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SUB - Subscript

Syntax <SUB>...</SUB>
Attribute Specifications
Contents Inline elements
Contained in Inline elements, block-level elements

The SUB element is used for subscripts. Since SUB is inherently presentational, it should not be relied upon 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. For example:

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