W3C home > Mailing lists > Public > www-style@w3.org > March 2012

Re: [css3-images] [Fwd: RE: CSS Image Values and Replaced Content Module Level 3 - very brief review]

From: James Nurthen <james.nurthen@oracle.com>
Date: Wed, 14 Mar 2012 15:34:45 -0700
Message-ID: <4F611D05.1060006@oracle.com>
To: "Tab Atkins Jr." <jackalmage@gmail.com>
CC: Michael Cooper <cooper@w3.org>, CSS WG <www-style@w3.org>, WAI PFWG <w3c-wai-pf@w3.org>, WAI XTech <wai-xtech@w3.org>, WAI Liaison <wai-liaison@w3.org>
On 3/14/2012 2:31 PM, Tab Atkins Jr. wrote:
>> 4. Gradients
>>
>> It should probably be stated that gradients can cause subtle issues with
>> maintaining a sufficient luminosity contrast ratio between the text and its
>> background. (an informative note about making sure to meet WCAG2 1.4.3 is
>> probably good)
> How is this any different from the generic situation with background
> colors/images and contrast?  I haven't added anything about this.
The biggest difference between generic colors and the other scenarios 
(images / gradients / rgba colors) is the difficulty in measuring the 
ratio to determine if you have sufficient contrast. With rgb colors it 
is trivial to determine if you have sufficient contrast. With the others 
there is no automated way to measure the ratio.

regards,
James
Received on Wednesday, 14 March 2012 22:37:24 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Tuesday, 22 May 2012 03:48:51 GMT