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HTML5 supports a geolocation API. For example you can read your currently geolocation and display this postion on a google map via the following code HTML page.
<html>
<head>
<script type="text/javascript">
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(function(position) {
alert("Latitude: " + position.coords.latitude);
alert("Longitude: ' + position.coords.longitude);
});
navigator.geolocation.getCurrentPosition(function(position) {
document.location.href =
"http://maps.google.com/maps?q="
+ position.coords.latitude + ",+"
+ position.coords.longitude
+ "+(My%20position)&iwloc=A&hl=en";
});
}
</script>
</head>
<body>
</body>
</html>