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    <p>The spec details are <a href="https://www.ecma-international.org/publications/files/ECMA-ST-ARCH/ECMA-334%201st%20edition%20December%202001.pdf" rel="nofollow noreferrer">here</a>. Essentially, any unicode character (including unicode escapes) in the <a href="http://msdn.microsoft.com/en-us/library/20bw873z.aspx" rel="nofollow noreferrer">character classes</a> <a href="http://www.fileformat.info/info/unicode/category/Lu/list.htm" rel="nofollow noreferrer">Lu</a>, <a href="http://www.fileformat.info/info/unicode/category/Ll/list.htm" rel="nofollow noreferrer">Ll</a>, <a href="http://www.fileformat.info/info/unicode/category/Lt/list.htm" rel="nofollow noreferrer">Lt</a>, <a href="http://www.fileformat.info/info/unicode/category/Lm/list.htm" rel="nofollow noreferrer">Lm</a>, <a href="http://www.fileformat.info/info/unicode/category/Lo/list.htm" rel="nofollow noreferrer">Lo</a>, <a href="http://www.fileformat.info/info/unicode/category/Nl/list.htm" rel="nofollow noreferrer">Nl</a>, <a href="http://www.fileformat.info/info/unicode/category/Mn/list.htm" rel="nofollow noreferrer">Mn</a>, <a href="http://www.fileformat.info/info/unicode/category/Mc/list.htm" rel="nofollow noreferrer">Mc</a>, <a href="http://www.fileformat.info/info/unicode/category/Nd/list.htm" rel="nofollow noreferrer">Nd</a>, <a href="http://www.fileformat.info/info/unicode/category/Pc/list.htm" rel="nofollow noreferrer">Pc</a>, and <a href="http://www.fileformat.info/info/unicode/category/Cf/list.htm" rel="nofollow noreferrer">Cf</a>. The first character is an exception and it must be a letter (classes <a href="http://www.fileformat.info/info/unicode/category/Lu/list.htm" rel="nofollow noreferrer">Lu</a>, <a href="http://www.fileformat.info/info/unicode/category/Ll/list.htm" rel="nofollow noreferrer">Ll</a>, <a href="http://www.fileformat.info/info/unicode/category/Lt/list.htm" rel="nofollow noreferrer">Lt</a>, <a href="http://www.fileformat.info/info/unicode/category/Lm/list.htm" rel="nofollow noreferrer">Lm</a>, or <a href="http://www.fileformat.info/info/unicode/category/Lo/list.htm" rel="nofollow noreferrer">Lo</a>) or an underscore. Also, if the identifier is a keyword, you must stick an @ in front of it. The @ is optional otherwise.</p>
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      1. This table or related slice is empty.
 

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