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[Bug 19277] Relationship and precedence of hidden="" and display:none should be clarified/defined

From: <bugzilla@jessica.w3.org>
Date: Sat, 06 Oct 2012 02:35:22 +0000
Message-Id: <E1TKKEc-0004jo-Fp@jessica.w3.org>
To: public-html-bugzilla@w3.org
https://www.w3.org/Bugs/Public/show_bug.cgi?id=19277

--- Comment #13 from Leif Halvard Silli <xn--mlform-iua@xn--mlform-iua.no> 2012-10-06 02:35:21 UTC ---
(In reply to comment #0)

> is @hidden equal to display:none? What happens if the author changes to
> display:block but leaves @hidden set? 
> 
> In discussion, the group concluded that the spec should say explicitly that
> @hidden trumps all CSS. Regardless of what changes are made to CSS for an
> element, all the processing requirements for @hidden elements remain in effect.
> For CSS changes to have any impact, the author would have to remove @hidden.

The hidden (sic!) issue here ie @hidden's mapping to ARIA-hidden="true", which
causes AT to not 'see' an element such as <foo hidden
style="display:block">Text</foo>.

If we stopped linking hidden="" to aria-hidden="true", then the hidden issue
would go away as making the hidden="" elements visible would also render them
to AT. Such a change would also 'pave the way' for allowing hidden=" to be used
for tab panels - see bug 19159. I don't know what the A11Y experts feel about
this.

If we contineu to link hidden="" to aria-hidden="true", then I agree with Tab
that it could make sense to use [hidden]{display:none!important} in the user
agent CSS, to make it more difficult to accidentically make hidden content
visible.  Such a change would also be a step towards what the A11Y telcon
concluded, I think.

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Received on Saturday, 6 October 2012 02:35:24 GMT

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