Any volunteers for making an operating system kernel? Or has that been done already?
Well, there's a PC emulator, http://bellard.org/jslinux/tech.html
It's using emscripten, not handwritten JS, though.
It was really impressive to see UE4 running at ~7 fps on an old ThinkPad (without discrete GPU) in pure software.
It looks like the demo lived at the time at https://www.unrealengine.com/html5 - and the site doesn't seem to work through Wayback Machine.
bbl
[1] https://github.com/creationix/js-git
[2] https://www.kickstarter.com/projects/creationix/js-git
[3] https://www.bountysource.com/teams/js-git/fundraiser
Well, there's a PC emulator, http://bellard.org/jslinux/tech.html