<meta charset="UTF-8">
<canvas width="600" height="400"> </canvas>
<script>
var pantalla = document.querySelector("canvas");
var pincel = pantalla.getContext ("2d");
pincel.fillStyle = "black";
pincel.beginPath();
pincel.moveTo(50, 50);
pincel.lineTo(50, 400);
pincel.lineTo(400, 400);
pincel.fill();
pincel.fillStyle = "white";
pincel.beginPath();
pincel.moveTo(100,175);
pincel.lineTo(100, 350);
pincel.lineTo(275, 350);
pincel.fill();
