Alternate text descriptions for image maps not supported.
Specifying alternate text descriptions for individual regions of image maps is not fully supported. So any interactive document that requires clicking on an image region (for example, one displaying a map and asking the user to click on their state or province) cannot be made accessible.
This is a requirement for Section 508 of the Rehabilitation Act and can be found in the standards at CFR1194.22(e and f).
(http://atrc.utoronto.ca/index.phpoption=com_content§ionid=14&task=view&hidemainmenu=1&id=371
Refer to Section 4.5.)
Implement similar functionality to <alt> attribute of the area shape tag per HTML 4.01.
http://www.w3.org/TR/html401/struct/objects.html#adef-alt
Refer to 13.8 How to specify alternate text.
Part 4
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Proposed Disposition of DIS 29500 Comment US-0024 (Modified: 2008-01-03) DIS 29500 does not include functionality to support image maps. Because of this, there should be no accessibility concerns pertaining to an image map within DrawingML. Note that any individual image can have descriptive text, as defined in Part 4, ยง5.2.2.3, page 3,891, using the descr attribute. Similar Comments: CA-0073 ,
