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RE: HTML 5 Canvas Accessibility Call on January 10

From: Richard Schwerdtfeger <schwer@us.ibm.com>
Date: Fri, 7 Jan 2011 13:35:58 -0600
To: "Shawn Warren" <swarren@aisquared.com>, "Tim Lalor" <tlalor@aisquared.com>
Cc: chuck@jumis.com, janina@rednote.net, public-canvas-api@w3.org, franko@microsoft.com, david.bolter@gmail.com, cyns@exchange.microsoft.com, public-html-a11y@w3.org, oedipus@hicom.net
Message-ID: <OF55867A7A.9CA7F2C7-ON86257811.0069E453-86257811.006BA9C4@us.ibm.com>
Shawn, Tim,

That is excellent. We are pleased AI Squared is able to attend the call.

The call-in information and agenda are here:


You will note that we also run an IRC channel where people will be taking
minutes. You can use use the free chatzilla plug-in to Firefox to

The W3C IRC server is:


The chat room is #html-a11y

As an FYI you will see at the bottom of the page above an attached file
called canvaseditor.html  This file shows how we are using a shadow DOM to
populate platform accessibility APIs for user drawn check boxes. A problem
is the lack of accurate positioning information. Some of which is addressed
in the change proposal (caret and focus ring) to the Canvas 2D Context API
calls. The proposed changes to the Canvas 2D API specification are marked
between <zzz> and </zzz> sections. Currently the DOM Accessibility API
mapping of the shadow DOM (this is all the elements that are children of
the <canvas> element in HTML) only is done in Beta versions of the IE 9
browser.  The shadow DOM is also participates in the keyboard navigation of
HTML in the IE 9 implementation.

Frank and David it will be very helpful if you are able to attend the call
on Monday.

Best Regards,

Rich Schwerdtfeger
CTO Accessibility Software Group

From:	"Shawn Warren" <swarren@aisquared.com>
To:	Richard Schwerdtfeger/Austin/IBM@IBMUS
Cc:	<janina@rednote.net>, <chuck@jumis.com>,
            <public-canvas-api@w3.org>, "Tim Lalor" <tlalor@aisquared.com>
Date:	01/07/2011 10:57 AM
Subject:	RE: Canvas Accessibility

Well I don’t know much…about a lot of things really ;)…but I usually do
know who to ask. I secured time from a senior engineer, Tim Lalor (CC),
for your next Monday meeting (1/10).


From: Richard Schwerdtfeger [mailto:schwer@us.ibm.com]
Sent: Thursday, January 06, 2011 7:48 PM
To: Shawn Warren
Cc: janina@rednote.net; chuck@jumis.com; public-canvas-api@w3.org
Subject: Canvas Accessibility

Hi Shawn,

I am not sure how much you know about HTML 5 <canvas> but requiring authors
to provide positioning information for all the content found in canvas is a
very expensive proposition. I am not sure we are going to be able to get
that to fly with authors. Would you be willing to discuss options on how we
can get you what you need for a Monday HTML Canvas Accessibility Meeting?

This is response to your email response to my question in December:

The canvas accessibility meeting runs at 2pm CST on Mondays for an hour.

Best Regards,


Rich Schwerdtfeger
CTO Accessibility Software Group

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Received on Friday, 7 January 2011 19:36:49 UTC

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