public/chart.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>ac-learn charts</title>
</head>
<body>
    <canvas id="labels" width="400" height="400"></canvas>
    <script src="https://cdn.jsdelivr.net/npm/chart.js@2.8.0/dist/Chart.min.js" type="text/javascript"></script>
    <script src="chart.js"></script>
</body>
</html>