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<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
for (let i = 0; i < 50; i++) {
canvas.width = 20;
ctx.fillStyle = 'green';
ctx.fillRect(1, 1, 20, 20);
canvas.width = 10;
ctx.fillStyle = 'green';
ctx.fillRect(1, 1, 10, 10);
}
}
</script>
</head>
<body onload="boom();">
<canvas id="canvas"></canvas>
</body>
</html>
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