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RE: Checkpoint 2.2 (timed input): Examples of "required user input"?

From: Denis Anson <danson@miseri.edu>
Date: Mon, 26 Feb 2001 09:43:37 -0500
To: "'Ian Jacobs'" <ij@w3.org>, <w3c-wai-ua@w3.org>
Message-ID: <000101c0a002$8117e720$17dcc241@deniscomputer>
Ian,

I agree.  The only sense in which this example "requires" user input is
that if you don't respond in the allotted time, you don't get access to
some content.  So, access to that content "requires" a user response in
a specific time interval.

Another possible example would be a page that auto-advances, but has
content on it, rather than just having a link that it will auto-advance
to.  This is bad design, but we know that people do design poorly.

Denis Anson, MS, OTR/L
Assistant Professor
College Misericordia
301 Lake St.
Dallas, PA 18612
 

-----Original Message-----
From: w3c-wai-ua-request@w3.org [mailto:w3c-wai-ua-request@w3.org] On
Behalf Of Ian Jacobs
Sent: Saturday, February 24, 2001 1:36 PM
To: w3c-wai-ua@w3.org
Subject: Checkpoint 2.2 (timed input): Examples of "required user
input"?

Hello,

Checkpoint 2.2 of the 26 Jan 2001 Guidelines [1] reads:

  For content that requires user input within a time interval
  controlled by the user agent, allow configuration to make the time
  interval "infinite" (i.e., pause automatically at the beginning of
  each time interval where user input is required, and resume
  automatically after the user has explicitly completed
  input). [Priority 1]

Question: What examples do we have where the user agent
can recognize that content requires user input within a time
interval?

I think I have one example, from section 4.5.2 of the SMIL 1.0
specification [2]. In this example, links only "last" for the time
indicated by the "begin" and "end" attributes:

<video src="http://www.w3.org/CoolStuff">
  <anchor href="http://www.w3.org/AudioVideo" begin="0s" end="5s"/>
  <anchor href="http://www.w3.org/Style"      begin="5s" end="10s"/>
</video>

The combination of active element plus time interval means that user
interaction is limited in time. However, it is not clear to me that 
"user input is required within a time interval" in this case.
Nothing that I can see requires the user to activate that 
particular link.

There may be cases where user input truly is "required" within a given
time interval, but I don't have any examples of those. Perhaps it's
possible for the user agent to open timed user prompts, but I don't
know how that's done by the author (I don't know enough javascript).

I do not think that it's our intention to limit this checkpoint
to cases where user input is "required", only where user
interaction is available. I think that checkpoint 2.2 needs to 
broadened to something like this:

  When active elements are only available for
  a finite time interval controlled by the user agent, 
  allow configuration to make the time interval "infinite" 
  (i.e., pause automatically at the beginning of
  each time interval where user input is required, and resume
  automatically after the user has explicitly completed
  input). [Priority 1]

 -Ian

[1] http://www.w3.org/WAI/UA/WD-UAAG10-20010126/
[2] http://www.w3.org/TR/1998/REC-smil-19980615

-- 
Ian Jacobs (jacobs@w3.org)   http://www.w3.org/People/Jacobs
Tel:                         +1 831 457-2842
Cell:                        +1 917 450-8783
Received on Monday, 26 February 2001 09:45:17 GMT

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