I just made it for fun. If anyone finds this useful, that's awesome ;)
very nice! works. but with my font/zoom settings there is something weird going on with text cursor when it's on the right side of text. (windows 10 -> display setting "make text bigger": 160%, chromium 92 -> page zoom: 67%)
try this new version: https://doongjohn.github.io/nim-playground
you can now create tabs!
currently I can't test windows display setting so that bug may still exists... :(
Wow! I wanted to suggest to give access to command line. It seems that with new tabs + config.nims it is already enough access to make "defines" and other configurations. :-) nice job!
ps: looks like that zoom bug is no more.