<body>
<canvas width="600" height="400"></canvas>
<script>
var pantalla = document.querySelector('canvas');
var pincel = pantalla.getContext('2d');
pincel.fillStyle = 'darkgreen';
pincel.fillRect(200,50,350,300);
pincel.fillStyle='black';
pincel.fillRect(250,110,90,90);
pincel.fillRect(410,110,90,90);
pincel.fillRect(340, 200, 70, 100);
pincel.fillRect(300, 240, 40, 110);
pincel.fillRect(410, 240, 40, 110);
pincel.beginPath();
pincel.moveTo(10,10);
pincel.lineTo(10,190);
pincel.lineTo(190,190);
pincel.fill();
pincel.fillStyle='white'
pincel.beginPath();
pincel.moveTo(30,55);
pincel.lineTo(30,170);
pincel.lineTo(150,170),
pincel.fill();
</script>
