Ejemplo
Vista Previa
<!doctype html> <html> <head> <title>Prueba de Bootstrap 4</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous"> </head> <body> <div class="container"> <ul class="nav mt-2"> <li class="nav-item"> <a class="nav-link" href="#">Opción 1</a> </li> <li class="nav-item"> <a class="nav-link active" href="#">Opción 2</a> </li> <li class="nav-item dropdown"> <a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#">Buscadores</a> <div class="dropdown-menu"> <a class="dropdown-item" href="http://www.google.com">Google</a> <a class="dropdown-item" href="http://www.bing.com">Bing</a> <a class="dropdown-item" href="http://www.yahoo.com">Yahoo</a> </div> </li> <li class="nav-item"> <a class="nav-link" href="#">Opción 4</a> </li> <li class="nav-item"> <a class="nav-link disabled" href="#">Opción 5</a> </li> </ul> </div> <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script> </body> </html>
No tiene disponible el navegador la capacidad de iframe