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[Bug 23370] Strong Native Semantics table appears to imply @hidden trumps @aria-hidden

From: <bugzilla@jessica.w3.org>
Date: Fri, 27 Sep 2013 17:54:59 +0000
To: public-html-a11y@w3.org
Message-ID: <bug-23370-3290-8ZuiCs2M84@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=23370

--- Comment #9 from James Craig <jcraig@apple.com> ---
(In reply to Leif Halvard Silli from comment #6)
> (In reply to James Craig from comment #5)
> > ARIA defines conflict resolution here:
> > http://www.w3.org/WAI/PF/aria/complete#host_general_conflict
> > 
> > "When a host language declares a WAI-ARIA attribute to be in direct semantic
> > conflict with a native attribute for a given element, user agents MUST
> > ignore the WAI-ARIA attribute and instead use the host language attribute
> > with the same implicit semantic."
> 
> WAI-ARIA should have provided examples of what this means.

Bug 23383 is a less controversial example. @value, @min, and @max on <input
type="range" are identical to @aria-valuenow, @aria-valuemin, and
@aria-valuemax on role="slider"

> For instance, I
> guess that @alt on <img> is an attribute that is in direct conflict with
> @aria-label. No?

No. Labels are a special case. See the text alternative computation for more
examples of why.

http://www.w3.org/WAI/PF/aria/complete#textalternativecomputation

> I feel that you are putting it on an edge, though. Even if @hidden is
> boolean, it is a matter of fact that applying - or removing - @hidden on
> e.g. <script>, has no effect what so ever.

What? Does that mean it has no effect in browser X? In WebKit, adding @hidden
hides the element from the visual display and the accessibility tree. The
implementation detail is that the UA style sheet now includes:

[hidden]{display:none;}

> > I propose the change be to remove that line from the "strong" table (and
> > possibly add it to the "weak" table)
> 
> I concur with your proposal.

Steve, do you concur too?

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