- From: Eric Eggert <ee@w3.org>
- Date: Thu, 28 Jul 2016 21:07:10 +0200
- To: "John Foliot" <john.foliot@deque.com>
- Cc: WCAG <w3c-wai-gl@w3.org>, "W3C WAI Accessible Platform Architectures" <public-apa@w3.org>
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)
Received on Thursday, 28 July 2016 19:07:24 UTC