Sub

The HTML   element is used for subscripts. Since it is inherently presentational, it should not be used to express a given meaning. However, it can be useful for chemical formulas and mathematical indices, where the subscript presentation is helpful but not required. This element must not be used for styling purposes like the styling of the product name LaTeX. In that case CSS styles should be used; the  property with the   value will achieve the same effect.

Attributes
See Global HTML Attributes.

HTML example:

TEXTTEXT

Image example: