title: Bootstrap button doesn't open
body: <p>I'm not able to figure out why my boostrap button doesn't open.</p>
  
  <p>I've seen previous questions with Jquery order being the issue, but I think this is not my problem here. Right?</p>
  
  <p>I'm following the examples from the bootstrap official website.</p>
  
  <p>Could someone help me please?</p>
  
  <p><strong>My code</strong></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;!-- Bootstrap CSS--&gt;
  &lt;link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css"&gt;
  &lt;!-- JQuery Library --&gt;
  &lt;script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"&gt;&lt;/script&gt;
  &lt;!-- Bootstrap Propper --&gt;
  &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js"&gt;&lt;/script&gt;
  
  &lt;!-- Bootstrap JS --&gt;
  &lt;script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js" integrity="sha384-alpBpkh1PFOepccYVYDB4do5UnbKysX5WZXm3XxPqe5iKTfUKjNkCk9SaVuEZflJ" crossorigin="anonymous"&gt;&lt;/script&gt;
  
  
  
  &lt;div class="container-fluid"&gt;
    &lt;hr id="hr-nav"&gt;
    &lt;nav class="navbar navbar-expand-lg navbar-dark bg-dark" role="navigation"&gt;
      &lt;a class="navbar-brand" href="#"&gt;T!&lt;/a&gt;
      &lt;button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#main-navbar" aria-controls="main-navbar" aria-expanded="false" aria-label="Toggle navigation"&gt;
                          &lt;span class="navbar-toggler-icon"&gt;&lt;/span&gt;
                      &lt;/button&gt;
      &lt;div class="collapse navbar-collapse" id="#main-navbar"&gt;
        &lt;ul class="navbar-nav navbar-center"&gt;
          &lt;li class="nav-item active"&gt;&lt;a class="nav-link" href="#"&gt;TEST1&lt;span class="sr-only"&gt;(current)&lt;/span&gt;&lt;/a&gt;&lt;/li&gt;
          &lt;li&gt;&lt;a class="nav-link" href="#"&gt;TEST2&lt;/a&gt;&lt;/li&gt;
          &lt;li&gt;&lt;a class="nav-link" href="#"&gt;TEST3&lt;/a&gt;&lt;/li&gt;
        &lt;/ul&gt;
      &lt;/div&gt;
    &lt;/nav&gt;
    &lt;hr id="hr-nav"&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>