<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.
Content model
(Text | <cite> | <include> | <keyword> | <ph> | <q> | <term> | <text> | <tm> | <xref> | <data> | <draft-comment> | <foreign> | <required-cleanup>)*
Not contained by any element.
Not contained by any element.
Inheritance
+ topic/ph hi-d/sub
The <sub> element is specialized from <ph>. It is defined in the hi-domain module.
Attributes
The following attributes are
available on this element: universal
attributes and @keyref.
The following attributes are available on this element: universal attributes and the attributes defined below.
@keyref- Specifies a key name that acts as a redirectable reference based on a key definition within a map. See The keyref attribute for information on using this attribute.
Example
This section is non-normative.
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>