Node type: Element (may contain text and/or other elements)
Whitespace: Not protected
Marks text that should be rendered in subscript format.
{textual content}
<para paraID="4">Superscript: e=mc<sup>2</sup>. Subscript: H<sub>2</sub>O.</para>
Superscript: e=mc2. Subscript: H2O.
Use the sub character style. To embed <sub> in another character style, apply the subscript character attribute directly.