Happy New Year!
This is what I've been hacking upon for the past few days:
Check it out live at: http://javerge.com
Currently it runs verge 3 maps. As you can see it's an extreme work in progress with basic map rendering and animations... but this is more than most html5 "game engines" I've yet seen :)
I'm not presently working on a full v3 import path, but if interest is high enough, I'll put that on the roadmap.
It's MIT licensed and available at https://github.com/mcgrue/js-verge
if you want to contribute/fork/take.