I’ll keep that in mind ;D
HTML parsing
My first thought was to just use the DOMParser class with a call to js.new, but I ended up implementing it in 100% Lua just to see how much more work that would be.
Looking at the code now, I feel like the effort isn’t immensly higher than using native DOM parsing (though that probably depends on the application), but having a lua api available would certainly improve parsing stability & scalability a lot 
Edit: just realized, that using browser-native apis with js.new is not really possible (please correct me if I’m wrong), but using something like dom-parser with js.import would probably work as well.