Subscript

A subscript is text that is printed below the line. It is frequently used in chemical and mathematical formulas.

Syntax

XDITA

<sub>

HDITA

<sub>

MDITA (extended profile)

There is no specific support in the MDITA core profile. If needed, use an HDITA snippet.

Rendering expectations

The subscript component is typically rendered lower in relationship to the surrounding text and in a smaller font.

Attributes

The available attributes vary based on the authoring format:

XDITA and HDITA
The following attributes are available on this element: localization attributes, universal attributes, and @keyref.
MDITA
For the MDITA core profile, the equivalent of the XDITA @keyref attribute is supported. For the MDITA extended profile, attributes can be specified by using the HDITA representation.

Examples

Figure 1. XDITA example

The following example demonstrates the use of a subscript in an XDITA topic.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE topic PUBLIC "-//OASIS//DTD LIGHTWEIGHT DITA Topic//EN" "lw-topic.dtd">
<topic id="food-additives">
  <title>Food Additives for pH Control</title>
  <body>
    <p>In very rare occasions, our Sensei Sushi kitchen lab technicians can use Sulfuric Acid, FCC (H<sub>2</sub>SO<sub>4</sub>) to control pH during processing. Ask your supervisor for more information.</p>
  </body>
</topic>
Figure 2. HDITA example

The following example demonstrates the use of a subscript n in an HDITA topic.

  <!DOCTYPE html>
  <html>
  <head>
  <title>Food Additives for pH Control</title>
  </head>
  <body>
   <article id="food-additives">
    <h1>Food Additives for pH Control</h1>
    <p>In very rare occasions, our Sensei Sushi kitchen lab technicians can use Sulfuric Acid, FCC (H<sub>2</sub>SO<sub>4</sub>) to control pH during processing. Ask your supervisor for more information.</p>
  </article>
  </body>
  </html>