public TextTrack AddTextTrack(TextTrackKind kind, string label, string language) { return default(TextTrack); }
public TextTrack AddTextTrack(TextTrackKind kind) { return default(TextTrack); }
public TextTrack AddTextTrack(TextTrackKind kind, string label, string language) { return default(TextTrack); }
public TextTrack AddTextTrack(TextTrackKind kind) { return default(TextTrack); }