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<canvas id="dest" height="100" width="100"></canvas>
<script>
var canvasWidth = canvasHeight = 100;
var destCanvas = document.getElementById('dest');
var destCtx = destCanvas.getContext('2d');
destCtx.fillStyle = 'red';
destCtx.fillRect(0, 0, canvasWidth, canvasHeight);
destCtx.fillStyle = 'green';
destCtx.fillRect(0, 0, canvasWidth / 2, canvasHeight / 2);
destCtx.fillRect(canvasWidth / 2, canvasHeight / 2, canvasWidth / 4, canvasHeight / 4);
</script>
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