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RE: changing presentation of links

From: Jonathan Avila <jon.avila@ssbbartgroup.com>
Date: Fri, 22 Mar 2013 19:07:34 -0400
Message-ID: <af1574fa1d0f972385e2c75b2253c30c@mail.gmail.com>
To: Gregg Vanderheiden <gv@trace.wisc.edu>, Alastair Campbell <alastc@gmail.com>
Cc: W3C WAI ig <w3c-wai-ig@w3.org>
[Greg wrote] .  It has to *also* be distinguishable *before* you point at it

And by that do you mean there is a differentiation in color which makes it
distinguishable?  G183 seems to say you are good if there is a non-color
differentiation on focus and on hover.  This certainly raises an
interesting point  its not the use of any particular color that conveys
meaning here but the difference in color.

I would argue the best test for something like this is not grayscale but
purely black and white because it would require evidence of other visual
changes other than just color difference.  A grayscale check would
potentially pass color differentiation but black and white would not.


*From:* Gregg Vanderheiden [mailto:gv@trace.wisc.edu]
*Sent:* Friday, March 22, 2013 6:55 PM
*To:* Alastair Campbell
*Cc:* W3C WAI ig
*Subject:* Re: changing presentation of links

this issue was just raised in public comment.   If you don't see the reply
there -- you will see the reply shortly.

PS - G183 says more than that.  It has to *also* be distinguishable
*before*you point at it -- the pointing only makes it
*more* distinguishable.

so the failure and the G183 are not in conflict



Gregg Vanderheiden Ph.D.
Director Trace R&D Center
Professor Industrial & Systems Engineering
and Biomedical Engineering University of Wisconsin-Madison

Technical Director - Cloud4all Project - http://Cloud4all.info
Co-Director, Raising the Floor - International - http://Raisingthefloor.org
and the Global Public Inclusive Infrastructure Project -  http://GPII.net

On Mar 22, 2013, at 12:42 PM, Alastair Campbell <alastc@gmail.com> wrote:

Hi everyone,

Sorry to jump on an old thread, but I'm back in the accessibility
universe now, and this came up today.

Specifically on link colour and distinguishing links from general
text, there's a conflict in the success & fail criteria for 1.4.1.

The test from G183 [1] specifically says that changing the link on
mouseover/focus to include an underline or other mechanism is ok,
whereas F73 [2] says that is not sufficient.

>From the previous discussion, it sounds like G183 should be

deprecated, as if we are talking about "people who cannot perceive
color differences" then the contrast aspect is irrelevant.


1] http://www.w3.org/TR/2012/NOTE-WCAG20-TECHS-20120103/G183
2] http://www.w3.org/TR/2012/NOTE-WCAG20-TECHS-20120103/F73
Received on Friday, 22 March 2013 23:09:47 UTC

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