<canvas width="600" height="400"></canvas>
<script>
var tela = document.querySelector("canvas");
var pincel = tela.getContext("2d");
pincel.fillStyle = "green";
pincel.fillRect(0, 0, 600, 400);
pincel.fillStyle = "yellow";
pincel.beginPath();
pincel.moveTo(50, 200);
pincel.lineTo(300, 350);
pincel.lineTo(550,200);
pincel. lineTo(300, 50);
pincel.fill();
pincel.fillStyle = "darkblue";
pincel.beginPath();
pincel.arc(300, 200, 100, 0, 2*3.14);
pincel.fill();
pincel.fillStyle = "white";
pincel.beginPath();
pincel.moveTo(200, 195);
pincel.lineTo(200, 205);
pincel.lineTo(400, 205);
pincel.lineTo(400, 195);
pincel.fill();
</script>
