chat.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="jquery-3.7.1.min.js"></script>
    <script src="ajax.js"></script>
    <title>Chat</title>
</head>
<body>
    <div class='container mt-5'>
        <textarea class="form-control mb-3" rows="20" id="chat" readonly></textarea>
        <div class="row">
            <div class="col-3">
                <input type="text" id="name" placeholder="Jméno" class="form-control mb-3">
            </div>
            <div class="col">
                <input type="text" id="input" placeholder="Zpráva" class="form-control mb-3">
            </div>
        </div>
        <button class="btn btn-dark btn-sm" id="btn">Odeslat</button>
    </div>
    <script src="ajax.js"></script>
</body>
</html>