dd
Encloses the definition of a term that makes up part of a definition list. Used within a <dl> or definition list block. The <dd> tag’s default layout is a margin-left of 3 em, and no default text-indent. It is preceded by a <dt> or definition term tag for the term it defines.

Sample:

<dl>
 <dt>eBook</dt>
 <dd>An electronic book.</dd>
</dl>

attributes

id
Provides an element with a unique name within a single document. This is especially useful in works with extensive cross-referencing and linking, such as dictionaries, encyclopedias, or travel guides. Use of ids simplifies linking and updates.
class
Affiliates an element with one or more classes.
style
Attaches a list of inline (name:value paired) CSS properties to a specific tag, for example: style="name:value;name:value"
Note: Media types other than "text/x-oeb1-css" will be ignored with a warning in a document of type "text/x-oeb1-document".
title
This attribute is ignored.