How can I create a collapsing navigation bar that scrolls with the page using navbar-fixed-top in Bootstrap 4?
<!DOCTYPE html>
<html lang="en>">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.2.0/js/tether.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-alpha.3/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.3/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container-fluid">
<nav class="navbar navbar-fixed-top navbar-light bg-faded">
<div class="container">
<a class="navbar-brand" href="#">Fixed top</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#exCollapsingNavbar" aria-controls="exCollapsingNavbar" aria-expanded="false" aria-label="Toggle navigation">☰</button>
<div class="collapse" id="exCollapsingNavbar">
<div class="p-a-1">
<ul class="nav navbar-nav nav-pills nav-stacked">
<li class="nav-item">
<a class="nav-link active" href="#">Active</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<!-- More list items -->
</ul>
</div>
</div>
</div>
</nav>
</div>
</body>
</html>