This is not the official ECMAScript Language Specification. The most recent final ECMAScript standard is Edition 5.1, the PDF document located at http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf. This is a draft of the next edition of the standard. This page is based on the current working draft published at http://wiki.ecmascript.org/doku.php?id=harmony:specification_draf