ActionScript 3 Language Specification 
ActionScript 3 Language Specification |
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| ActionScript 3.0 Language Specification > 2 Design perspective > 2.1 Compatibility with existing programs | |||
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ECMAScript was originally designed for and used by consumers of host object models. Because ECMAScript is one of the most widely used programming languages, it is important that existing ECMAScript-compliant programs continue to work in systems that are updated to support the new definition of the language.
Therefore, programs written for ECMA-262 edition 3, compact profile, or ECMAScript for XML (ECMA-357 edition 2, also known as E4X) must continue to behave the same way in both ActionScript 3.0 and ECMA-262 edition 4.
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Current page: http://livedocs.adobe.com/specs/actionscript/3/as3_specification13.html