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Test Info:

<!DOCTYPE HTML>
<canvas width="100" height="100" id="c" style="background: #f00"></canvas>
<script>
window.onload = function () {
var ctx = document.getElementById('c').getContext('2d');
ctx.globalCompositeOperation = 'lighter';
ctx.scale(5, 5);
ctx.strokeStyle = '#0f0';
ctx.lineWidth = 10;
ctx.strokeRect(5, 5, 10, 10);
}
</script>