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2.1.1 [ECMA-262/5] Section 7.6, Identifier Names and Identifiers


The specification states:

 ECMAScript implementations may recognise identifier characters defined in later editions of the Unicode Standard. If portability is a concern, programmers should only employ identifier characters defined in Unicode 3.0.

IE9 Mode, IE10 Mode, and IE11 Mode (All Versions)

Unicode 2.1 is supported. Later Unicode standards are not supported.

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