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Editorial Team
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Asked: 2026-06-09T07:17:48+00:00

Have any tests been done across many browsers/rendering engines to check they adhere to

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Have any tests been done across many browsers/rendering engines to check they adhere to the javascript spec in relation to variable names including unusual characters.

For example, if I use…

π = Math.PI
truth = "Pi should really be "+(2*π)+" and a lot of maths should be re-written"

I know the spec says it should work – but do all javascript interpreters follow perfectly the spec?

If that works in firefox, can I expect it to work in internet explorer too – on all platforms? And will it also work on Rhino, or other javascript interpreters?

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1 Answer

  1. Editorial Team

    In the first edition of ecmascript, dating back to june 1997, they are not allowed:

    Non-ASCII Unicode characters may appear only within comments and string literals

    In the third edition of ecmascript, dating back to december 1999, they are allowed:

    Non-Latin Unicode characters are allowed in identifiers, string literals, regular expression literals and comments.

    So anything that claims to implement > es3, will support them.

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