<canvas width="600" height="400"></canvas>
<script>
var tela = document.querySelector("canvas");
var pincel = tela.getContext('2d');
pincel.fillStyle = 'lightgrey' ;
pincel.fillRect(0,0,600,400);
pincel.fillStyle = 'darkgreen' ;
pincel.fillRect(125,50,350,300);
pincel.fillStyle = 'black' ;
pincel.fillRect(175,100,90,90);
pincel.fillStyle = 'red' ;
pincel.fillRect(205,130,30,30);
pincel.fillStyle = 'black' ;
pincel.fillRect(335,100,90,90);
pincel.fillStyle = 'red' ;
pincel.fillRect(365,130,30,30);
pincel.fillStyle = 'black' ;
pincel.fillRect(265,190,70,100);
pincel.fillStyle = 'black' ;
pincel.fillRect(225,240,40,110);
pincel.fillStyle = 'black' ;
pincel.fillRect(335,240,40,110);
</script>
