snake/index.html

<html>
    <head>
        <title>Snake Game</title>
        <style>
            canvas{
                display: block;
                margin: 0 auto;
            }
        </style>
    </head>

    <div id="Start button">
        <button onclick="functionToExec()">Start Game</button> 
    </div>
    <div id="Quit">
        <button onclick="location.reload();;"> Quit </button>
    </div>

    <script>document.getElementById("Quit").innerHTML="";</script>

    <canvas id="snake" width="608" height="608"></canvas>
    <script type="text/javascript">
        function functionToExec() {
            var script = document.createElement("script");
            script.type = "text/javascript";
            script.src = "snake.js"; 
            document.getElementsByTagName("head")[0].appendChild(script);
            document.getElementById("Start button").innerHTML="";
            document.getElementById("Quit").innerHTML= '<button onclick="location.reload();;"> Quit </button>';
        }
    </script>
</html>