index.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Stats</title>
    <style type="text/css">
        #progress {
            background-color: black;
            color: white;
            white-space: pre-wrap;
            overflow-wrap: anywhere;
            font-family: monospace;
            width: 100%;
            height: 70vh;
            overflow-y: auto;
        }
    </style>
</head>

<body>
    <h1>Basic Stats</h1>

    <div id="progress"></div>

    <script type="text/javascript">
        const interval = 1000;
        const progress = document.getElementById('progress');
        let timeout;

        function updateProgress() {
            fetch('/progress.txt')
                .then(response => response.text())
                .then(text => progress.textContent = text)
                .then(() => {
                    // scroll to bottom of #progress
                    progress.scrollTop = progress.scrollHeight;

                    if (timeout) clearTimeout(timeout);
                    timeout = setTimeout(updateProgress, interval);
                })
                .catch(error => {
                    console.error(error);
                    if (timeout) clearTimeout(timeout);
                    timeout = setTimeout(updateProgress, interval);
                });
        }
        updateProgress();
    </script>
</body>

</html>