title: My nav code in Bootstrap doesn't work
body: <p>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?</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code> &lt;!DOCTYPE html&gt;
      &lt;html lang="en"&gt;
      &lt;head&gt;
          &lt;meta charset="UTF-8"&gt;
          &lt;meta name="viewport" content="width=device-width, initial-scale=1"&gt;
          &lt;title&gt;DateLab&lt;/title&gt;
          &lt;link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css"&gt;
          &lt;script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js"&gt;&lt;/script&gt;
          &lt;script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"&gt;&lt;/script&gt;
          &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js"&gt;&lt;/script&gt;
      &lt;/head&gt;
      &lt;body&gt;
          &lt;nav class="navbar navbar-inverse"&gt;
              &lt;div class="container-fluid"&gt;
      
                  &lt;div class="navbar-header"&gt;
                      &lt;a class="navbar-brand" href="#"&gt;DateLab&lt;/a&gt;
                  &lt;/div&gt;
                  &lt;div&gt;
                      &lt;ul class="navbar navbar-nav"&gt;
                          &lt;li class="active"&gt;&lt;a href="#"&gt;Home&lt;/a&gt;&lt;/li&gt;
                          &lt;li&gt;&lt;a href="#"&gt;Hoe werkt het&lt;/a&gt;&lt;/li&gt;
                          &lt;li&gt;&lt;a href="#"&gt;Wie zijn wij&lt;/a&gt;&lt;/li&gt;
                          &lt;li&gt;&lt;a href="#"&gt;FAQ&lt;/a&gt;&lt;/li&gt;
                          &lt;li&gt;&lt;a href="#"&gt;Contact&lt;/a&gt;&lt;/li&gt;
                      &lt;/ul&gt;
                  &lt;/div&gt;
              &lt;/div&gt;
          &lt;/nav&gt;
      &lt;/body&gt;
      &lt;/html&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>Situation output now: 
  <img src="https://i.stack.imgur.com/2XnKf.png" alt="enter image description here"></p>
  
  <p>Expected output:
  <img src="https://i.stack.imgur.com/56qtX.png" alt="enter image description here"></p>