There are 2 progress bars exposed (unclear why 2), anyway because the timeline/scrubber is exposed as progressbar as the values change (when audio plays)the value updates are announced (by screen readers) over the audio content being played. test file: http://s.codepen.io/stevef/debug/yeJKJb suggest that the timeline/scrubber should not be exposed as progressbar or when active (audi playing) the porgressbar should be hidden in acc tree, so value change updates are muted.
I talked to Gijs about this, and suggested that this become a slider role instead of progress bar, since it is an interactive control and not just a status meter. Same goes for the volume slider, by the way, which I'm not sure how it is exposed right now. Haven't looked at this code in ages.
ROLE_SLIDER, or maybe a new ROLE_SCRUBBER?
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