ECMASCRIPT Language Specification, Fifth Edition in HTML Format.


This site provides an online HTML version of the latest ECMASCRIPT language specification. The official specification is defined by the PDF Document located at:

This HTML version of the ELS5 standard is released under the same terms as the official specification.

Ecma Standards and Technical Reports are made available to all interested persons or organizations, free of charge and copyright, in printed form, and as files in Acrobat ® PDF format. See

Site Options

The complete document can be viewed, and linked, online at ELS5 Complete.

Individual sections (faster loading) can be viewed, and linked, online at ELS5 Sections.

Corrections and errata are available at ELS5_Errata_7-1-10.htm.

Information about linking, downloads, printing, and compatibility is available at ELS5 Info.

Author, webmaster: Richard MallonéeJune, 2015