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Standard ECMA-262
ECMAScript® Language Specification

Edition 5.1 (June 2011)

This Standard defines the ECMAScript scripting language.

The following files can be freely downloaded:

File name Size (Bytes) Content
ECMA-262.pdf 3 270 645 Acrobat (r) PDF file
ECMA-262 html   Browsable HTML

This edition 5.1 of the ECMAScript Standard is fully aligned with third edition of the international standard ISO/IEC 16262:2011.

The previous replaced "historical" editions of this Ecma Standard are available here.