What is difference between subscripted text and superscripted text

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Subscript: For adding a subscript text in a html file, tag can be used. The sub tag defines subscript text. Subscript text appears half a character below the normal line, and is sometimes rendered in a smaller font. Subscript text can be used for chemical formulas, like H2O to be written as H2O.
The tag used for subscript in HTML is <sub>.
Superscript: For adding a superscript text in a html file, tag can be used. The sup tag defines superscript text. Superscript text appears half a character above the normal line, and is sometimes rendered in a smaller font. Superscript text can be used for footnotes.
The tag used for superscript in HTML is <sup>.
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