presence-firestore/public/index.html

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<html> 
    <head>
        <title>Presence in Firestore</title>
    </head>
    <body>
        <h3>History of user presence (since this page was opened)</h3>
        <div id="history">

        </div>
        <!-- Import and configure the Firebase SDK -->
        <!-- These scripts are made available when the app is served or deployed on Firebase Hosting -->
        <!-- If you do not serve/host your project using Firebase Hosting see https://firebase.google.com/docs/web/setup -->
        <script src="/__/firebase/8.4.1/firebase-app.js"></script>
        <script src="/__/firebase/8.4.1/firebase-auth.js"></script>
        <script src="/__/firebase/8.4.1/firebase-database.js"></script>
        <script src="/__/firebase/8.4.1/firebase-firestore.js"></script>
   
        <script src="/__/firebase/init.js"></script>

        <script src="./index.js"></script>
    </body>
</html>