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Right now there is an AddTextTrack() function on the MediaElement, but there is no RemoveTextTrack() function. TextTrackList has an "onremovetrack" event, but as far as I can see there is no way currently for the user to remove a TextTrack.
EDITOR'S RESPONSE: This is an Editor's Response to your comment. If you are satisfied with this response, please change the state of this bug to CLOSED. If you have additional information and would like the Editor to reconsider, please reopen this bug. If you would like to escalate the issue to the full HTML Working Group, please add the TrackerRequest keyword to this bug, and suggest title and text for the Tracker Issue; or you may create a Tracker Issue yourself, if you are able to do so. For more details, see this document: http://dev.w3.org/html5/decision-policy/decision-policy.html Status: Wontfix Rationale: As per discussion of cloned by in WHATWG, there is no need for this feature at this time, so marking WONTFIX for now.