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Re: Color Contrast and Transparency | WCAG 2.1

From: Janina Sajka <janina@rednote.net>
Date: Thu, 28 Jul 2016 15:53:47 -0400
To: Eric Eggert <ee@w3.org>
Cc: John Foliot <john.foliot@deque.com>, WCAG <w3c-wai-gl@w3.org>, W3C WAI Accessible Platform Architectures <public-apa@w3.org>
Message-ID: <20160728195347.GA21788@opera.rednote.net>
FYI, APA currently has an open CfC on a draft comment requesting an
Accessibility Impact section in the CSS spec. The request is, with some
wording tweaks, essentially the same as at:

http://lists.w3.org/Archives/Public/public-apa/2016Jul/0040.html

If the above is incorrect, it would be helpful to know that before next
Wednesday 3 August.

Janina


Eric Eggert writes:
> On 28 Jul 2016, at 19:12, John Foliot wrote:
> 
> > Hi.
> > 
> > A question/comment for the Working Group: have we contemplated changes
> > (in
> > any of SC, Understanding or Techniques) that addresses the impact of
> > Alpha
> > Transparency of colors and the impact on color contrast and
> > accessibility?
> > Has any of the 3 current Task Forces covered this in any fashion?
> > 
> > As part of an Action Item[\*] I have at the APA, I have been asked to
> > reach
> > out to WCAG WG as there is a recognized need for techniques to measure
> > color contrast with alpha layer related to
> > https://www.w3.org/tr/css-color-4/ css color module level 4
> 
> Just skimmed the document and found this contrast CSS function which has a
> related luminance computation – this might be interesting to see how that
> works with the WCAG 2.0 definition. I think alpha transparency would be
> really good to cover in 2.1…
> 
> http://www.w3.org/TR/css-color-4/#contrast-adjuster
> 
> > 
> > If none of the TF's have looked at this to date, Andrew & Josh can we
> > get
> > this logged as an action item for the WCAG WG? As well, if we have any
> > questions or concerns around any of this, we (APA) already have some
> > time
> > blocked out at TPAC with the CSS WG, and that would be the time to bring
> > forward those issues. Hoping to flesh this out between this week and
> > September.
> > 
> > Cheers!
> > 
> > JF
> > 
> > [\* https://www.w3.org/WAI/APA/track/actions/2066 - link may not be open
> > to
> > all to see, but the gist of the issue is covered in this email.]
> > 
> > -- 
> > John Foliot
> > Principal Accessibility Strategist
> > Deque Systems Inc.
> > john.foliot@deque.com
> > 
> > Advancing the mission of digital accessibility and inclusion
> 
> 
> 
> 
> --
> 
> Eric Eggert
> Web Accessibility Specialist
> Web Accessibility Initiative (WAI) at World Wide Web Consortium (W3C)
> 

-- 

Janina Sajka,	Phone:	+1.443.300.2200
			sip:janina@asterisk.rednote.net
		Email:	janina@rednote.net

Linux Foundation Fellow
Executive Chair, Accessibility Workgroup:	http://a11y.org

The World Wide Web Consortium (W3C), Web Accessibility Initiative (WAI)
Chair, Accessible Platform Architectures	http://www.w3.org/wai/apa
Received on Thursday, 28 July 2016 19:54:12 UTC

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