Re: Parallax and vestibular disorders

The WCAG 2.0  SC is only designed to detect content that is provocative for causing seizures. 

VR, movies with unsteady hands and many other things can cause nausea.     That was not the target of the current provision.   Those are not disabilities.   

Remember that the Guidelines are restricted  (at least they were) to accessibility issues — things that disproportionately affect people with disabilities in ways that substantially affect their ability to use Web Content. 


That said it HAS been shown that PATTERNS can also cause seizures.  It is much more complicated though — and there is no free tool for evaluating content for this so it was felt that we could not make an SC where there was no practical way for authors to test for conformance. 


ALSO - If people with disabilities are disproportionately affected by the nausea triggering content — that could be a reason to create a provision.   But you would have to have some tool that reliably measured this — and a criteria for when something would pass or fail.   That would be your biggest challenge.  

 

gregg

> On Jul 30, 2016, at 5:19 PM, Wayne Dick <wayneedick@gmail.com> wrote:
> 
> I got a little too specific on that sup-pixel example. What I meant is that the seizures SC just may be too narrow, and there might be a way to pull back and say that configurations that cause seizures or extreme discomfort (well defined of course) should not appear in web pages. The cases could change as the technology changes.
> 
> Wayne
> 
> On Thu, Jul 28, 2016 at 9:19 AM, Alastair Campbell <acampbell@nomensa.com <mailto:acampbell@nomensa.com>> wrote:
> Wayne wrote:
> 
> “There is  a different case involving text customization where sub-pixelation causes severe nausea.
> 
> https://www.w3.org/WAI/RD/2012/text-customization/p7.html <https://www.w3.org/WAI/RD/2012/text-customization/p7.html>
> It's almost like there should be a forbidden patterns criteria.”
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>  
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> That’s quite a different trigger, even if the effect on the person is similar.
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> Without wanting to go down a different rabbit hole, I’m curious if sub-pixel rendering is still an issue.
> 
> Browsers and devices have changed quite a bit since IE9 was new.
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>  
> 
> Anyway, best to stick to animation with user-interaction for this thread J
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> Cheers,
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>  
> 
> -Alastair
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>