Bitmap canvas
<html> <head> <script type="application/x-javascript"> function draw() { var canvas = document.getElementById("canvas"); var ctx = canvas.getContext("2d"); ctx.fillStyle = "rgb(200,0,0)"; ctx.fillRect (10, 10, 55, 50); ctx.fillStyle = "rgba(0, 0, 200, 0.5)"; ctx.fillRect (30, 30, 55, 50); } </script> </head> <body onload="draw()"> <canvas id="canvas" width="300" height="300"></canvas> </body> </html>