<!DOCTYPE html> <html> <head> <script> function boom() { var ctx = canvas.getContext('2d'); ctx.rect(2, 6, 9, 8); ctx.setTransform(1, 2, 3, 0, 4, 1); setTimeout(function() { ctx.moveTo(0, 1); ctx.isPointInPath(0, 0, 'evenodd'); }, 0); } </script> </head> <body onload="boom();"> <canvas id="canvas"></canvas> </body> </html>