CSflim

I'm don't know the answer to your question, but you can use the SUP and SUB html tags for superscript and subscript. i.e.
X[sup]y[/sup] gives: X^y

when you replace the [] with <>
and

X[sub]n[/sub] gives: X_n

you can even nest the tags if necessary:
X_n^y_i²

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