playing the targets of cue and play-during

whose responsibility is it to fire and/or play the targets defined 
with the cue-before, cue-after, cue and play-during properties? 
[note 1]

the UserAgent's native audio support, the underlying OperatingSystem 
which provides system sounds (earcons), or the assistive technology?

i am willing to concede that it is the assistive technology that 
must trigger the aural rendering mechanism, but it should be a 
backplane event, like system sounds in the windows environment, or 
the annoying embedded sound in a web document set to play in a loop

Note 1:
   * cue-before and cue-after in CSS2

   * play-during in CSS2:

ACCOUNTABILITY, n. The mother of caution.
                 -- Ambrose Bierce, The Devil's Dictionary
         Gregory J. Rosmaita,
      Camera Obscura:
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Received on Thursday, 3 May 2007 05:55:24 UTC