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Re: Techniques for Checkpoint 5.5

From: Ian Jacobs <ij@w3.org>
Date: Thu, 27 Jan 2000 13:02:09 -0500
Message-ID: <38908821.41725D01@w3.org>
To: Jon Gunderson <jongund@ux1.cso.uiuc.edu>
CC: w3c-wai-ua@w3.org
Jon Gunderson wrote:
> Current techniques for 5.5:
> 1. @@This needs work and probably should be in the guidelines@@. The
> exchange of information between user agents must keep pace with changes in
> the content. It may be necessary to allow the user to configure the user
> agent to pause before changes to content or the user interface so that an
> assistive technology has time to react.
> JRG: Unless we have an example of how this would work I would like to see
> it removed.  We can add it to a future issues list for the document or
> forwarded to the PF group, but I know off no technical way for AT and UA to
> do this or how it would help assistive technology.  This has been a
> consistently difficult checkpoint for developers to understand and I think
> this type of techniques suggestion will only add to the confusion on what
> should be a simple checkpoint to understand.

I disagree. I think the note indicates sufficiently that this concept
needs fleshing out.

> 2. Please refer to the appendix that explains how to load assistive
> technologies for DOM access.
> JRG: I would like to see this bullet changed to:
> "Loading assistive technologies into the same address space as the address
> space used by the UA reduces the time it takes for AT requests to the UA to
> be processed.  Examples of how to do this with diiferent operating systems
> can be found in an appendix to this document.  This is especailly important
> for access to the DOM"

Ok, with edits.

> Additional Bullet:
> Use operating system conventions for programmatic interfaces that require
> the least amount of operating system overhead for the exchange of
> information between assistive technologies and user agents.  The two ares
> of concern are for timeliness of access to the DOM and timeliness of access
> to user interface controls by assistive technologies.  In the case of user
> interface controls using standard system controls will typically support
> timely access.

Ok, with edits.

 - Ian

Ian Jacobs (jacobs@w3.org)   http://www.w3.org/People/Jacobs
Tel/Fax:                     +1 212 684-1814 or 212 532-4767
Cell:                        +1 917 450-8783
Received on Thursday, 27 January 2000 13:02:18 UTC

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