<canvas width="600" height="400">
</canvas>
<script>
var pantalla = document.querySelector("canvas");
var pincel = pantalla.getContext("2d");
pincel.fillStyle = "pink";
pincel.fillRect(0,0,600,400);
pincel.fillStyle = "black";
pincel.fillRect(0,0,300,400);
pincel.fillStyle = "white";
pincel.beginPath();
pincel.moveTo(0,50);
pincel.lineTo(150,400);
pincel.lineTo(200,400);
pincel.fill();
pincel.fillStyle = "white";
pincel.beginPath();
pincel.moveTo(200,400);
pincel.lineTo(300,400);
pincel.lineTo(300,300);
pincel.fill();
pincel.fillStyle = "black";
pincel.beginPath();
pincel.moveTo(300,300);
pincel.lineTo(300,400);
pincel.lineTo(600,50);
pincel.fill();
pincel.fillStyle = "white";
pincel.beginPath();
pincel.arc(450,200,50,0,2*3.14);
pincel.fill();
</script>