[tempodox]

Yes, we write web browsers in JS, simply because our browsers let us write nested browsers in JS. I'm only waiting for an OS written in JS so we can use its editor to write an OS in JS.

[marxidad]

Gary Bernhardt mentions an OS written in JS in his video: https://www.destroyallsoftware.com/talks/the-birth-and-death...

[dcposch]

http://bellard.org/jslinux/

also

http://www.windows93.net