Thread Subject: Color
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From: Gregg Vanderheiden
Date: Tue, Aug 14 2007 9:25 AM
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Current TEITAC proposal is not sufficient.
"Color must not be used as the only means of conveying information,
indicating an action, prompting a response, or distinguishing a visual
element."
1) Markup could be used to meet this requirement and is of no value to
people who are color blind - and they are the target of this provision.
(The Non-text content provision and presentation provision already cover
this for people who are blind.)
2) For products where AT is not used or usable, a new provision or
subprovision would be needed.
Suggest using WCAG language.
Any information that is conveyed by color differences is also simultaneously
visually evident without the color differences.
Or perhaps
"Color must not be used as the only VISUAL means of conveying information,
indicating an action, prompting a response, or distinguishing a visual
element."
Gregg
------------------------
Gregg C Vanderheiden Ph.D.
Professor - Depts of Ind. Engr. & BioMed Engr.
Director - Trace R & D Center
University of Wisconsin-Madison
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