<canvas width="600" height="400"></canvas>
<script>
var tela= document.querySelector("canvas");
var pincel= tela.getContext("2d");
pincel.fillStyle="darkgreen";
pincel.fillRect(200,50,350,300);
pincel.fillStyle="black";
pincel.fillRect(250,90,100,90);
pincel.fillRect(400,90,100,90);
pincel.fillRect(340,180,70,100);
pincel.fillRect(300,240,40,110);
pincel.fillRect(410,240,40,110);
</script> 
