Y si querés que no salga en local, agregale esto justo luego del tag body:
<!-- saved from url=(0013)about
:internet -->
Código PHP:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title></title>
</head>
<body>
<!-- saved from url=(0013)about:internet -->
<script>
alert('maldito explorer');
</script>
</body>
</html>