Subscript and superscript
For subscript, put <sub> before the word you want to appear in subscript, and </sub> afterwards.
This is an example of what subscript looks like.
For superscript, put <sup> before the word you want to appear in superscript (without a space), and </sup> afterwards (also without a space).
This is an example of what superscript looks like.
You should use subscript and superscript for scientific notation and measurements, like chemical names or metres squared.