<!DOCTYPE html>
<html>

    <head>
        <meta charset="UTF-8">
        <title>My Portfolio</title>
        <link rel="stylesheet" href="style.css">

        <!-- The core Firebase JS SDK is always required and must be listed first -->
        <script src="https://www.gstatic.com/firebasejs/7.15.4/firebase-app.js"></script>

        <!-- TODO: Add SDKs for Firebase products that you want to use
            https://firebase.google.com/docs/web/setup#available-libraries -->
        <script src="https://www.gstatic.com/firebasejs/7.15.4/firebase-analytics.js"></script>
        <script src="https://www.gstatic.com/firebasejs/7.15.4/firebase-database.js"></script>

        <script>
        // Your web app's Firebase configuration
        var firebaseConfig = {};

        // Initialize Firebase
        firebase.initializeApp(firebaseConfig);
        firebase.analytics();
        </script>
        <script src="script.js"></script>
    </head>

    <body onload="init()">
        <div id="content"></div>
    </body>

</html>

<!DOCTYPE html>
<html>

    <head>
        <meta charset="UTF-8">
        <title>My Portfolio</title>
        <link rel="stylesheet" href="style.css">

        <!-- The core Firebase JS SDK is always required and must be listed first -->
        <script src="https://www.gstatic.com/firebasejs/7.15.4/firebase-app.js"></script>

        <!-- TODO: Add SDKs for Firebase products that you want to use
            https://firebase.google.com/docs/web/setup#available-libraries -->
        <script src="https://www.gstatic.com/firebasejs/7.15.4/firebase-analytics.js"></script>
        <script src="https://www.gstatic.com/firebasejs/7.15.4/firebase-database.js"></script>

        <script>
        // Your web app's Firebase configuration
        var firebaseConfig = {};

        // Initialize Firebase
        firebase.initializeApp(firebaseConfig);
        firebase.analytics();
        </script>
        <script src="script.js"></script>
    </head>

    <body onload="init()">
        <div id="content"></div>
        <form>
            <input type="text" id="message-input" />
            <button type="submit">send</button>
        </form>
    </body>

</html>

Add a message form to the HTML.
Add a message form to the HTML.
