RE: ACTION-2107: Precedence of aria-details over aria-describedby

Rich,

 

The statement about precedence does not include any normative language. And,
I still do not understand what it means. 

 

If both aria-describedby and aria-details are specified on the same element,
is either the user agent or assistive technology supposed to do something
special? If either or both are supposed to do something, what is it that
they do?

 

Matt

 

From: Rich Schwerdtfeger [mailto:richschwer@gmail.com] 
Sent: Saturday, August 13, 2016 9:22 AM
To: Matt King <a11ythinker@gmail.com>
Cc: ARIA Working Group <public-aria@w3.org>
Subject: Re: ACTION-2107: Precedence of aria-details over aria-describedby

 

That is true. However, we did not see the need for multiple descriptions.
Also, if you change that it would be a normative change. 

 

Since both define a description, the reason for the precedence is that
authors can hide aria-details content where they are not allowed to with
aria-details - meaning it is accessible to everyone and not just AT users.
aria-details is intended to be shown. 

 

Rich

 

Rich Schwerdtfeger

 

 

 

On Aug 12, 2016, at 4:56 PM, Matt King <a11ythinker@gmail.com
<mailto:a11ythinker@gmail.com> > wrote:

 

WRT completing ACTION-2107, Make editorial changes to aria-details, I have
one question.

 

What is the intended meaning of the following sentence from the aria-details
specification?

"When both aria-describedby and aria-details are provided on an element
aria-details takes precedence."

 

Since aria-details is not part of the name and description calculation, it
clearly does not refer to precedence in that calculation. Does it refer to a
user agent behavior? If not, whose is responsible for creating the
precedence, and how is that precedence manifest?

 

Thanks,

matt