<script>
function go() {
  a.children[0].appendChild(b)
}
</script>
<body onload=go()>
<svg id="a">
<foreignObject>
<li>
<video controls="" autoplay="">
<li id="a" contenteditable="true">
</li>
</svg>
<canvas id="b">
<svg>
<use xlink:href="#a">
