Me gustó esta "nueva" función en JavaScript, Canvas, es divertida
<!DOCTYPE html>
<html lang="es">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Canvas / PT 1</title>
</head>
<body>
<canvas width="600" height="400"> </canvas>
<script>
var screen = document.querySelector("canvas");
var brush = screen.getContext("2d");
brush.fillStyle = "darkgreen"
brush.fillRect(0,0,800,600);
brush.fillStyle = "white"
brush.fillRect(200,0,200,400);
brush.fillStyle = "tomato"
brush.fillRect(400,0,200,400);
</script>
</body>
</html>