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HTML 

              
                <!DOCTYPE html>
<html lang="en">
  <head>    
      <script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false"></script>    
    <script>
       // p elements for displaying lat / long and address
       var displayCoords, myAddress; 
      
      // used with the google apis
      var geocoder;
      var map;
      var infowindow = new google.maps.InfoWindow();
      var marker;
      
      // Called when the page is loaded
      function init() {
        displayCoords=document.getElementById("msg");
        myAddress = document.getElementById("address");
        
        geocoder = new google.maps.Geocoder();
        
        // In order to show something even before a user clicked on the button
        var latlng = new google.maps.LatLng(34.0144, -6.83);
        
        var mapOptions = {
          zoom: 8,
          center: latlng,
          mapTypeId: 'roadmap'
        }
        map = new google.maps.Map(document.getElementById('map_canvas'), mapOptions); 
      }
      
       // Called when the button is clicked
       function getLocation() {
          if (navigator.geolocation) {
            navigator.geolocation.getCurrentPosition(showPosition);
          } else {
          displayCoords.innerHTML="Geolocation API not supported by your browser.";
       }
     }
  
    // Called when a position is available
    function showPosition(position) {
        displayCoords.innerHTML="Latitude: " + position.coords.latitude + 
            "<br />Longitude: " + position.coords.longitude;   
      
        // Display the map
        showOnGoogleMap(new google.maps.LatLng(position.coords.latitude, position.coords.longitude));
 
    }
 
 
    function showOnGoogleMap(latlng) {
        // Ask google geocoder for a surface address once we get a longitude and 
        // a latitude. In fact the reverse geocoder sends back an array of "guesses"
        // i.e. not only one address object, but several. Each entry in this array
        // has several properties like street, city, etc. We use the "formatted_address"
        // one here, but it might be interesting to get the detailed properties in other
        // applications like a form with street, city, zip code etc.
        geocoder.geocode({'latLng': latlng},reverseGeocoderSuccess);
      
        function reverseGeocoderSuccess(results, status) {
          if (status == google.maps.GeocoderStatus.OK) {
            // For debugging
            console.dir(results);
            
            if (results[1]) {
              map.setZoom(11);
              marker = new google.maps.Marker({
                  position: latlng,
                  map: map
              });
              infowindow.setContent(results[1].formatted_address);
              infowindow.open(map, marker);
              
              // Display address as text in the page
              myAddress.innerHTML="Adress: " + results[0].formatted_address;

            } else {
              alert('No results found');
            }
          } else {
            alert('Geocoder failed due to: ' + status);
          }
        } // end of reverseGeocoderSuccess
      }  // end of showOnGoogleMap
    </script>
  </head>
  <body onload="init()">
     <title>HTML5 + Geolocalisation + Google Maps API Reverse Geocoding</title>
    
    <p id="msg">Click the button to get your coordinates:</p>
    <p id="address"></p>
 
    <button onclick="getLocation()">Where am I ?</button>
      <div id="map_canvas" style="width: 500px; height: 300px"></div>
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