anyone made a nice beginner's learning environment out of it? Seems like it would solve some of the extra friction that makes it hard to get started.

I played around with it to build a little "intro to python" walkthrough on my blog a while back. It worked surprisingly well! I had a little trouble giving users the ability to ctrl-c if they accidentally wrote an infinite loop though lol (piodide supports it I just didn't implement it): https://cfu288.com/blog/2024-05_cwc-intro-to-python/

Jupyterlite - a lot of jupyter trial versions use it.