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Re: Color Contrast/G148

From: W Reagan <wreagan1@yahoo.com>
Date: Fri, 7 Aug 2009 12:39:29 -0700 (PDT)
Message-ID: <109549.95101.qm@web111606.mail.gq1.yahoo.com>
To: w3c-wai-ig@w3.org, Christophe Strobbe <christophe.strobbe@esat.kuleuven.be>
Cc: gv@trace.wisc.edu
I only have two items that specify color. 1) Headings and 2) a horizontal line.
How can I keep my existing colors for my headings and horizontal line, and still pass G189.
For colors of white backgroud white black text, my style sheet will not parse unless I specify backgroud-color: #FFF.
Therefore, it contradicts Parsing 4.1.1. I need to pass Parsing and Color Contrast. 
I am using G189 because there is a reference to Consistent ID, which I also need to pass.
Can I kill four birds with one stone? (1) Color, (2) Parsing, (3), Consistent ID, and (4) G189?
As of now, color is set at level AA, and Parsing passes. 
What work needs to be done.
FYI: I will not document my site or give any attachment.
--- On Fri, 8/7/09, Christophe Strobbe <christophe.strobbe@esat.kuleuven.be> wrote:

From: Christophe Strobbe <christophe.strobbe@esat.kuleuven.be>
Subject: Re: Color Contrast/G148
To: w3c-wai-ig@w3.org
Date: Friday, August 7, 2009, 8:50 AM

Hi William,

At 10:03 7/08/2009, W Reagan wrote:
> Is the intent of this G148 <http://www.w3.org/TR/2008/NOTE-WCAG20-TECHS-20081211/G148>http://www.w3.org/TR/2008/NOTE-WCAG20-TECHS-20081211/G148 used to evaluate the paragraph, link color, heading color, style sheet, or all?

Using this technique, a developer does not specify any foreground or background colours. The consequence of this is that the user sees all the content in the default colours configured on his/her system (browser settings and possibly high-contrast colour scheme on his OS desktop). So you basically defer the responsibility for sufficient contrast to the user (or whoever configured their computer).

As soon as you define a foreground or background colour, you are not using technique G148, and you need to look at http://www.w3.org/TR/2008/NOTE-WCAG20-TECHS-20081211/G18.html and test each foreground-background combination (including every link state - hover, focus, active, ... - and, if applicable, different states in form controls (for example, some developers change the background colour of a control on focus)).

Best regards,


-- Christophe Strobbe
K.U.Leuven - Dept. of Electrical Engineering - SCD
Research Group on Document Architectures
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Received on Friday, 7 August 2009 19:40:11 UTC

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