The Tor Browser / file revision

 <svg width="100%" height="100%" xmlns="http://www.w3.org/2000/svg" onload="setTimeout(boom, 30)" class="reftest-wait">

 <script>

 var originalRoot = document.documentElement;

 var svgCircle;

 function boom()

 {

   var SVG_NS = "http://www.w3.org/2000/svg";

   var svgPolyline = document.createElementNS(SVG_NS, 'polyline');

   svgCircle   = document.createElementNS(SVG_NS, 'circle');

   svgCircle.appendChild(svgPolyline);

   document.removeChild(originalRoot);

   document.appendChild(svgCircle);

   setTimeout(restore, 30);

 }

 function restore()

 {

   // We have to put it the root element back in the document so that reftest.js

   // sees the event for the removal of class="reftest-wait"!

   document.removeChild(svgCircle);

   document.appendChild(originalRoot);

   document.documentElement.removeAttribute("class");

 }

 </script>

 </svg>