A sizzlin' hot selector engine.
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README
sizzle.js

README

This is a new selector engine that I'm working on.

---- It's a work in progress! Not ready for use yet! ----

It's definitely not ready yet (got some minor outlier bugs in the standards-compliant browsers - and a bunch of major bugs in IE still left to tackle) but the results are already promising.

4x faster in Firefox 3, 3x faster in Opera 9, 1.5x faster in Safari 3 than the other major JavaScript libraries. It's completely standalone (no library dependencies) and clocks in at under 4kb.

I'm just committing my code before moving on to work on IE - so beware. And yes, I expect this engine to become the new default selector engine in jQuery.