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<!DOCTYPE html>

<head>

body {

background-color: transparent;

}

h1 {

margin: 5px;

padding: 5px;

color: black;

background-color: lime;

}

</style>

</head>

<body>

<h1 id="h1">Loading...</h1>

var frames = 0;

var lastTimestamp;

function step (timestamp) {

frames++;

if (lastTimestamp) {

var fps = 1000 / (timestamp - lastTimestamp);

document.getElementById("h1").innerHTML = 'frames: ' + frames;

document.getElementById("h2").innerHTML = 'fps: ' + fps.toFixed(2);

}

lastTimestamp = timestamp;

window.requestAnimationFrame(step);

};

window.requestAnimationFrame(step);

</script>

</body>

</html>