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Ext JS is a JavaScript framework for building Rich Internet Applications (RIAs) that run in web browsers.

Ext JS provides a complete object oriented framework for creating a desktop-like application that runs in a web browser. It manages object lifecycle, layouts, theming and a large library of UI widgets including charting.

Originally built as an add-on library for YUI, it has a modular architecture that developers can extend using JavaScript. Ext JS is now in version 4.1

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