Re: ARIA: Why is role="marquee" necessary? We already have role="log"

James,

One of the reasons that Freedom Scientific wanted Marquee was also so that
they could ignore the updates to that area of the web page - something you
would not do with log.

Rich

Rich Schwerdtfeger
Distinguished Engineer, SWG Accessibility Architect/Strategist
blog: http://www.ibm.com/developerworks/blogs/page/schwer


                                                                           
             James Craig                                                   
             <jcraig@apple.com                                             
             >                                                          To 
             Sent by:                  Aaron M                             
             wai-xtech-request         Leventhal/Cambridge/IBM@IBMUS       
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                                       WAI XTech <wai-xtech@w3.org>,       
                                       wai-xtech-request@w3.org            
             12/08/2008 02:31                                      Subject 
             AM                        Re: ARIA: Why is role="marquee"     
                                       necessary? We already have          
                                       role="log"                          
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           




Great explanation. The current description is just too vague then. I'll
make an editorial note to clear up the description of marquee.

On Dec 8, 2008, at 12:16 AM, Aaron M Leventhal wrote:

      role="marquee" is not like log, because in a marquee changes tend to
      be fast and constant. Typically you don't want to hear all the items
      as they scroll by in a marquee, because of the constant chatter that
      would entail. Therefore the default aria-live value for marquee is
      "off". Similar for role="timer" -- that's off by default as well.

      The concept is that where we can think of a very typical live region
      use case, ARIA provides a role. This is a higher level semantic and
      is easier for authors to know they're doing the right thing. They
      might not be sure whether a marquee/timer/log/status should be polite
      or off, but they can probably figure out that something is one of
      those objects.

      - Aaron

                                                                           
 From:    James Craig <jcraig@apple.com>                                   
                                                                           
 To:      WAI XTech <?wai-xtech@w3.org>                                   
                                                                           
 Date:    12/08/2008 03:07 AM                                              
                                                                           
 Subject: ARIA: Why is role="marquee" necessary? We already have           
          role="log"                                                       
                                                                           







      Why is role="marquee" necessary? We already have role="log" in the
      spec. Currently, the draft vaguely mentions, "A major difference
      between a marquee and a log is how fast it gets updates from timed or

      real world events."

      Unless someone has a good reason to keep it, I propose we ditch
      "marquee" and just use "log" for all instances.