HTML5 Tutorial#25 for Beginners -SUB & SUB Elementsbr br br In this video elements we are going to discuss to SUB and SUP br br now, SUP stands for Super while SUB stands for SUBSCRIPT.br br br SUP tag defines superscript text. Superscript text appears half a character above the normal line.br br SUP 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.