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<html> <script language=javascript> function draw() { var canv = document.getElementById("canv"); var ctx = canv.getContext("2d"); try { canv.width = 50000; } catch (e) { } ctx.clearRect(0, 0, 10, 10); } </script> <body onload="draw()"> <canvas id="canv" width="5" height="5"></canvas> </body> </html>