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Re: CSS background images and HCM [was: Low vision user requirements wiki page]

From: Jim Allan <jimallan@tsbvi.edu>
Date: Thu, 29 Oct 2015 20:22:02 -0500
Message-ID: <CA+=z1WknK9wkTxYs1j3RHHOirPtJ=L0F1_c8CueD27Fjm5E3ng@mail.gmail.com>
To: Laura Carlson <laura.lee.carlson@gmail.com>
Cc: Shawn Henry <shawn@w3.org>, public-low-vision-a11y-tf <public-low-vision-a11y-tf@w3.org>
+1 to #3
 author proposes user (with browser help) disposes - Al Gilman
(parenthetical are mine).
 User ought to have the option.

On Thu, Oct 29, 2015 at 6:24 AM, Laura Carlson <laura.lee.carlson@gmail.com>
wrote:

> Hi Shawn,
>
> The fundamental user issue is that CSS background images in HCM vanish
> and are not perceivable.
>
> It could potentially be solved by any of the 3.
>
> WCAG has Technique F3: Failure of Success Criterion 1.1.1 due to using
> CSS to include images that convey important information
> http://www.w3.org/TR/WCAG20-TECHS/F3.html
>
> Kindest Regards,
> Laura
>
> On 10/28/15, Shawn Henry <shawn@w3.org> wrote:
> > Re below: Is the fundamental issue that:
> > 1. images that provide contextual information should not be included via
> CSS
> > background?
> > *or*
> > 2. high contrast mode (HCM) and other setting should not turn off
> background
> > images?
> > *or*
> > 3. users should have the option of turning background images on or off in
> > HCM and other settings?
> > *or*
> > 4. other...
> >
> >
> >
> > On 10/28/2015 10:52 AM, Laura Carlson wrote:
> >> Hi Shawn Jon, and all,
> >>
> >> Good catch, Jon. That is one of  our use cases page. It is currently
> >> the second point under color and contrast with the unique identifier
> >> [Laura, UC-7] .
> >>
> https://www.w3.org/WAI/GL/low-vision-a11y-tf/wiki/User_stories_-_use_cases#Color_and_Contrast
> >>
> >> It might be good to include the unique identifier [Person, UC-#]  from
> >> the "User stories - use cases" on the user requirements table for
> >> reference, mapping and to be sure we don't miss others, which should
> >> be included.
> >
> > Done (after I post the up date :-).
> > ~Shawn
> >
> >>
> >> Thanks.
> >>
> >> Best Regards,
> >> Laura
> >>
> >> On 10/28/15, Jonathan Avila <jon.avila@ssbbartgroup.com> wrote:
> >>> Shawn, I wanted to discuss another potential item for the user
> >>> requirements
> >>> - what about removal of background/non-decorative images.  That is a11y
> >>> features such as High contrast in Windows will remove background images
> >>> that
> >>> are seen as decorative from the page content.  This is an issue when
> >>> background image techniques are incorrectly used by developers with
> >>> meaningful images and then content is missing.  If this is already
> >>> covered -
> >>> please excuse this note.
> >>>
> >>> Best Regards,
> >>>
> >>> Jonathan
> >>>
> >>> --
> >>> Jonathan Avila
> >>> Chief Accessibility Officer
> >>> SSB BART Group
> >>> jon.avila@ssbbartgroup.com<mailto:jon.avila@ssbbartgroup.com>
> >>> Phone 703.637.8957
> >>> Follow us: Facebook<http://www.facebook.com/#!/ssbbartgroup> |
> >>> Twitter<http://twitter.com/#!/SSBBARTGroup> |
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> >>> Blog<http://www.ssbbartgroup.com/blog> |
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> >>>
> >>>
> >>
> >>
> >
> >
>
>
> --
> Laura L. Carlson
>
>


-- 
Jim Allan, Accessibility Coordinator
Texas School for the Blind and Visually Impaired
1100 W. 45th St., Austin, Texas 78756
voice 512.206.9315    fax: 512.206.9264  http://www.tsbvi.edu/
"We shape our tools and thereafter our tools shape us." McLuhan, 1964
Received on Friday, 30 October 2015 01:22:32 UTC

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