This document is a draft, and is designed to show changes from a previous version. It is presently showing added text,changed text,deleted text,[start]/[end] markers,and Issue Numbers.
Changes are displayed as follows:
HTML and XHTML documents that include images that cannot be described in a short text alternative.
This technique relates to:
Some older assistive technologies do not support the longdesc
attribute.
The objective of this technique is to provide information in a file designated by the
longdesc
attribute when a short text alternative does not adequately convey the function
or information provided in the image. The longdesc
attribute is a URI, the target of
which contains a long description of the non-text content.
Example Code:
<p><img src="chart.gif" alt="a complex chart" longdesc="chartdesc.html"/></p>
Resources are for information purposes only, no endorsement implied.
Check that the img
element has a longdesc attribute.
Check that the value of the longdesc
attribute is a valid URI of an existing resource.
Check that the content at the target of that URI contains a long description describing the original non-text content associated with it.
#1 through #3 are all true