javascript canvas class #1

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        canvas {
            border: 2px solid black;
        }
    </style>
</head>

<body>


    <canvas id="myCanvas" width="600" height="600"></canvas>
    <script>


        var c = document.getElementById("myCanvas");
        var ctx = c.getContext("2d");
        ctx.beginPath();
        ctx.lineWidth = 10;
        ctx.strokeStyle = "#FF0000";
        ctx.rect(20, 20, 150, 100);
        ctx.stroke();


        ctx.lineWidth = 5;
        ctx.beginPath();
        ctx.arc(70, 70, 30, 0, Math.PI * 2);
        ctx.fillStyle = "red";
        ctx.stroke();

        ctx.lineWidth = 15;
        ctx.beginPath();
        ctx.moveTo(0, 0);
        ctx.lineTo(300, 150);
        ctx.stroke();


        ctx.font = "30px Arial";
        ctx.fillText("Hello World", 350, 150);

    </script>





</body>

</html>