<canvas whith = "600" height="400"> </canvas>
<script type="text/javascript">
var pantalla = document.querySelector("canvas");
var pincel = pantalla.getContext("2d");
pincel.fillStyle = "darkGreen";
pincel.fillRect(0,0,350,300);
pincel.fillStyle = "Black";
pincel.fillRect(30,50,90,90);
pincel.fillStyle = "Black";
pincel.fillRect(190,50,90,90);
pincel.fillStyle = "Black";
pincel.fillRect(120,140,70,100); //horizontal - vertical - x - y
pincel.fillStyle = "Black";
pincel.fillRect(80,190,40,110); //horizontal - vertical - x - y
pincel.fillStyle = "Black";
pincel.fillRect(190,190,40,110); //horizontal - vertical - x - y
</script>
