what is subscripted text and superscripted text?

Answer 1

A subscript or superscript is a character (number, letter or symbol) that is (respectively) set slightly below or above the normal line of type. It is usually smaller than the rest of thetext. Subscripts appear at or below the baseline, while superscripts are above.

Answer 2

Read this :

https://code.sololearn.com/WwQJH0S1kx0o/?ref=app

for more details :

https://www.geeksforgeeks.org/html-subscript-superscript-tags/