There are many schools of thought around using IDs vs Classes, some of the old was that "ID's are faster to parse", but really, its an old habit for many to use

There are many schools of thought around using IDs vs Classes, some of the old was that "ID's are faster to parse", but really, its an old habit for many to use IDs. I think the answer is always "it depends", but I'm somewhat using classes and aria roles over IDs now anyway. The "jquery functionality" you speak of is a query engine, but web kit based browsers have "querySelectorAll", which is native C code. jquery uses it (where available)… but being that we were trying to build something that downloaded very quickly on spotty 3g connections, we chose to write a couple of utility functions. (The total byte count for application.min.js is 3186).