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RE: Updating 2.4, rewritten

From: Gregg Vanderheiden <gv@trace.wisc.edu>
Date: Sun, 27 May 2001 17:33:33 -0500
To: "'Adam Victor Reed'" <areed2@calstatela.edu>, <w3c-wai-gl@w3.org>
Message-ID: <000001c0e6fd$10be5f80$066fa8c0@750>

I'm not sure we should take this approach (a do not use timeouts).   There
are reasons for doing this (security is one) and we shouldn't prohibit.  I
think we should adopt the approach used by UA and most other places... that
of giving a warning and allowing extra time.     There is a complication
with HTTP....   But maybe something could be written into a page....

Thoughts anyone?


-- ------------------------------
Gregg C Vanderheiden Ph.D.
Professor - Human Factors
Depts of Ind. and Biomed. Engr. - U of Wis.
Director - Trace R & D Center
Gv@trace.wisc.edu, http://trace.wisc.edu/
FAX 608/262-8848
For a list of our listserves send "lists" to listproc@trace.wisc.edu

 -----Original Message-----
From: 	w3c-wai-gl-request@w3.org [mailto:w3c-wai-gl-request@w3.org]  On
Behalf Of Adam Victor Reed
Sent:	Saturday, May 26, 2001 3:20 PM
To:	w3c-wai-gl@w3.org
Subject:	Updating 2.4, rewritten

The page which contains the timeout that prompted me to attempt a
revision of Guideline 2.4 is now


The text announcing the time-out is:

	"Due to the high demand and limited quantity of our available
	products, your selection(s) will be removed from your cart
	after 15 minutes of inactivity."

I have re-written my proposed update of Guideline 2.4 to reflect
discussion on the list.

2.4 Do not limit the time that a user may need to understand or
interact with your content.
	* Avoid demands that the user respond within a preset period.
	* Use automatic refresh and delayed redirection only when
	  necessary to bring superceded content up to date.
	* Content must cooperate with user agent mechanisms for
	  preventing motion (including flicker, blinking, flashing,
	  self-scrolling etc) and for control of the rate at which
	  it occurs. Note that flicker effects can cause seizures in
	  people with photoepilepsy.
				Adam Reed

Context matters. Seldom does *anything* have only one cause.
Received on Sunday, 27 May 2001 18:34:21 UTC

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