<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
var canvas = document.getElementById("canvas");
var gl = canvas.getContext('webgl');
canvas.width = newWidth;
canvas.height = newHeight;
gl.viewport(0, 0, canvas.width, canvas.height);
</script>
</head>
<body>
<canvas id="canvas" style="width:50%; height:50%; background:#0F0;"/>
</body>
</html>
