<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">

<script>
function boom()
{
  var fr = document.createElementNS("http://www.w3.org/1999/xhtml", "iframe");
  fr.src = "data:text/html,X";
  document.documentElement.appendChild(fr);
  var docType = fr.contentDocument.implementation.createDocumentType(undefined, "", "");
  document.removeChild(document.documentElement);
  document.appendChild(docType);
}

window.addEventListener("load", boom, false);
</script>

</svg>