<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script>
function boom()
{
var v = document.getElementById("v");
v.src = "data:text/plain,_";
document.documentElement.appendChild(v);
}
</script>
</head>
<body onload="boom();"><video id="v" src="data:video/ogg;codecs="theora,vorbis",1"></video></body>
</html>