##What?
CSSselect is CSS selector engine. It returns a function that tests elements if they match a selector - checking needs to happen "from the top", like browser engines execute queries.
##Why?
Just take the following CSS query: foo bar baz. When the element named baz has like a billion children, every one of them needs to be checked if they match a query. Three times, to be precise, if you run a CSS query from the start to the end (as e.g. JSDOM does). Yup, that's slow.
This library checks every element once. The more complex the query, the greater the benefit.
##How?
By stacking functions!
##TODO
- The API needs to be improved
- Documentation needs to be written