RE: Query about intent of aria-expanded

It looks like I was typing at the same time.

So would aria-expanded='true' be applied to the container with role=tabpanel as well?

That part is somewhat confusing to me, because setting the aria-expanded attribute doesn't affect the visibility of the element, and if it is already rendered and readable, wouldn't it already be implicitly expanded?

-----Original Message-----
From: Joseph Scheuhammer [mailto:clown@alum.mit.edu] 
Sent: Tuesday, September 09, 2014 10:52 AM
To: Karl Groves; James Craig
Cc: Léonie Watson; W3C WAI Protocols & Formats
Subject: Re: Query about intent of aria-expanded

> So would the best practice be to place it on both the control and the 
> section being expanded/ collapsed (IOW not either-or)?

That depends on the context or role.  For a tree view [1], aria-expanded on the controller is important, but it can't be applied to the exposed children.  Consider that the children themselves are potentially expandable  -- that is, they might have children as well.  Thus, their aria-expanded is set to true when they themselves are expanded, not because their controller (parent) is expanded.

On the other hand, in the case of tablist [2], it's possible to place it on both the controlling tab [3] and the controlled tabpanel [4] without the above limitation.

[1] http://www.w3.org/TR/wai-aria/roles#tree

[2] http://www.w3.org/TR/wai-aria/roles#tablist

[3] http://www.w3.org/TR/wai-aria/roles#tab

[4] http://www.w3.org/TR/wai-aria/roles#tabpanel


--
;;;;joseph.

'Array(16).join("wat" - 1) + " Batman!"'
            - G. Bernhardt -

Received on Tuesday, 9 September 2014 17:59:38 UTC