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

<script type="text/javascript">

function boom()
{
  var f = document.getElementById("filter1");
  f.appendChild(document.createElementNS("http://www.w3.org/2000/svg", "feImage"));
  f.appendChild(document.getElementById("rect"));
}

window.addEventListener("load", boom, false);

</script>

<filter id="filter1"/><rect id="rect" filter="url(#filter1)"/>

</svg>