The ECMA-262 standard is the official documentation for the ECMAScript language.
The Fifth Edition of ECMA-262 has been approved and is available for public download.
- Download ECMA-262, Edition 5
Edition 4 (Historical)
After completion of the Third Edition, significant work was done to develop a Fourth Edition. Although development of a Fourth Edition was not completed, that work influenced ECMAScript, Fifth Edition and is continuing to influence the ongoing development of ECMAScript.