<canvas width="600" height="400"> </canvas>
<script>
var pantalla = document.querySelector("canvas");
var pincel = pantalla.getContext("2d");
pincel.fillStyle = "darkgreen";
pincel.fillRect(120,35,350,330);
pincel.fillStyle = "black";
pincel.fillRect(180,110,90,90);
pincel.fillStyle = "black";
pincel.fillRect(320,110,90,90);
pincel.fillStyle = "black";
pincel.fillRect(260,200,70,100);
pincel.fillStyle = "black";
pincel.fillRect(220,255,40,110);
pincel.fillStyle = "black";
pincel.fillRect(330,255,40,110);
</script>