<canvas width="600" height="400"> </canvas>
<script>
var tela = document.querySelector('canvas');
var pincel = tela.getContext('2d');
pincel.fillStyle = 'darkgreen';
pincel.fillRect(125,50,350,300);
pincel.fillStyle = 'black';
pincel.fillRect(170,100,90,90);
pincel.fillRect(340,100,90,90);
pincel.fillRect(260,190,80,100);
pincel.fillRect(220,240,40,110);
pincel.fillRect(340,240,40,110);
</script>
