<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>
|
<strong>
|
<em>
|
<b>
|
<i>
|
<line-through>
|
<overline>
|
<sup>
|
<sub>
|
<tt>
|
<u>
|
<q>
|
<term>
|
<text>
|
<tm>
|
<xref>
|
<data>
|
<sort-as>
|
<draft-comment>
|
<foreign>
|
<required-cleanup>
)*
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.
For HDITA, the equivalent of
@keyrefis@data-keyref
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>