I typically just write some DOM based JS for those situations. Web APIs do a lot more than we think these days. Write some data structures to drive them, maybe

I typically just write some DOM based JS for those situations. Web APIs do a lot more than we think these days. Write some data structures to drive them, maybe call Object.freeze if you want, perhaps use Immutable.js because it’s setter/getter functions are kind of nice, but really, I’ve not found a pressing need for many libraries for these “in between” sites myself.