Hey there, creator of instacss here. Thanks for all the feedback! I posted this as a Show HN last week, but it's nice to see that someone has re-discovered it: http://news.ycombinator.com/item?id=3222253 . Since then I've added a few features, one of which being the ability to have permalinks so that you could use it as a google chrome search. This is why I push to the url bar as you type. I'm really open to feedback…
Would be nice if you share some of the used backend technology
Data is scraped mostly from MDN using node-scraper and then thrown into mongodb for storage.
Backend is also node and just provides a json endpoint for pulling the entire db client-side (along with serving up index.html and all the client-side js).
Frontend is all backbonejs, which makes writing the search function pretty insanely simple: https://github.com/rgarcia/instacss/blob/master/static/js/vi...
Both backend and frontend code is organized using requirejs, which I am pretty much in love with.