My nav code in Bootstrap doesn't work - html

The code at the and of this message I use in WebStorm. Have you any idea what I am doing wrong? Maybe some CDN errors or incorrect in the code?
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>DateLab</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js"></script>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js"></script>
</head>
<body>
<nav class="navbar navbar-inverse">
<div class="container-fluid">
<div class="navbar-header">
<a class="navbar-brand" href="#">DateLab</a>
</div>
<div>
<ul class="navbar navbar-nav">
<li class="active">Home</li>
<li>Hoe werkt het</li>
<li>Wie zijn wij</li>
<li>FAQ</li>
<li>Contact</li>
</ul>
</div>
</div>
</nav>
</body>
</html>
Situation output now:
Expected output:


I just changed you CDN links for sources. because you were using the Beta version of bootstrap. Also, there was some issue with HTML code I just replaced it.
check these useful links
https://v4-alpha.getbootstrap.com/
https://v4-alpha.getbootstrap.com/components/navbar/
Just be careful when you use any library and framework. try to use the stable versions. Also always include scripts at end of the code. because your code was generating some js errors.
<nav class="navbar navbar-toggleable-md navbar-light bg-faded">
<button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<a class="navbar-brand" href="#">Navbar</a>
<div class="collapse navbar-collapse" id="navbarNavDropdown">
<ul class="navbar-nav">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Hoe werkt het</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Wie zijn wij</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">FAQ</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Contact</a>
</li>
</ul>
</div>
</nav>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
<script src="https://npmcdn.com/tether#1.2.4/dist/js/tether.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"></script>

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Have you link bootstrap JS file ?
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There is nothing wrong with your html.
However, did you add js file (from bootstrap) to your html?

check this
<!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="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
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read http://getbootstrap.com/docs/4.0/getting-started/introduction/
you don't have all the necessary bootstrap files linked at the bottom of the page before the closng
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