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Re: Please vote on the canvas accessibility proposal

From: Ian Hickson <ian@hixie.ch>
Date: Wed, 24 Feb 2010 21:32:21 +0000 (UTC)
To: Richard Schwerdtfeger <schwer@us.ibm.com>
Cc: public-canvas-api@w3.org, "public-html-a11y@w3.org" <public-html-a11y@w3.org>
Message-ID: <Pine.LNX.4.64.1002242127160.20980@ps20323.dreamhostps.com>
On Wed, 24 Feb 2010, Richard Schwerdtfeger wrote:
> > # "When authors use the canvas element, they must also provide content
> > # that, when presented to the user, conveys essentially the same 
> > # function or purpose as the bitmap canvas."
> That is not an RFC MUST.

It is a normative conformance requirement with the full weight of RFC 2119 
behind it, if that's what you mean.

> It also does not mean it is accessible if you are saying the canvas can 
> only act as a bitmap.

I don't see how something that "conveys essentially the same function or 
purpose", when presented to the user, can be anything _but_ accessible.

This is the same kind of requirement as we have for <img alt=""> ("the alt 
attribute [...] must convey the same message as the image specified in the 
src attribute", and so forth -- there's a whole huge section giving all 
the requirements for <img alt> being accessible).

Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'
Received on Wednesday, 24 February 2010 21:32:49 UTC

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