<canvas width="600" height="400" ></canvas>
<script>
var pantalla=document.querySelector("canvas");
var pincel=pantalla.getContext("2d");
pincel.fillStyle="lightgrey";
pincel.fillRect(0,0,600,400);
pincel.fillStyle="darkgreen";
pincel.fillRect(100,50,350,300);
pincel.fillStyle="black";
pincel.fillRect(150,100,90,90);
pincel.fillRect(310,100,90,90);
pincel.fillRect(240,190,70,100);
pincel.fillRect(200,240,40,110);
pincel.fillRect(310,240,40,110);
</script>
