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Ext JS is the most comprehensive JavaScript framework for building data-intensive, cross-platform web and mobile applications for any device. Ext JS supports all the modern browsers, including Chrome, Firefox, Safari, IE, IE and Microsoft Edge. Ext JS has preintegrated and -tested high-performance UI components such as HTML5 calendar, grids, lists, trees, forms, menus, toolbars, panels, and windows. Ext J has tools for building robust applications. ExtJS has the necessary tools provided by Sencha.