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

From: Jonathan Avila <jon.avila@ssbbartgroup.com>
Date: Wed, 28 Oct 2015 22:17:54 +0000
To: Shawn Henry <shawn@w3.org>, "public-low-vision-a11y-tf@w3.org" <public-low-vision-a11y-tf@w3.org>
Message-ID: <BY2PR03MB2728B493D019004160E6F3C9B210@BY2PR03MB272.namprd03.prod.outlook.com>
A user requirement would be something like "users can turn off background images" where background images are defined as being non-informative images.  In general complex background images can make reading content on top of them difficult.  Background images also make controlling the color of foreground and background text less predictable and backgrounds such as gradients may prove problematics as they have variable contrast.

The other aspects of my HCM examples were provided as background information on current implementation(s).


Jonathan Avila
Chief Accessibility Officer

703-637-8957 (o) 
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-----Original Message-----
From: Shawn Henry [mailto:shawn@w3.org] 
Sent: Wednesday, October 28, 2015 5:25 PM
To: public-low-vision-a11y-tf@w3.org
Subject: CSS background images and HCM [was: Low vision user requirements wiki page]

Re below: Is the fundamental issue that:
1. images that provide contextual information should not be included via CSS background?
2. high contrast mode (HCM) and other setting should not turn off background images?
3. users should have the option of turning background images on or off in HCM and other settings?
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_c

> ases#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 :-).

> 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
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Received on Wednesday, 28 October 2015 22:18:26 UTC

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