<!DOCTYPE html>
<html>
<body>
<script src="../resources/runner.js"></script>
<script>

var source = document.createElement("canvas");
source.width = 300;
source.height = 150;
source.getContext("2d").fillStyle = 'rgba(0,128,0,0.5)';
source.getContext("2d").fillRect(0, 0, source.width, source.height);

var target = document.createElement("canvas");
target.width = source.width;
target.height = source.height;
var context = target.getContext("2d")
context.globalCompositeOperation = "destination-atop";

PerfTestRunner.measureRunsPerSecond({run: function() {
    context.drawImage(source, 0, 0);   
}});
</script>
</body>
</html>