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Re: guideline 7.1 about screen flickering (fwd)

From: gregory j. rosmaita <oedipus@hicom.net>
Date: Thu, 26 Jul 2001 22:19:55 -0400
To: <w3c-wai-gl@w3.org>, <mcmay@bestkungfu.com>
MM: Turning off images completely and relying on alt text is the only real
solution involving the user agent, and I find that to be really excessive in

GJR: what you described is the state-of-the-art, and the UA WG, after much
deliberation, agreed that turning off all images to control such behavior is
considered too draconian a remedy, hence the UAAG requirements that a user
be able to step through an animation (the P1 checkpoints 4.4 "slow
multimedia" and 4.5 "start, stop, pause, advance multimedia", as well as the
P2 checkpoints 4.7 "slow other multimedia" and 4.8 "control other
multimedia", which cover quote Purely stylistic effects [which] include
background sounds, decorative animated images, and effects caused by style
sheets. The style exception of this checkpoint is based on the assumption
that authors have satisfied the requirements of the "Web Content
Accessibility Guidelines 1.0" [WCAG10] not to convey information through
style alone (e.g., through color alone or style sheets alone). unquote)

in addition, if too many items or icons on the page is a source of
distraction, confusion, or perceptual disruption/dislocation for a
particular user (examples available upon request) there is the P3 checkpoint
2.10, which states: quote Once the user has viewed the original
author-supplied content associated with a placeholder, allow the user to
turn off the rendering of the author-supplied content unquote, as well as
the P1 checkpoint 3.2: "Allow configuration not to render audio, video, or
animated images except on explicit user request. This configuration is
required for content rendered without any user interaction (including
content rendered on load or as the result of a script), as well as content
rendered as the result of user interaction (e.g., when the user activates a
link). The user agent may satisfy this checkpoint by making video and
animated images invisible and audio silent, but this technique is not
recommended. When configured not to render content except on explicit user
request, the user agent is not required to retrieve the audio, video, or
animated image from the Web until requested by the user. unquote

CONSERVATIVE, n.  A statesman who is enamored of existing evils,
as distinguished from the Liberal, who wishes to replace them
with others.         -- Ambrose Bierce, _The Devil's Dictionary_
             Gregory J. Rosmaita, oedipus@hicom.net
  Camera Obscura: http://www.hicom.net/~oedipus/index.html
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Received on Thursday, 26 July 2001 22:19:02 UTC

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