W3C home > Mailing lists > Public > public-html-a11y@w3.org > May 2011

RE: [media] alt technologies for paused video (and using ARIA)

From: John Foliot <jfoliot@stanford.edu>
Date: Fri, 13 May 2011 00:04:04 -0700 (PDT)
To: "'Silvia Pfeiffer'" <silviapfeiffer1@gmail.com>, "'Victor Tsaran'" <vtsaran@yahoo-inc.com>
Cc: "'HTML Accessibility Task Force'" <public-html-a11y@w3.org>, "'James Craig'" <jcraig@apple.com>, "'Michael Cooper'" <cooper@w3.org>, "'E.J. Zufelt'" <everett@zufelt.ca>
Message-ID: <021c01cc113b$efc41710$cf4c4530$@edu>
Silvia Pfeiffer wrote:
> 
> Would it not be much more useful to have:
> <video src=".." controls aria-label="Yahoo! Media Player showing blah
> blah blah" [poster=".."]>
> </video>

How would this render on screen for those users who have a very slow
connection and are browsing with images disabled, are using a text-only
browser, or have images disabled to save on download costs? 

No other instances of aria-label display text on screen (in fact the ARIA
spec states that it is inappropriate to do so), why should it here?


> 
> The way in which I look at the placeholder image is as a background
> image to the play button which contains information on why I should
> hit "play".

Then the aria-label there should be: aria-label="play button".

***************

"The purpose of aria-label is the same as that of aria-labelledby. It
provides the user with a recognizable name of the object. The most common
accessibility API mapping for a label is the accessible name property.

If the label text is visible on screen, authors SHOULD use aria-labelledby
and SHOULD NOT use aria-label. There may be instances where the name of an
element cannot be determined programmatically from the content of the
element, and there are cases where providing a visible label is not the
desired user experience. Most host languages provide an attribute that
could be used to name the element (e.g. the title attribute in HTML
[HTML]), yet this may present a browser tooltip. In the cases where a
visible label or visible tooltip is undesirable, authors MAY set the
accessible name of the element using aria-label. User agents give
precedence to aria-labelledby over aria-label when computing the
accessible name property."
(source:
http://www.w3.org/TR/2010/WD-wai-aria-20100916/states_and_properties#aria-
label) 


Situation C: If non-text content is a control or accepts user input:
  * G82: Providing a text alternative that identifies the purpose of the
non-text content using a short text alternative technique listed below 
  * H44: Using label elements to associate text labels with form controls
(HTML) 
  * H65: Using the title attribute to identify form controls when the
label element cannot be used (HTML)

(source:
http://www.w3.org/TR/2007/WD-UNDERSTANDING-WCAG20-20071211/text-equiv-all.
html) 

JF
Received on Friday, 13 May 2011 07:04:33 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Friday, 27 April 2012 04:42:38 GMT