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Re: References and contact (was: RE: guideline 7.1 about screen flickering (fwd))

From: Jason White <jasonw@ariel.ucs.unimelb.edu.au>
Date: Fri, 27 Jul 2001 09:53:01 +1000
Message-ID: <15200.44381.263660.632074@gargle.gargle.HOWL>
To: Wendy A Chisholm <wendy@w3.org>
Cc: Charles McCathieNevile <charles@w3.org>, w3c-wai-gl@w3.org
A suggestion: seizures are a very serious health consequence which may
result from viewing certain flickering effects. Thus I would tend to
be cautious and to say that until we are completely sure that those
who are likely to be affected have user agents which offer control
over these phenomena and can be expected to have set appropriate
configuration preferences, the responsibility should remain with the
author and we ought to conclude that the "until user agents"
qualifcation hasn't been met. In the Techniques documents we state
that flickering (within certain frequency ranges) must be avoided; and
so far in this discussion there does not appear to be compelling
evidence that the user agent support is, for practical purposes,

I think that in this particular case (given the health risks) we would
be justified in taking a more conservative approach to deciding when
the user agent support is adequate.

If clarification of the actual authoring requirement is needed, it
should go into the guidelines (WCAG 2.0 and/or techniques).

Perhaps after Wendy has collected information from relevant
specialists it will be possible to put forward a concrete proposal, if
need be.
Received on Thursday, 26 July 2001 19:53:08 UTC

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