<!doctype html> <head> <style> body { background-color: blue; } </style> <body> <canvas id="mycanvas" width="200" height="200"></canvas> <script type="text/javascript"> var cx = document.getElementById('mycanvas').getContext('2d'); cx.beginPath(); cx.arc(100, 100, 80, 0, Math.PI*2, true); cx.closePath(); cx.fillStyle = "white"; cx.fill(); </script>
