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In the html <sup> tag is used to identify superscript text. In the superscript is frequently used for mathematical expression and it appears from sentence half a character above from baseline. Mostly <sup> tag we will use footnote like this Claim A[nb 1].
In the html <sub> tag attributes are classname,id, language_code, style_definition and xml:lang language_code.
In the above example <sup> tag has been added to Claim A[nb 1]. Claim A[nb 1] is a footnote.