<canvas width="600" height="400"></canvas>
<script>
var pantalla = document.querySelector("canvas");
var pincel = pantalla.getContext("2d");
pincel.fillStyle = "#cccccc"
pincel.fillRect(0, 0, 600, 400);
pincel.fillStyle = "darkgreen"
pincel.fillRect(120, 40, 350, 300);
pincel.fillStyle = "#111111"
pincel.fillRect(170, 90, 90, 90);
pincel.fillRect(330, 90, 90, 90);
pincel.fillRect(260, 180, 70, 100);
pincel.fillRect(260, 340, -40, -100);
pincel.fillRect(370, 340, -40, -100);
</script>
