utton id="sign-in-with-popup">Sign In with Popup</button>
            </p>
            <div id="firebaseui-spa">
              <h5>Single Page Application mode:</h5>
              <div id="firebaseui-container"></div>
            </div>
          </div>
        </div>
      </div>
    </div>
    <script src="app.js"></script>
  </body>
</html>
