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<!DOCTYPE html> <html lang="en"> <head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="/lib/bootstrap.min.css"> <script src="/lib/jquery-1.12.2.min.js"></script> <script src="/lib/bootstrap.min.js"></script> </head> <body> <div class="container"> <h2>Nesting Button Groups</h2> <p>Nest button groups to create drop down menus:</p> <div class="btn-group"> <button type="button" class="btn btn-primary">Apple</button> <button type="button" class="btn btn-primary">Samsung</button> <div class="btn-group"> <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown"> Sony <span class="caret"></span></button> <ul class="dropdown-menu" role="menu"> <li><a href="#">Tablet</a></li> <li><a href="#">Smartphone</a></li> </ul> </div> </div> </div> </body> </html>