
Here is some overview from Ext Core
Ext Core provides cross-browser abstractions for:
* DOM manipulation and traversal
* CSS management
* Event handling
* Dimensions and Sizing
* AJAX and JSON Support
* AnimationsIn addition to providing cross-browser abstractions for the DOM, Ext Core also includes some of the most used and popular utilities from Ext JS.
* Classical Inheritance Class System
* Observable Class
* Markup generation and Templating
* Timed code execution
* URL encoding and decoding
Source : http://extjs.com/blog/2009/04/04/ext-core-30-beta-released/
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