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Re: Canvas shadow DOM question for interactive HTML5 elements

From: David Bolter <david.bolter@gmail.com>
Date: Thu, 07 Jan 2010 14:23:55 -0500
Message-ID: <4B4634CB.2070109@gmail.com>
To: Richard Schwerdtfeger <schwer@us.ibm.com>
CC: jcraig@apple.com, Frank Olivier <franko@microsoft.com>, public-canvas-api <public-canvas-api@w3.org>
Hi Rich,

I'm encouraging discussion on our Mozilla bug for this, but in the 
meantime I can say that no show-stoppers jump out at me. Am I correct 
that we are for now just discussing the feasibility of this approach, 
and not the merits? I'm not saying this approach isn't the best, but I 
just want to clarify the current goal here.

Aside: has this been mocked up yet? Perhaps with a div container that 
follows the canvas application, where the div subtree is displaced 
offscreen (via the -9999, -9999 hackery). It seems to me that we can 
test a lot of how this would work, without having to put the non-visual 
DOM underneath the canvas element.  I seem to recall someone having an 
action item on this.


On 07/01/10 11:56 AM, Richard Schwerdtfeger wrote:
> Hi David, James, Frank,
> The canvas working group has reached consensus that we should provide a
> shadow DOM for<canvas>  where the canvas UI is bond to accessible objects
> in the shadow DOM. Two things we need to agree on is being able to use
> standard input controls and contenteditable areas in the shadow DOM as will
> already be accessible in the browser. Since these interactive components
> are not visible and would be in the keyboard navigation sequence we need to
> know if this will be a problem for Firefox, Safari, or IE. Also,
> contenteditable provides a caret location, without which we would need to
> provide an API for the caret location to support magifiers and screen
> readers. We need to address these action items in the next 2 weeks.
> http://www.w3.org/WAI/PF/HTML/track/actions/4
> http://www.w3.org/WAI/PF/HTML/track/actions/5
> Rich:
> Rich Schwerdtfeger
> Distinguished Engineer, SWG Accessibility Architect/Strategist
Received on Thursday, 7 January 2010 19:24:28 UTC

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