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In the html <sub> tag is used to identify subscript text. In the subscripts is frequently used for mathematical expressions and it appears from sentence half a character below baseline and it mostly we will use chemical formulas like this CH2O.
In the html <sub> tag attributes are classname,id, language_code, style_definition and xml:lang language_code.
In the above example <sub> tag has been added to CH2O. it is a chemical formulas.