The Tor Browser / file revision

 <!--

      Any copyright is dedicated to the Public Domain.

      http://creativecommons.org/publicdomain/zero/1.0/

 -->

 <svg xmlns="http://www.w3.org/2000/svg" onload="createFilter();">

   <title>Testcase for filter result property</title>

   <!-- From https://bugzilla.mozilla.org/show_bug.cgi?id=935902 -->

   <defs>

     <filter id="f1">

       <feGaussianBlur id="gb" in="SourceGraphic" stdDeviation="4"/>

       <feColorMatrix values="1 0 0 0 0  0 0.333 0 0 0  0 0 1 0 0  0 0 0 1 0" in="blur"/>

     </filter>

   </defs>

   <circle cx="100" cy="50" r="50" fill="yellow" filter="url('#f1')"/>

   <script type="text/javascript">

     function createFilter() {

       document.getElementById('gb').result.baseVal = 'blur';

     }

   </script>

 </svg>