rendered paste body<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Canvas Trabalho 1</title> <style type="text/css"> canvas{ top:100px; left:100px; width:640px; position:absolute; border: black 1px double; height:480px; } </style> </head> <body> <canvas id="c1" width="640" height="480"> Este texto jamais aparecerá se o canvas funcionar. </canvas> <script type="text/javascript"> var canvas = document.getElementById("c1"); var ctx = canvas.getContext("2d"); //var timeout; function loop(){ ctx.clearRect(0,0,canvas.width,canvas.height); } /*timeout = */setInterval(loop,40); //document.onclick=function(evt){}; </script> </body></html>