title: How can I block fake location in the web?
body: <p>I take user's location with javascript.How can i prevent fake location ?
  this is my code:</p>
  
  <pre><code>if (navigator.geolocation) {
      navigator.geolocation.getCurrentPosition(showPosition, showError);
  }
  </code></pre>
  
  <p>and it's showPosition function:</p>
  
  <pre><code>function showPosition() {
      Latitude  = position.coords.latitude;
      Longitude = position.coords.longitude;
  }
  </code></pre>