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Re: Color Contrast/G148

From: Christophe Strobbe <christophe.strobbe@esat.kuleuven.be>
Date: Fri, 07 Aug 2009 10:50:12 +0200
Message-Id: <>
To: w3c-wai-ig@w3.org
Hi William,

At 10:03 7/08/2009, W Reagan wrote:
>Is the intent of this 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
Kasteelpark Arenberg 10 bus 2442
B-3001 Leuven-Heverlee
tel: +32 16 32 85 51
"Better products and services through end-user empowerment" 
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"social networks". You may have agreed to their "privacy policy", but 
I haven't.
Received on Friday, 7 August 2009 08:51:02 UTC

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