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<html>
<head>
<script type="application/javascript">
function draw() {
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
ctx.fillStyle = "red";
ctx.fillRect(0, 0, 500, 500);
ctx.save();
ctx.beginPath();
ctx.moveTo(30, 30);
ctx.lineTo(149, 30);
ctx.lineTo(150, 150);
ctx.lineTo(30, 150);
ctx.lineTo(30, 30);
ctx.clip();
ctx.clearRect(0, 0, 500, 500);
/**
* Work around a strange left edge offset problem in D2D.
*/
ctx.restore();
ctx.fillStyle = "red";
ctx.fillRect(0, 0, 1, 500);
ctx.fillStyle = "white";
ctx.fillRect(30, 30, 1, 120);
}
</script>
</head>
<body onload="draw()">
<canvas id="canvas" width="300" height="300"></canvas>
</body>
</html>
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