[PeterStuer]

While not browser based, Thonny is designed speciffically for education https://thonny.org .

For beginners the main advantage is the easy install and maintainance, and the less intimidating/cluttered environment. I've seen it used successfully in remote teaching classes for absolute beginners working on their own machines.

IMHO it makes some decent tradeoffs, and it is an onramp for students evolving to VSCode or PyCharm when they feel ready.