| 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:
Chemical formulas include
H<sub>2</sub>O (water) and
C<sub>21</sub>H<sub>27</sub>NO
(methadone).Let <var>x</var> =
<var>x<sub>1</sub></var> +
<var>x<sub>2</sub></var> + ... +
<var>x<sub>n</sub></var>.
XHTML 1.0 Reference ~ Elements by Function ~ Elements Alphabetically
This document is a modification of Liam Quinn's HTML 4.0 Reference to describe XHTML 1.0. The modifications were done by Greg Baker. Copyright © 1998-2004 by Liam Quinn. This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at http://www.opencontent.org/openpub/).