A pure-JavaScript CSS selector engine designed to be easily dropped in to a host library. Started by the jQuery team but available as a library for all javascript engines and other apps. The project and code are now owned by the Dojo Foundation.
Features:
Completely standalone (no library dependencies)
Competitive performance for most frequently used selectors
Only 3KB minified and gzipped
Highly extensible with easy-to-use API
Designed for optimal performance with event delegation
Clear IP assignent (all code held by the Dojo Foundation, contributors sign CLAs)