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RE: Why is aria-expanded invalid with a checkbox?

From: Schnabel, Stefan <stefan.schnabel@sap.com>
Date: Wed, 3 Feb 2016 07:42:01 +0000
To: Bryan Garaventa <bryan.garaventa@ssbbartgroup.com>, Birkir Gunnarsson <birkir.gunnarsson@deque.com>, James Nurthen <james.nurthen@oracle.com>
CC: "public-aria@w3.org" <public-aria@w3.org>
Message-ID: <53a4b72ac4d04d72866165bcd34f1fa0@DEWDFE13DE04.global.corp.sap>
To be used in which pattern? Collapse/Expand of regions?


-----Original Message-----
From: Bryan Garaventa [mailto:bryan.garaventa@ssbbartgroup.com] 
Sent: Mittwoch, 3. Februar 2016 00:39
To: Birkir Gunnarsson <birkir.gunnarsson@deque.com>; James Nurthen <james.nurthen@oracle.com>
Cc: public-aria@w3.org
Subject: RE: Why is aria-expanded invalid with a checkbox?

I vote we just add this role to the spec, it already works.


<input type="checkbox" aria-expanded="true" title="Test" />

This already sets the 'expanded' state in IE11, Firefox, and Chrome in the accessibility tree.

-----Original Message-----
From: Birkir Gunnarsson [mailto:birkir.gunnarsson@deque.com] 
Sent: Tuesday, February 02, 2016 3:27 PM
To: James Nurthen <james.nurthen@oracle.com>
Cc: public-aria@w3.org
Subject: Re: Why is aria-expanded invalid with a checkbox?

As a screen reader, if I move to a checkbox and hear:
"I hold a non immigrant visa, checkbox not checked collapsed"
(<input type="checkbox" aria-expanded="false" aria-controls="niv"> <div role="region" aria-label="None Immigrant Visa information" id="niv">


I would know that checking that checkbox will cause additional content to appear.

You are right that aria-controls hints at the same thing, but it is not necessarily tied to the display of a section of content.
It could be a submit button that becomes enabled only after I check the checkbox.
It could also be a section that is already visible on the page but checking the checkbox automatically changes default UI element settings.

the use of aria-expanded would clearly tell me that a section of the page will be expanded or collapsed as a result of me interacting with the checkbox, the non-visual equivalent of seeing content appear and disappear.

I am just perplexed why aria-expanded is allowed on so many roles, (I have some difficulty seeing the use cases for some of them), but not on a check box.

On 2/2/16, James Nurthen <james.nurthen@oracle.com> wrote:
> I'd have thought that checked in combination with aria-controls was 
> enough here.
> Unless the checked and expanded state can be different (which I don't 
> believe they could be) I would just use checked and aria-controls.
> On 2/2/2016 2:58 PM, Birkir Gunnarsson wrote:
>> Oh wise ones.
>> I am working with a team that is implementing a form where checking a 
>> check box expands a section further down the page.
>> They actually thought of putting aria-expanded and aria-controls on 
>> the check box to communicate this info to assistive technologies.
>> I had to stop the because checkbox role is not one of the 40 or so 
>> roles that allow the aria-expanded property.
>> I find this curious.
>> The situation I described, where sections of a dynamic form or 
>> webpage are displayed or hidden in response to user checking or 
>> unchecking a check box is quite common.
>> Sure, if the section of the page is, in content order, after the 
>> checkbox that controls it, users do not necessarily need to be aware 
>> of the change, but it is a very smart usability decision to inform 
>> the user that checking a checkbox affects contents elsewhere on the 
>> webpage.
>> My questions are:
>> 1. Why was aria-expanded not considered a valid attribute with check 
>> boxes and, 2. Can this case be revisited? If so I'd be happy to 
>> create an issue ticket if necessary.
>> Thanks
>> -Birkir
> --
> Regards, James
> Oracle <http://www.oracle.com>
> James Nurthen | Principal Engineer, Accessibility
> Phone: +1 650 506 6781 <tel:+1%20650%20506%206781> | Mobile: +1 415 
> 987
> 1918 <tel:+1%20415%20987%201918> | Video: james.nurthen@oracle.com 
> <sip:james.nurthen@oracle.com> Oracle Corporate Architecture
> 500 Oracle Parkway | Redwood Cty, CA 94065 Green Oracle 
> <http://www.oracle.com/commitment> Oracle is committed to developing 
> practices and products that help protect the environment

Birkir R. Gunnarsson
Senior Accessibility Subject Matter Expert | Deque Systems
2121 Cooperative Way, Suite 210
Herndon, VA, 20171

Ph: (919) 607-27 53
Twitter: @birkir_gun

Received on Wednesday, 3 February 2016 07:42:37 UTC

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