test_page.html

<!DOCTYPE html>
<html>
<head>
    <title>Dynamic Buttons and Pop-up</title>
    <style>
        #button2 {
            display: none;
        }

        #popup {
            display: none;
            position: fixed;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
            border: 1px solid #000;
            background-color: white;
            padding: 10px;
            box-shadow: 0px 0px 10px rgba(0,0,0,0.5);
        }
    </style>
</head>
<body>
    <button id="button1" onclick="showButton()">Click Me</button>
    <button id="button2" onclick="showPopup()">Button 2</button>
    <div id="popup">This is a pop-up!</div>

    <script>
        function showButton() {
            document.getElementById("button2").style.display = "block";
        }

        function showPopup() {
            var popup = document.getElementById("popup");
            popup.style.display = "block";
            setTimeout(function() {
                popup.style.display = "none";
            }, 1000);
        }
    </script>
</body>
</html>