W3C home > Mailing lists > Public > public-html-a11y@w3.org > March 2010

Re: resolution supporting navsubstree change proposal

From: Maciej Stachowiak <mjs@apple.com>
Date: Tue, 16 Mar 2010 02:31:37 -0700
Cc: Richard Schwerdtfeger <schwer@us.ibm.com>, Michael Smith <mike@w3.org>, public-html-a11y@w3.org
Message-id: <5063A592-B3EC-4C3C-A290-13149D312BE4@apple.com>
To: Steven Faulkner <faulkner.steve@gmail.com>

On Mar 16, 2010, at 2:17 AM, Steven Faulkner wrote:

> Hi maciej,
> >To reframe my earlier line of questioning - is it conforming to  
> specify navsubtree=false?
> yes, for example if there is a canvas based chart along with a html  
> table of the chart data:
> <canvas navsubtree="false"> your browser does not support the  
> graphical rendering of the data, browser x or y is required</canvas>
> <table>
> chart data
> </table>
> as in the current spec, the accessible alternative does not have to  
> be provided within the canvas. in the example above the accessible  
> alternative is provided outside of the canvas, the canvas content is  
> fallback.

That seems like a reasonable design. My only suggestion would be to  
make the attribute a more typical HTML boolean attribute; for most of  
them, only presence or absence matters, not the value. Since navigable  
subtree is the default, perhaps the attribute should be "nonavsubtree"  
or "nonav" or something like that, and then it can just be a normal  
HTML5 boolean attribute. (Those names don't read so great, but I think  
mixing the false/true pattern with the present/absent pattern is  

Received on Tuesday, 16 March 2010 09:32:13 UTC

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