Description Tags
When an alt tag is not enough.
Description tags,
[D], are a method of describing a complex graphic. When the text description
is too long or complicated to go into an alt tag, a "D Tag"
is used.
The [D] or "Description Tag" is actually a link to a text description
of the graphic in question. This tag generally appears right after the
graphic.
Example
[D]
The code for the D tag would look like this
<a href="description.html" title="Colleen and family members">[D]</a>