Sizzle : Sizzle is a pure-JavaScript CSS selector engine designed to be easily dropped in to a host library.
Sizzle

Overview
Sizzle is a pure-JavaScript CSS selector engine designed to be easily dropped in to a host library.

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Features

  • Completely standalone (no library dependencies)
  • Competitive performance for most frequently used selectors
  • Only 4KB minified and gzipped
  • Highly extensible with easy-to-use API
  • Designed for optimal performance with event delegation
  • Clear IP assignment (all code held by the Dojo Foundation, contributors sign CLAs)