Edit This Code:
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<style>
canvas {
    border: 1px solid #d3d3d3;
    background-color: #f1f1f1;
}

</style>
</head>
<body onload="startGame()">
<script>

function startGame() {
    myGameArea.start();
}

var myGameArea = {
    canvas : document.createElement("canvas"),
    start : function() {
        this.canvas.width = 480;
        this.canvas.height = 270;
        this.context = this.canvas.getContext("2d");
        document.body.insertBefore(this.canvas, document.body.childNodes[0]);
    }
}

</script>

<p>We have created a game area! (or at least an empty canvas)</p>

</body>
</html>


Result:
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