<sub>
A subscript is text that is printed below the line. It is frequently used in chemical and mathematical formulas.
Rendering expectations
The content of the <sub>
element is typically rendered lower in relationship to the
surrounding text and in a smaller font.
Specialization hierarchy
The <sub> element is
specialized from <ph>. It is defined in the
highlighting-domain module.
Attributes
The following attributes are
available on this element: universal
attributes and @keyref.
Example
The following code sample shows how the <sub> element is used
in a chemical
formula:
<note>When cleaning, be sure to dilute the baking soda (NaHCO<sub>3</sub>) with water
(H<sub>2</sub>O) before mixing in the vinegar (CH<sub>3</sub>COOH).</note>