<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Security-Policy" content="default-src 'self' data: gap: https://ssl.gstatic.com 'unsafe-eval'; style-src 'self' 'unsafe-inline'; media-src *">
        <meta name="format-detection" content="telephone=no">
        <meta name="msapplication-tap-highlight" content="no">
        <meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width">
        <link rel="stylesheet" href="css/fonts/material-icons.css">
        <link rel="stylesheet" href="css/Roboto/roboto.css">
        <style>
            * {
                font-family:"Roboto",sans-serif;
            }
        </style>
        <title>Hello World</title>
    </head>
    <body>
        <div id="app"></div>
        <script type="text/javascript" src="js/main.js"></script>
    </body>
</html>

<!DOCTYPE html>
<html>
    <head>
        <meta name="format-detection" content="telephone=no">
        <meta name="msapplication-tap-highlight" content="no">
        <meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width">
        <link rel="stylesheet" href="css/fonts/material-icons.css">
        <link rel="stylesheet" href="css/Roboto/roboto.css">
        <style>
            * {
                font-family:"Roboto",sans-serif;
            }
        </style>
        <title>Hello World</title>
    </head>
    <body>
        <div id="app"></div>
        <script src="https://maps.googleapis.com/maps/api/js"></script>
        <script type="text/javascript" src="js/main.js"></script>
    </body>
</html>

Add google map javascript api sdk
Add google map javascript api sdk
