public/chart.html

<!DOCTYPE html>
<html lang="pt-br; en" id="home">
    <head>
        <title></title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">

        <meta name="msapplication-TileColor" content="#ffffff">
        <meta name="msapplication-TileImage" content="/ms-icon-144x144.png">
        <meta name="theme-color" content="#ffffff">

        <!-- jQuery -->
        <script src="assets/js/jquery-3.3.1.min.js"></script>
        <script src="assets/js/jquery-ui.js"></script>

        <!-- Popper -->
        <script src="assets/js/popper.min.js"></script>

        <!-- Bootstrap -->
        <link rel="stylesheet" href="assets/css/bootstrap.min.css">
        <script src="assets/js/bootstrap.js"></script>

        <!-- Font Awesome -->
        <link rel="stylesheet" href="assets/css/font-awesome.css">
        <script src="assets/js/7df7e1332b.js"></script>

        <!-- FONTS  -->
        <link href="https://fonts.googleapis.com/css?family=PT+Sans" rel="stylesheet">
        <link href="https://fonts.googleapis.com/css?family=Anton" rel="stylesheet">

        <!-- CSS -->
        <link rel="stylesheet" href="assets/css/jquery-ui.css">
        <link rel="stylesheet" href="assets/css/style.css">

        <!-- Google Chart Library -->
        <script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
    </head>

    <body id="body">
        <div id="chart_div"></div>
        <div id="a"></div>

        <script type="text/javascript" src="/assets/js/chart.js"></script>
    </body>
</html>