Live Demo: Drawing a Rectangle on the Canvas

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Drawing a Rectangle on the Canvas</title>
<style>
    canvas {
        border: 1px solid #000;
    }
</style>
<script>
    window.onload = function() {
        var canvas = document.getElementById("myCanvas");
        var context = canvas.getContext("2d");
        context.rect(50, 50, 200, 100); 
        context.stroke();
    };
</script>
</head>
<body>
    <canvas id="myCanvas" width="300" height="200"></canvas>
</body>
</html>