http://www.ecma.ch/ecma1/STAND/ECMA-262.HTM
The official ECMA-262 language specification from ECMA, the body that maintains the language upon which ActionScript is based. Netscape's JavaScript and Microsoft's Jscript are two other implementations of ECMA-262. This is a highly technical document used to create things such as a conforming ECMA interpreter.
http://developer.netscape.com/docs/manuals/js/core/jsguide/contents.htm
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