W3C home > Mailing lists > Public > public-html@w3.org > February 2012

Re: Using @aria-describedby for long described image links [Was: Using an image map for long described image links [Was: Revert Request]]

From: Leif Halvard Silli <xn--mlform-iua@xn--mlform-iua.no>
Date: Thu, 9 Feb 2012 20:29:10 +0100
To: Jonas Sicking <jonas@sicking.cc>
Cc: Charles Pritchard <chuck@jumis.com>, Maciej Stachowiak <mjs@apple.com>, Steve Faulkner <faulkner.steve@gmail.com>, Benjamin Hawkes-Lewis <bhawkeslewis@googlemail.com>, John Foliot <john@foliot.ca>, Matthew Turvey <mcturvey@gmail.com>, Leif Halvard Silli <xn--mlform-iua@xn--mlform-iua.no>, Silvia Pfeiffer <silviapfeiffer1@gmail.com>, Laura Carlson <laura.lee.carlson@gmail.com>, Sam Ruby <rubys@intertwingly.net>, Paul Cotton <Paul.Cotton@microsoft.com>, HTML WG <public-html@w3.org>
Message-ID: <20120209202910887709.31723c3b@xn--mlform-iua.no>
Jonas Sicking, Wed, 8 Feb 2012 18:47:56 -0800:
> The semantic meaning of the contents of a canvas is obviously
> different from the semantic meaning of the contents of a hidden
> element.
> However implementation-wise, the reason that they are special when
> exposed to AT is exactly the same.
> In firefox, the reason that @hidden elements are "stringified" when
> exposed through aria-describedby is because they don't have CSS boxes.
> This is also why we have problems currently when exposing the contents
> of a <canvas>. In both cases the accessibility code "fails" because it
> tries to use the CSS boxes which aren't there. Hence the fallback to
> stringify.

Just to clarify: Are you saying that whenever @aria-describedby points 
to *non-hidden* content, then Firefox presents the fragment[s] that it 
points to with full semantics?

In my previous tests, with VoiceOver, then I could not hear any 
difference that depended on whether the element[s] to which 
@aria-describedby pointed, were visible or not.
Leif H Silli
Received on Thursday, 9 February 2012 19:29:49 UTC

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