title: Bootstrap 4 default tab-pane active fade in not working
body: <p>In the process of researching dynamic nav-tabs, I've decided to add a fade in effect when the user clicks on the tab of their choice.</p>
  
  <p>When the <strong>modal</strong> first loads, the following line of html makes the HOME tab appear by default.</p>
  
  <pre><code>&lt;div id="home" class="tab-pane active"&gt;
  </code></pre>
  
  <p>The above <strong>works fine but...</strong></p>
  
  <p>if I replace the above with the following html code...</p>
  
  <pre><code>&lt;div id="home" class="tab-pane active fade in"&gt;
  </code></pre>
  
  <p>When the <strong>modal</strong> first loads, div home <strong>is not faded in</strong>. It only works once the <strong>user clicks on a different tab and then back on HOME tab</strong>.</p>
  
  <p>My question is, is this behavior normal?</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;!-- 1. BOOTSTRAP v4.0.0         CSS !--&gt;
  &lt;link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous"&gt;
  &lt;!-- 2. GOOGLE JQUERY JS v3.2.1  JS !--&gt;
  &lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"&gt;&lt;/script&gt;
  &lt;!-- 3. BOOTSTRAP v4.0.0         JS !--&gt;
  &lt;script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"&gt;&lt;/script&gt;
  
  &lt;!-- Toggleable / Dynamic Tabs --&gt;
  
  &lt;nav class="nav nav-tabs nav-justified"&gt;
  &lt;a class="nav-item nav-link active" data-toggle="tab" href="#home"&gt;Home&lt;/a&gt;
  &lt;a class="nav-item nav-link" data-toggle="tab" href="#menu1"&gt;Menu 1&lt;/a&gt;
  &lt;a class="nav-item nav-link" data-toggle="tab" href="#menu2"&gt;Menu 2&lt;/a&gt;
  &lt;a class="nav-item nav-link disabled" data-toggle="tab" href="#menu3"&gt;Disabled&lt;/a&gt;
  &lt;/nav&gt;
  
  &lt;div class="tab-content"&gt;
  &lt;div id="home" class="tab-pane active fade in"&gt;
  &lt;h3&gt;HOME&lt;/h3&gt;
  &lt;p&gt;Some content in menu HOME.&lt;/p&gt;
  &lt;/div&gt;
  &lt;div id="menu1" class="tab-pane fade"&gt;
  &lt;h3&gt;Menu 1&lt;/h3&gt;
  &lt;p&gt;Some content in menu 1.&lt;/p&gt;
  &lt;/div&gt;
  &lt;div id="menu2" class="tab-pane fade"&gt;
  &lt;h3&gt;Menu 2&lt;/h3&gt;
  &lt;p&gt;Some content in menu 2.&lt;/p&gt;
  &lt;/div&gt;
  &lt;div id="menu3" class="tab-pane fade"&gt;
  &lt;h3&gt;Menu 3&lt;/h3&gt;
  &lt;p&gt;Some content in menu 3.&lt;/p&gt;
  &lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>