- It is a framework.

- 100% client side implementation.

- It is used as a standardization of Java side implementation on client side.

- JS DOM and XML DOM are incorporated in EXT JS

- It is a part of Yahoo toolkit.

- It is used by other technologies apart from JAVA.

- ITs a widget which has its own lifetime so we can call but we can't control over the lifetime.

- It's a hierarchical if you hold the root tag you can traverse all the elements within it using getByElementId

- EXT.get('myElementId')

- 2 methods

- class method prefix the calling object with '.'

- Object method prefix the calling object with '#'

- Flyweight Design Pattern is a pattern which traverse the root object and collect all the wastes.

- SPECIFIC FLYWEIGHT when it is used for a single object.

- GLOBAL FLYWEIGHT when it is used for a multiple object.

- It reconstructs old object when it is required.

- 58 widgets are builtin out of which 36 are UI widgets.

- EXT.onReady is an eventhandler which is used to start the hierarchy of DOM structure.

- Node is a super object.