ActionScript 3.0 is compliant with the ECMAScript Edition 3 (ECMA-262) standard and is based on the ECMAScript Edition 4 (ES4) draft language specification. ActionScript 3.0 advances the language to offer developers a robust programming model for rich internet applications. Features that developers should be aware of include:ĪctionScript is the powerful object-oriented programming language of the Flash Player runtime environment. ActionScript 3.0 resources and documentation are also available in the ActionScript Technology Center. The features available in Flash Player 9 are described in the Flex Builder 2 help.