aria-relevant = removals ?

Has any one implemented the aria-relevant = removals?  It seems to only
announce additions and not removals using FF3 and Jaws10.
 
  ul.setAttribute("role","log"); 
  ul.setAttribute("aria-live", "assertive"); 
  ul.setAttribute("aria-atomic", "false");
  ul.setAttribute("aria-relevant", "additions removals text");
  ul.setAttribute("aria-channel", "main");

Donald F. Evans
Sr. Program Manager,
Office of Accessibility,
AOL LLC
AIM: donaldfevans
Phone 703.265.5952