<!DOCTYPE html>
<iframe style="display:none" srcdoc="

<html>
<head>
<script type='text/javascript'>
function boom() {
    var gl = canvas.getContext('experimental-webgl');
    video.srcObject = canvas.captureStream(0);
}
</script>
</head>
<body onload='boom();'>
    <video id='video' width='256' height='256'></video>
    <canvas id='canvas' width='256' height='256'></canvas>
</body>
</html>

"></iframe>
