W3C home > Mailing lists > Public > w3c-wai-gl@w3.org > July to September 2001

RE: guideline 7.1 about screen flickering (fwd)

From: Jo Miller <jo@bendingline.com>
Date: Thu, 26 Jul 2001 16:06:28 -0400
Message-Id: <p05100306b786215bf08e@[]>
To: w3c-wai-gl@w3.org
At 15:13 -0400 7/26/01, gregory j. rosmaita wrote:
>aloha, anne!
>thanks for playing in my sandbox!  four questions:
>1. is "RADAR" an acronym?  if so, do you know what it stands for?

Hello Greg,

It is an acronym, apparently, but I cannot find its expansion 
anywhere on the site.

>2. what is "AAMR"?

American Association on Mental Retardation, which is expanded the 
first time it occurs on the site's main page, but only in a graphic 
that lacks alt-text.

>3. what is the foreground color/color of the text?  is it green as well?
>(that seems to be the motif)
>4. is the font used a serif or sans-serif font?

The text is red, bold, capitalized, serif font.

>i suppose that no one who approaches the graphic with a tabula rasa would
>know the answers to the first 2 questions, which indicates to me that this
>particular graphic isn't a very successful conduit of information...

In fact I would go so far as to call it misleading. Because their 
specialized use of the acronym RADAR is not expanded or explained, 
and because the graphic represents the clockwise circular sweep of a 
radar (radio detecting and ranging) display, users might naturally 
assume that the link will take them to some page dealing with "radar" 
in its generic, literal sense.

>oh, one more question:
>5. would you follow this link out of the blue?  if so, why?

As a sighted person, I might follow it in hopes of getting off the 
page with the animations (seriously -- that was not meant as a 
flippant comment). Otherwise, probably not, so your point is well 

>On Wed, 25 Jul 2001, Anne Pemberton wrote:
>>  What a neat idea! I played in your sandbox, and hope I gave you an
>>  interesting description. I may not have answered the question of whether it
>  > flickers, but the animation is a smooth movement around the circle, not a
>  > flicker at all.

The link takes you to a Flash movie that reproduces the "radar-sweep" 
animation, but the circular movement in the Flash movie is far faster 
than in the image we've been looking at. I don't know whether this 
extremely rapid circular sweep would trigger seizures, but perhaps 
Wendy's resources will provide the answer.

The site in question is aamr.org, by the way.

Jo Miller
Received on Thursday, 26 July 2001 16:06:50 UTC

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