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<!doctype html>
<html>
<head>
<style>
#canvas {
width: 300px;
height: 300px;
position: absolute;
left: 0px;
top: 0px;
}
#overlay {
width: 300px;
height: 300px;
position: absolute;
left: 0px;
top: 0px;
overflow: hidden;
}
#follower {
position: absolute;
left: 0px;
top: 0px;
width: 50px;
height: 50px;
background-color: #00FF00;
}
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<div id="overlay"><div id="follower"></div></div>
<script>
if (window.testRunner) {
testRunner.waitUntilDone();
}
var canvas = document.getElementById("canvas");
canvas.width = 300;
canvas.height = 300;
var ctx = canvas.getContext("2d");
ctx.fillStyle = "#FF0000";
var follower = document.getElementById("follower");
drawLoop = function() {
// draw the object
ctx.clearRect(0, 0, 300, 300);
ctx.fillRect(0, 0, 50, 50);
if (window.testRunner) {
testRunner.notifyDone();
}
};
window.setTimeout(drawLoop, 0);
</script>
</body>
</html>
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