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Re: Example canvas element use - accessibility concerns

From: Rob Sayre <rsayre@mozilla.com>
Date: Mon, 23 Feb 2009 21:36:52 -0500
Message-ID: <49A35D44.6080503@mozilla.com>
To: "John Foliot - WATS.ca" <foliot@wats.ca>
CC: 'HTML WG' <public-html@w3.org>, 'W3C WAI-XTECH' <wai-xtech@w3.org>
On 2/23/09 9:09 PM, John Foliot - WATS.ca wrote:
> Rob Sayre wrote:
>    
>> Mandating is not nudging. Recommending fallback content is a 'nudge'.
>>
>>      
>
> No, recommending is a hint, a suggestion, do it or don't do it: it needs to
> have some weight behind it to become a nudge.
>    

As I have explained once already, the terms we're using have definitions 
(RFC 2119).

3. SHOULD   This word, or the adjective "RECOMMENDED", mean that there
    may exist valid reasons in particular circumstances to ignore a
    particular item, but the full implications must be understood and
    carefully weighed before choosing a different course.


This is not different than Ian's approach. In his draft, @alt text can 
be omitted if you have a valid reason.

>    For every image that has alt="picture"
> there is also one that has alt="useful alt text" - all simply because we
> (currently) *insist* that<img>  contain @alt.
>    

That data I've seen doesn't support that assertion. Here's one example:

<img>  elements with no alt attribute: 1104466 (47%)
<img>  elements with zero-length alt: 530687 (23%)
<img>  elements with non-empty whitespace-only alt: 11943 (1%)
<img>  elements with non-empty non-whitespace alt: 702702 (30%)

<http://lists.w3.org/Archives/Public/public-html/2008Apr/0536.html>

- Rob
Received on Tuesday, 24 February 2009 02:37:44 GMT

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