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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function test() {
var c = document.getElementById("c");
var ctx = c.getContext("2d");
ctx.fillStyle = "green";
ctx.fillRect(0, 0, 300, 150);
ctx.fillStyle = "red";
ctx.font = "36px sans-serif";
ctx.globalCompositeOperation = "destination-out";
ctx.fillText("HELLO", 50, 50);
ctx.rect(0, 75, 300, 75);
ctx.clip();
ctx.globalCompositeOperation = "destination-atop";
ctx.fillText("WORLD", 50, 120);
}
</script>
</head>
<body onload="test()">
<canvas id="c" width="300" height="150" style="-moz-osx-font-smoothing:grayscale"></canvas>
</body>
</html