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

I agree with Laura and Jon. Doesn't matter who or what caused the problem,
HCM and background images IS a low vision issue.
Jim

On Tue, Nov 3, 2015 at 3:36 PM, Laura Carlson <laura.lee.carlson@gmail.com>
wrote:

> Hi Shawn,
>
> It is an issue for people with low vision who do not use a screen
> reader but rather Windows High Contrast Mode.
>
> Check what Jon wrote back in July, "...This forces users with low
> vision who use high contrast or ignore colors to completely turn off
> CSS for the page.  Requiring the user to turn off CSS to simply have
> access to a meaningful image that the developer should not have made a
> presentation layer image is an issue for me."
> https://lists.w3.org/Archives/Public/w3c-wai-gl/2014JulSep/0090.html
>
> Me too.
>
> As Aurelien Levy said "I think there is two things that may lead to
> think it's not a failure :
> - there is a sufficient technique allowing to use hidden text with css
> http://www.w3.org/TR/WCAG20-TECHS/C7.html (so same technique but in
> one  case is a failure and in an other case it's not)
> - for me an association with the guideline 1.3 is missing because
> using  user css or high contrast mode is clearly a case where content
> is presented in different ways and it must be without losing
> information or structure."
> https://lists.w3.org/Archives/Public/w3c-wai-gl/2014JulSep/0091.html
>
> Thanks,
> Laura
>
> On 11/3/15, Shawn Henry <shawn@w3.org> wrote:
> > Laura Carlson wrote:
> >> WCAG has Technique F3: Failure of Success Criterion 1.1.1 due to using
> CSS
> >> to include images that convey important information
> >
> > Right! Thanks for the reminder.
> >
> > So this issue is not specific to low vision.
> >
> > ~Shawn
> >
> >
> >
> > Laura Carlson 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