Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var canvas = document.createElement("canvas");
    canvas.width = canvas.height = 256;
    var ctx = canvas.getContext("2d");
    ctx.save(); //save the first status
  };
</script>

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canvas.width = 256;
ctx = canvas.getContext("2d"); //canvas size changed, get new context

ctx.restore();
ctx.save();
ctx.clearRect(0, 0, 256, 256);

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