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Re: Working Group Decision on ISSUE-31 / ISSUE-80 validation survey

From: Leif Halvard Silli <xn--mlform-iua@xn--mlform-iua.no>
Date: Tue, 19 Apr 2011 01:30:54 +0200
To: Aryeh Gregor <Simetrical+w3c@gmail.com>
Cc: Maciej Stachowiak <mjs@apple.com>, HTMLWG WG <public-html@w3.org>
Message-ID: <20110419013054565948.692f30da@xn--mlform-iua.no>
Aryeh Gregor, Mon, 18 Apr 2011 18:35:16 -0400:
> On Mon, Apr 18, 2011 at 4:33 PM, Maciej Stachowiak <mjs@apple.com> wrote:
>> After considering all these arguments, it seems established that there
>> is a valid use case for allowing the alt attribute to be omitted when
>> the generator mechanism is specified. This use case makes for a
>> moderately strong objection. However, the claim of negative
>> consequences to disallowing this use case was somewhat weakened by the
>> lack of concrete evidence that bogus values have been used in the past
>> or would be used in the future.
> [...] I'd like to provide some concrete evidence on this point,
> the two images on the bottom right all have alt="":
> http://en.wikipedia.org/w/index.php?title=Cwm_Penmachno&oldid=383061670

> Since no alt text was provided using the "|alt=" parameter, empty alt
> text is automatically inserted so that the page validates.  In older
> MediaWiki versions, the caption would be repeated in the alt text,
> leading to the caption being read twice by screen readers -- again,
> the motivation being to ensure that it validates.  This was changed to
> empty alt text so that at least it wouldn't be repeated.
> <https://bugzilla.wikimedia.org/show_bug.cgi?id=368>

According to HTML5's current rules (before the Decision has been 
applied, and hopefully after it is applied as well), then: [1]

]] When an a element that creates a hyperlink, or a button element, has 
no textual content but contains one or more images, the alt attributes 
must contain text that together convey the purpose of the link or 

Due to the lack of @alt text, VoiceOver currently tries to repair by 
reading aloud the URL of the anchor element wrapper.

leif halvard sillli
Received on Monday, 18 April 2011 23:31:25 UTC

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