css-select turns CSS selectors into functions that tests if elements match
them. When searching for elements, testing is executed "from the top", similar
to how browsers execute CSS selectors.

In its default configuration, css-select queries the DOM structure of the
domhandler module (also known as htmlparser2 DOM).

Features:
* Full implementation of CSS3 selectors
* Partial implementation of jQuery/Sizzle extensions
* Very high test coverage
* Pretty good performance