Chemical expression, reaction, equation, etc. that is set apart within the text.
Any combination of:
Text, numbers, or special characters
<alt-text> Alternate Text Name (for a figure, etc.)
<long-desc> Long Description
<email> Email Address
<ext-link> External Link
<uri> Uniform Resource Identifier (URI)
<break> Line Break
<bold> Bold
<italic> Italic
<monospace> Monospace Text (Typewriter Text)
<overline> Overline
<roman> Roman
<sans-serif> Sans Serif
<sc> Small Caps
<strike> Strike Through
<underline> Underline
<object-id> Object Identifier
<def-list> Definition List
<list> List
<graphic> Graphic
<media> Media Object
<preformat> Preformatted Text
<fn> Footnote
<target> Target of an Internal Link
<xref> X (cross) Reference
<sub> Subscript
<sup> Superscript