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[
    Conditional=GEOLOCATION,
    ImplementationLacksVTable
] interface GeolocationCoordinates {
    readonly attribute unrestricted double latitude;
    readonly attribute unrestricted double longitude;
    readonly attribute unrestricted double? altitude;
    readonly attribute unrestricted double accuracy;
    readonly attribute unrestricted double? altitudeAccuracy;
    readonly attribute unrestricted double? heading;
    readonly attribute unrestricted double? speed;
    
    // Non standard.
    [EnabledBySetting=GeolocationFloorLevel] readonly attribute unrestricted double? floorLevel;
};