title: Bootstrap 4 input-group-append not working
body: <p>Using the following HTML:</p>
  
  <pre><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, shrink-to-fit=no"&gt;
      &lt;meta name="description" content=""&gt;
      &lt;meta name="author" content=""&gt;
      &lt;link rel="icon" href="../../../../favicon.ico"&gt;
  
      &lt;title&gt;Starter Template for Bootstrap&lt;/title&gt;
  
      &lt;!-- Bootstrap core CSS --&gt;
      &lt;link
        rel="stylesheet"
        href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css"
        integrity="sha384-PsH8R72JQ3SOdhVi3uxftmaW6Vc51MKb0q5P2rRUpPvrszuE4W1povHYgTpBfshb"
        crossorigin="anonymous"&gt;
  
  
      &lt;!-- jQuery libraries --&gt;
      &lt;script
        src="https://code.jquery.com/jquery-3.2.1.min.js"
        integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4="
        crossorigin="anonymous"&gt;&lt;/script&gt;
      &lt;script
        src="https://code.jquery.com/ui/1.12.1/jquery-ui.min.js"
        integrity="sha256-VazP97ZCwtekAsvgPBSUwPFKdrwD3unUfSGVYrahUqU="
        crossorigin="anonymous"&gt;&lt;/script&gt;
  
      &lt;!-- Custom styles --&gt;
      &lt;link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css"&gt;
  
    &lt;/head&gt;
  
    &lt;body&gt;
  
      &lt;nav class="navbar navbar-expand-md navbar-dark bg-dark fixed-top"&gt;
        &lt;a class="navbar-brand" href="#"&gt;Navbar&lt;/a&gt;
        &lt;button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault" aria-controls="navbarsExampleDefault" 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="navbarsExampleDefault"&gt;
          &lt;ul class="navbar-nav mr-auto"&gt;
            &lt;li class="nav-item active"&gt;
              &lt;a class="nav-link" href="#"&gt;Home &lt;span class="sr-only"&gt;(current)&lt;/span&gt;&lt;/a&gt;
            &lt;/li&gt;
            &lt;li class="nav-item"&gt;
              &lt;a class="nav-link" href="#"&gt;Link&lt;/a&gt;
            &lt;/li&gt;
            &lt;li class="nav-item"&gt;
              &lt;a class="nav-link disabled" href="#"&gt;Disabled&lt;/a&gt;
            &lt;/li&gt;
            &lt;li class="nav-item dropdown"&gt;
              &lt;a class="nav-link dropdown-toggle" href="http://example.com" id="dropdown01" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"&gt;Dropdown&lt;/a&gt;
              &lt;div class="dropdown-menu" aria-labelledby="dropdown01"&gt;
                &lt;a class="dropdown-item" href="#"&gt;Action&lt;/a&gt;
                &lt;a class="dropdown-item" href="#"&gt;Another action&lt;/a&gt;
                &lt;a class="dropdown-item" href="#"&gt;Something else here&lt;/a&gt;
              &lt;/div&gt;
            &lt;/li&gt;
          &lt;/ul&gt;
          &lt;form class="form-inline my-2 my-lg-0"&gt;
            &lt;input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search"&gt;
            &lt;button class="btn btn-outline-success my-2 my-sm-0" type="submit"&gt;Search&lt;/button&gt;
          &lt;/form&gt;
        &lt;/div&gt;
      &lt;/nav&gt;
  
      &lt;main role="main" class="container"&gt;
  
      &lt;div class="input-group mb-3"&gt;
        &lt;div class="input-group-prepend"&gt;
          &lt;span class="input-group-text" id="basic-addon1"&gt;@&lt;/span&gt;
        &lt;/div&gt;
        &lt;input type="text" class="form-control" placeholder="Username" aria-label="Username" aria-describedby="basic-addon1"&gt;
      &lt;/div&gt;
  
      &lt;div class="input-group mb-3"&gt;
        &lt;input type="text" class="form-control" placeholder="Recipient's username" aria-label="Recipient's username" aria-describedby="basic-addon2"&gt;
        &lt;div class="input-group-append"&gt;
          &lt;span class="input-group-text" id="basic-addon2"&gt;@example.com&lt;/span&gt;
        &lt;/div&gt;
      &lt;/div&gt;
  
      &lt;label for="basic-url"&gt;Your vanity URL&lt;/label&gt;
      &lt;div class="input-group mb-3"&gt;
        &lt;div class="input-group-prepend"&gt;
          &lt;span class="input-group-text" id="basic-addon3"&gt;https://example.com/users/&lt;/span&gt;
        &lt;/div&gt;
        &lt;input type="text" class="form-control" id="basic-url" aria-describedby="basic-addon3"&gt;
      &lt;/div&gt;
  
      &lt;div class="input-group mb-3"&gt;
        &lt;div class="input-group-prepend"&gt;
          &lt;span class="input-group-text"&gt;$&lt;/span&gt;
        &lt;/div&gt;
        &lt;input type="text" class="form-control" aria-label="Amount (to the nearest dollar)"&gt;
        &lt;div class="input-group-append"&gt;
          &lt;span class="input-group-text"&gt;.00&lt;/span&gt;
        &lt;/div&gt;
      &lt;/div&gt;
  
      &lt;/main&gt;&lt;!-- /.container --&gt;
  
      &lt;!-- Bootstrap core JavaScript
      ================================================== --&gt;
      &lt;!-- Placed at the end of the document so the pages load faster --&gt;
      &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js" integrity="sha384-vFJXuSJphROIrBnz7yo7oB41mKfc8JzQZiCq4NCceLEaO4IHwicKwpJf9c9IpFgh" crossorigin="anonymous"&gt;&lt;/script&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;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>However, when I actually render the page, the <code>input-group-append</code> section doesn't seem to work. Here's a screenshot:</p>
  
  <p><a href="https://i.stack.imgur.com/KHSkL.png" rel="noreferrer"><img src="https://i.stack.imgur.com/KHSkL.png" alt="Rendered page screenshot"></a></p>
  
  <p>However, this clearly doesn't look like the examples <a href="https://getbootstrap.com/docs/4.0/components/input-group/" rel="noreferrer">here</a>.</p>
  
  <p>Not sure what I should be doing differently here, is this a bug with the Bootstrap 4.0 Beta? </p>
  
  <p>Quick additional note, in case it's relevant somehow, I'm using Django 2.0.</p>