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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<script>
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function boom()
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{
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var canvas = document.createElement('canvas');
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var ctx = canvas.getContext('2d');
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ctx.setLineDash([-1]);
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ctx.isPointInStroke(0, 0);
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}
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</script>
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</head>
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<body onload="boom();"></body>
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</html>
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