W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<body>
<h1>HTML Geolocation</h1>
<p>Click the button to get your coordinates.</p>

function getLocation() {
  if (navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(success, error);
  } else { 
    x.innerHTML = "Geolocation is not supported by this browser.";
  }
}

function success(position) {
  x.innerHTML = "Latitude: " + position.coords.latitude + 
  "<br>Longitude: " + position.coords.longitude;
}

function error(error) {
  switch(error.code) {
    case error.PERMISSION_DENIED:
      x.innerHTML = "User denied the request for Geolocation."
      break;
    case error.POSITION_UNAVAILABLE:
      x.innerHTML = "Location information is unavailable."
      break;
    case error.TIMEOUT:
      x.innerHTML = "The request to get user location timed out."
      break;
    case error.UNKNOWN_ERROR:
      x.innerHTML = "An unknown error occurred."
      break;
  }
}
</script>

</body>
</html>