Re: Your comments on WCAG 2.0 Last Call Working Draft of December, 2007

>  Comment 2: Why do contrast requirements not apply to lines in diagrams and
> such?
>  Source:
> http://lists.w3.org/Archives/Public/public-comments-wcag20/2008Jan/0057.html
>  (Issue ID: 2435)
>  Status: VERIFIED / NOT ACCEPTED
>
>
>  We do realize that there are cases where graphs etc. are so complex that it
> is hardly possible to ensure accessibility through appropriate colours.
>
>  But there are plenty of much simpler cases where accessibility does depend
> significantly on the choice of suitable colours.
>
>  In order to preserve testability the success criteria could be restricted
> to these simple cases that can be identified and tested unambiguously.
>
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Response from Working Group:
---------------------------------------------
The working group believes that most such simple cases are already
addressed by SC 1.4.1 Use of Color, and has not found a way to
characterize simple cases that are not covered by SC 1.4.1 but would
fail the contrast provision. We recommend this as an area for future
research.

We have a number of advisory techniques listed in 1.4.3 and 1.4.6 that
relate to improving contrast for diagrams that have not yet been
written up. If you would like to help us in drafting these, please
feel free to submit techniques using the techniques submission form
(http://www.w3.org/WAI/GL/WCAG20/TECHS-SUBMIT/).

Thanks again for the interest that you have taken in these guidelines.
Could we ask you to let us know whether or not you are satisfied with
this response by Wed, April 9?

Loretta Guarino Reid, WCAG WG Co-Chair
Gregg Vanderheiden, WCAG WG Co-Chair
Michael Cooper, WCAG WG Staff Contact

On behalf of the WCAG Working Group