<html>
<head>
<script type="text/javascript">
function go() {
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
ctx.mozCurrentTransform = [2, 0, 0, 2, 0, 0];
ctx.fillStyle = "blue";
ctx.fillRect(20, 20, 50, 50);
}
</script>
</head>
<body onload="go()">
<canvas id="canvas" width="200" height="200"></canvas>
</body>
</html>