Playground: Testing Google Maps API on JSFiddle |

HTML

<script src="http://www.google.com/jsapi"></script>
<div id="map_div" style="width: 400px; height: 300px"></div>

<script type="text/javascript" src="http://www.google.com/jsapi"></script>

<script type="text/javascript">http://maps.googleapis.com/maps/api/js?key=AIzaSyB0BQTbkJxRw-tec2knUsoftd_SU3-SO-0
      </script>