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function loadDemo() {
    if (navigator.geolocation) {
        document.getElementById("support").innerHTML = "Geolocation supported.";
    } else {
        docment.getElementById("support").innerHTML = "Geolocation is not supported in your browser.";
    }
}

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void getCurrentPosition(in PositionCallback successCallback, 
                             in optional PositionErrorCallback errorCallback,
                             in optional PositionOptions options);