// https://w3c.github.io/geolocation/#coordinates_interface
[Exposed=Window, SecureContext]
interface GeolocationCoordinates {
    readonly attribute double accuracy;
    readonly attribute double latitude;
    readonly attribute double longitude;
    readonly attribute double? altitude;
    readonly attribute double? altitudeAccuracy;
    readonly attribute double? heading;
    readonly attribute double? speed;
    [Default] object toJSON();
};