Re: Color Contrast and Transparency | WCAG 2.1

I've used the colour contrast analyzer to measure contrast of text sitting
on a transparent background but I choose the sample that had the lowest
contrast as my test point.

Cheers,
David MacDonald



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On Thu, Jul 28, 2016 at 3:53 PM, Janina Sajka <janina@rednote.net> wrote:

> 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
>
>
>
>