Peppy is a lightning fast CSS 3 compliant selector engine with no external library dependencies. Peppy can be used along side other libraries seamlessly.
As it stands now Peppy is faster1 than all other major JavaScript libraries with DOM querying capabilities (Prototype 1.6.0.3, JQuery 1.2.6, MooTools 1.2.1, EXT 2.2, DoJo 1.2.0, YUI 2.6.0). It is faster2 than Sizzle by John Resig and it also is cross browser (IE included). Take a look for yourselves, I have a profiling page set up here.
At 10k it is an ideal replacement for other excellent but bulkier libraries (whose feature sets span beyond DOM querying) when features additional to DOM querying are not needed in your web application. If you are designing your own JavaScript library or want to replace your existing libraries selector engine then Peppy is an ideal candidate.
http://jamesdonaghue.com
Sizzle
This is a new pure-JavaScript CSS selector engine that I'm working on. Comes in at roughly 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 4KB.
Currently this engine is expected to become the new default selector engine of jQuery, MochiKit, Prototype, and Dojo.
http://github.com/jeresig/sizzle/tree/master
Prototype
Prototype is a JavaScript Framework that aims to ease development of dynamic web applications.
Featuring a unique, easy-to-use toolkit for class-driven development and the nicest Ajax library around, Prototype is quickly becoming the codebase of choice for web application developers everywhere.
http://www.prototypejs.org/
jQuery
jQuery is a fast and concise JavaScript Library that simplifies HTML document traversing, event handling, animating, and Ajax interactions for rapid web development. jQuery is designed to change the way that you write JavaScript.
http://jquery.com/
MooTools
MooTools is a compact, modular, Object-Oriented JavaScript framework designed for the intermediate to advanced JavaScript developer. It allows you to write powerful, flexible, and cross-browser code with its elegant, well documented, and coherent API.
MooTools code respects strict standards and doesn't throw any warnings. It's extensively documented and has meaningful variable names: a joy to browse and a snap to understand.
http://mootools.net
Ext JS
Ext JS is a cross-browser JavaScript library for building rich internet applications.
- High performance, customizable UI widgets
- Well designed, documented and extensible Component model
- Commercial and Open Source licenses available
dojo
Ajax, events, packaging, CSS-based querying, animations, JSON, language utilities, and a lot more. All at 26K (gzipped).
http://dojotoolkit.org
The Yahoo! User Interface Library
The Yahoo! User Interface (YUI) Library is a set of utilities and controls, written in JavaScript, for building richly interactive web applications using techniques such as DOM scripting, DHTML and AJAX. The YUI Library also includes several core CSS resources.
http://developer.yahoo.com/yui/
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