ECMAScript® Language Specification
Edition 5.1 (June 2011)
This Standard defines the ECMAScript scripting language.
The following file can be freely downloaded:
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This edition 5.1 of the ECMAScript Standard is fully aligned with third edition of the international standard ISO/IEC 16262:2011.
This ECMAScript Language Specification is also available in HTML file format here.
The previous replaced "historical" editions of this Ecma Standard are available here.