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 the term (or 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” (or speaker) part of a talker-discourse (speaker-quote) pair in a conversation.