Subscripts/Superscripts not displaying correctly

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For example, x squared would simply be displayed as x2
Unicode superscript characters:
⁰¹²³⁴⁵⁶⁷⁸⁹
Unicode subscript characters:
₀₁₂₃₄₅₆₇₈₉

https://en.wikipedia.org/wiki/Superscripts_and_Subscripts
https://www.fileformat.info/info/unicode/block/superscripts_and_subscripts/list.htm

(harder) could check to see if subscript/superscript character exists in Unicode, rather than manually checking for certain ones. This would allow characters like +⁺₊ to be added without manually filtering, useful for recursive relations or indices problems. Kings Maths School website seems to use <sup> and <sub> currently.

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#3