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The spec should mention what to do when the playbackRate is zero, and when it is negative. fwiw, the |playbackRate| property for media element is specced as such: - positive case is trivial - zero pauses the element, without having |paused| == true - negative plays the media backward. WebKit treats negative and null value as illegal, and this is fine, but it should be specced.
(Somehow I clicked too fast, see bug 21594). *** This bug has been marked as a duplicate of bug 21594 ***