I basically copied the components of a Pills dropdown menu from <http://getbootstrap.com/components/> but it simply won't work. When I click the menu item, the dropdown just doesn't appear. I copied my exact code into a JSFiddle: <https://jsfiddle.net/j63f0o2f/>. Snippet from the JSFiddle:

```
<div class="nav">
    <ul class="nav nav-pills nav-justified">
        <li><a href="#">Robot Technology</a></li>
        <li class="dropdown"><a href="#" class="dropdown-toggle" data-toggle="dropdown">Webdesign <span class="caret"></span></a>
            <ul class="dropdown-menu" role="menu">
                <li><a href="#">HTML 5</a></li>
                <li><a href="#">CSS 3</a></li>
                <li><a href="#">Bootstrap 5</a></li>
            </ul>
        </li>

```