alt
alt — A text-only annotation, often used for accessibility.
![[-]](figs/web/nav/down.gif)
Description
The alt element was originally added to DocBook to
provide an alternative, usually text, presentation for graphical
elements. In DocBook V5.0, it was made a “ubiquitous” element so that
it's available almost everywhere. The semantic intent of
alt is simply that it provides alternative text, often for
accessibility.
Processing expectations
May be formatted inline or as a displayed block, depending on context. It is not usually rendered where it occurs, rather it is used to annotate some other aspect of the presentation.
For example, in an HTML presentation, the alt for a
media object would likely provide the text of the
alt attribute for the HTML
img element.
In the context of an acronym, the alt could
provide the title attribute for the HTML
abbr element allowing
the expansion to be presented appropriately to the user (as a “tooltip”,
for example, or read aloud).
Parents ![[+]](figs/web/nav/right.gif)
Children
The following elements occur in alt: text, inlinemediaobject.