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<html>
<head>
<script>
onload = function() {
var canvas2d = document.createElement('canvas')
canvas2d.setAttribute('width', 0)
document.body.appendChild(canvas2d)
var ctx2d = canvas2d.getContext('2d')
ctx2d.fillStyle = 'black'
var gl = document.createElement('canvas').getContext('experimental-webgl')
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, canvas2d)
ctx2d.fillRect(0, 0, 1, 1)
}
</script>
</head>
<body>
</body>
</html>