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Re: Proposed clarification to checkpoints 3.3, 3.5, 3.6

From: Ian Jacobs <ij@w3.org>
Date: Mon, 12 Jun 2000 10:49:09 -0400
Message-ID: <3944F865.7CD1C7B9@w3.org>
To: Jon Gunderson <jongund@uiuc.edu>
CC: w3c-wai-ua@w3.org
Jon Gunderson wrote:
> 
> Ian,
> For some types of cognitive disabilities, people with visual impairments
> and some types of screen reder and magnification software my  
> understanding  was that it was important to turn off the
> rendering or not allow the rendering of video.  
> Freeze may work for many people, but may not work for
> all people.  What is the advantage of freezing a frame?

It sounds like there are a couple of requirements:
1) Stop things from moving
2) Stop things from being too busy (e.g., don't open
   too many viewports).

But is "don't render content" a requirement? If so, then
why (still) video content and not graphically rendered
text? Or graphics? I don't think we have a requirement
for "make this page less busy" - the closest we get is
"don't open too many viewports". 

So what are the accessibility requirements surrounding
video and animation that freezing does not address?

 - Ian

> At 10:33 PM 6/9/00 -0400, Ian Jacobs wrote:
> >Hello,
> >
> >Please consider the following editorial clarification to
> >checkpoints 3.3, 3.5, and 3.6 (of the 7 May draft [1]):
> >
> >  3.3 Allow the user to turn on and off rendering of video.
> >      [Priority 1]
> >
> >  3.5 Allow the user to turn on and off animated or
> >      blinking text. [Priority 1]
> >
> >  3.6 Allow the user to turn on and off animations and
> >      blinking images. [Priority 1]
> >
> >After discussion with Charles and Eric Hansen about
> >these checkpoints, we concluded that the requirement
> >was to "freeze" video and animations. The term
> >"turn on and off" may be construed to mean "do not
> >render at all" but I don't believe that is the requirement
> >expressed by these checkpoints. The accessibility problem
> >in these cases (unless I am mistaken) arises from the
> >distraction of the motion, not the mere rendering of
> >the visual information. We do have a P2 checkpoint
> >about turning off the rendering of images (checkpoint 3.9).
> >Therefore, I propose using the term "freeze" instead
> >of "turn on and off" for these three checkpoints.
> >
> >  - Ian
> >
> >
> >[1] http://www.w3.org/WAI/UA/WD-UAAG10-20000507

-- 
Ian Jacobs (jacobs@w3.org)   http://www.w3.org/People/Jacobs
Tel:                         +1 831 457-2842
Cell:                        +1 917 450-8783
Received on Monday, 12 June 2000 10:49:14 GMT

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