<html><head> <title>JavaScript Null and Undefined</title></head><body> <p id="status">Status: Not Defined</p> <button onclick="updateStatus()">Update Status</button> <script> let status = null; function updateStatus() { if (status === null) { status = "Active"; } else { status = null; } document.getElementById("status").textContent = "Status: " + (status || "Not Defined"); } </script></body></html>