The dt element represents either a term/name or a talker/speaker.
A dt element must have a
start tag.
A
dt element's end tag may be omitted if the
dt element is immediately
followed by another dt element or
a dd element.
If a dt element’s parent is a dl element, then the dt element represents a term/name part of a term-description (name-value) grouping in a description list.
If a dt element’s parent is a dialog element, then the dt element represents a talker/speaker part of a talker-discourse (speaker-quote) pair in a conversation.