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D3E defines "MediaTrackNext" and "MediaTrackPrevious". However, IE9 uses "MeditaNextTrack" and "MediaPreviousTrack". I'm not sure native English speakers feel better. So, I don't know if D3E should change the key names for IE9 or not.
Fixed in the latest version of the spec: r240 http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html?rev=1.240