<!DOCTYPE html>
<html lang="en">
<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</title>
</head>
<body>
<canvas width="600" height="400" id="canvas"></canvas>
<script>
var pant = document.querySelector("canvas");
var pincel = pant.getContext("2d");
pincel.fillStyle = "lightgrey";
pincel.fillRect(0, 0, 600, 400);
pincel.fillStyle = "green";
pincel.fillRect(0, 0, 200, 400);
pincel.fillStyle = "red";
pincel.fillRect(400, 0, 400, 600);
</script>
</body>
</html>
