HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>watchPosition demo</title>
</head>
<body>
  <h1>Watch position</h1>
  <p>Start watching — coordinates update when you move. Stop to save battery.</p>
  <button type="button" id="startBtn">Start watching</button>
  <button type="button" id="stopBtn">Stop (clearWatch)</button>
  <pre id="out">(not watching)</pre>

  <script>
    var watchId = null;
    var out = document.getElementById('out');

    function onSuccess(position) {
      var c = position.coords;
      out.textContent =
        'Update at ' + new Date().toLocaleTimeString() + '\n' +
        'Lat: ' + c.latitude + ', Lng: ' + c.longitude;
    }

    function onError(error) {
      out.textContent = 'Error: ' + error.message;
    }

    document.getElementById('startBtn').onclick = function () {
      if (!navigator.geolocation) {
        out.textContent = 'Geolocation not supported.';
        return;
      }
      if (watchId !== null) return;
      watchId = navigator.geolocation.watchPosition(onSuccess, onError);
      out.textContent = 'Watching... (allow location if prompted)';
    };

    document.getElementById('stopBtn').onclick = function () {
      if (watchId !== null) {
        navigator.geolocation.clearWatch(watchId);
        watchId = null;
        out.textContent = 'Stopped watching.';
      }
    };
  </script>
</body>
</html>

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Geolocation — watchPosition & clearWatch