W3C home > Mailing lists > Public > public-html@w3.org > February 2010

Re: Ease of testing canvas accessible subtree

From: Ian Hickson <ian@hixie.ch>
Date: Fri, 5 Feb 2010 19:38:35 +0000 (UTC)
To: Philip Taylor <pjt47@cam.ac.uk>
Cc: HTML WG <public-html@w3.org>, Henri Sivonen <hsivonen@iki.fi>
Message-ID: <Pine.LNX.4.64.1002051937570.26790@ps20323.dreamhostps.com>
On Fri, 5 Feb 2010, Ian Hickson wrote:
> On Fri, 5 Feb 2010, Philip Taylor wrote:
> > 
> > To develop and test an accessible canvas application with focus 
> > management, I'd expect it would be much easier if the author could see 
> > the bitmap and the fallback content simultaneously, using their normal 
> > mouse and keyboard input to interact with either version, and check 
> > that both representations stay in sync and that the focus highlighting 
> > is handled correctly. Once they've finished testing, they would want 
> > the published version to work like it currently does (i.e. users are 
> > shown the bitmap if possible, else the fallback content is shown 
> > instead).
> > 
> > Is this possible with the current spec? If not, I think there should 
> > be a way to make the fallback content and bitmap visible together, 
> > e.g. <canvas showfallback>...</canvas> (and authors can add some CSS 
> > to the fallback content so it's rendered in a sensible position), to 
> > help with this kind of testing.
> That's a good point. I'm skeptical about allowing elements outside of 
> <canvas> be focused while drawFocusRing() renders, because that means 
> the screen would have two focus rings... but maybe that's ok?

(It would be a disaster while a magnifying AT is present, since the AT 
would be jumping back and forth trying to magnify both at once.)

Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'
Received on Friday, 5 February 2010 19:39:04 UTC

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