Definitions for "Longdesc"
A long description, created by using the longdesc attribute in HTML, is a method of providing equivalent text for non-text elements, such as images, objects, and applets. The text value for a long description is the URL where the long description is available. Because some browsers do not support the longdesc attribute, you should use both alternative text and long descriptions for Web elements that require a long description.
a hyperlink (to a page holding a longer description of an image) and a title is made up of text
a long description of an image