[netdur]

I have very good experience writing UIs in HTML's canvas, look at my repos

https://github.com/netdur?tab=repositories

I say porting Flutter to web using canvas (both have similar APIs) is very bad idea.

this repo closes the gap in sane way https://github.com/yjbanov/butterfly

[unkown-unknowns]

I don't understand what you mean. Please explain.