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Does there exist a utf8 code for x(4), functional for cross browser/os.
According to http://en.wikipedia.org/wiki/Unicode_subscripts_and_superscripts
^4 should be at U+2074 but can’t get it to work (on xp).
Works for me, but your mileage may vary by font. http://www.fileformat.info/info/unicode/char/2074/browsertest.htm
If you want reliable cross-browser rendering of more complex maths, you’ll need to use mathjax