[gavinray]

This is really similar to Quokka, which is a fantastic tool and worth every penny.

If you can build something portable, charge money for it IMO. I currently pay $50/year for this:

https://quokkajs.com/

[hollowayaegis]

Quokka looks interesting. An extension is definitely a possibility and if so it would support DOM, Vue, NodeJS, Electron, etc — not just run things in a separate NodeJS instance.

The other route I am considering is integrating backend, hosting, and a market — so the site becomes a vertically integrated code creation place.