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flickering / animations

From: Charles McCathieNevile <charles@w3.org>
Date: Wed, 12 Jan 2000 09:19:26 -0500 (EST)
To: WAI GL <w3c-wai-gl@w3.org>
cc: Emmanuelle Gutiérrez y Restrepo <emmanuelle@retemail.es>
Message-ID: <Pine.LNX.4.20.0001120906290.32503-100000@tux.w3.org>
I have been looking over various sets of guidelines recently, to see what
other people are saying.

A particular point is with animation. We recommed not using them until they
can b turned off, and the browser support page notes that it is possible to
turn off images. It is also possible in Netscape 4.61 (Linux) to stop
animations (press the ESC key, or right click on the page for a menu that
offers it as an option. This feture is not available in Netscape 4.5 for
win95. Amaya does not support animated gifs. There is an applet which creates
a wobbly reflection of an image - there is an example of it at
http://www.wendyrule.com - but if you click on the applet it stops moving
(and click again to start it). I believe this is open source (I once ased the
page designer) and if so I will look for the source for the techniques

At http://www.sidar.org/anima.htm there is a suggestion to use the LOWSRC
attribute for an img to point to a non-moving version. (This was to get
around a technical problem with a Screenreader). lowsrc isn't part of the
HTML spec, but it may be innteresting to ask WAI-PF to look at this approach
as part of the work on XHTML 1.1. If you don't read spanish the babelfish
translation more or less makes sense - go to http://babelfish.altavista.com
and you can supply the other URI for translating.

Does anyone have other test cases? What do screen readers do when there is a
scrolling message in the status bar - does anyone know?


Charles McCN

Charles McCathieNevile    mailto:charles@w3.org    phone: +61 (0) 409 134 136
W3C Web Accessibility Initiative                      http://www.w3.org/WAI
21 Mitchell Street, Footscray, VIC 3011,  Australia 
Received on Wednesday, 12 January 2000 09:19:30 UTC

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