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<canvas width="600" height="400"></canvas>
<script>
var pantalla = document.querySelector("canvas");
var pincel = pantalla.getContext("2d");
pincel.fillStyle = "lightgrey";
pincel.fillRect(0,0,600,400);
pincel.fillStyle = "green";
pincel.fillRect(125,50,350,300);
pincel.fillStyle = "black";
pincel.fillRect(190,110,80,90);
pincel.fillStyle = "black";
pincel.fillRect(330,110,80,90);
pincel.fillStyle = "black";
pincel.fillRect(270,200,60,100);
pincel.fillStyle = "black";
pincel.fillRect(220,250,50,100);
pincel.fillStyle = "black";
pincel.fillRect(320,250,50,100);
</script>
</html>
