title: Glyphicon not working in bootstrap version 4.1 and later
body: <p>I tried to show a <strong>search icon</strong> in form but the only button is shown without the glyphs.</p>
  
  <pre><code>&lt;form class="form-inline my-2 my-lg-0"&gt;
      &lt;input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search"&gt;
      &lt;button class="btn btn-outline-success my-2 my-sm-0" type="submit"&gt;&lt;span class="glyphicon glyphicon-search"&gt;&lt;/span&gt;&lt;/button&gt;
  &lt;/form&gt;  
  </code></pre>
  
  <p><strong>RESULT</strong>
  <a href="https://i.stack.imgur.com/4Az7R.png" rel="noreferrer"><img src="https://i.stack.imgur.com/4Az7R.png" alt="enter image description here"></a></p>
  
  <p>I use bootstrap version 4.1. I got the glyphicon code <a href="https://getbootstrap.com/docs/3.3/components/#glyphicons-how-to-use" rel="noreferrer">getbootstrap.com</a> and form <a href="https://getbootstrap.com/docs/4.0/components/navbar/#supported-content" rel="noreferrer">getbootstrap.com</a></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;script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"&gt;&lt;/script&gt;
  &lt;script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"&gt;&lt;/script&gt;
  &lt;script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"&gt;&lt;/script&gt;
  &lt;link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css" rel="stylesheet" /&gt;
  
  &lt;form class="form-inline my-2 my-lg-0"&gt;
    &lt;input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search"&gt;
    &lt;button class="btn btn-outline-success my-2 my-sm-0" type="submit"&gt;&lt;span class="glyphicon glyphicon-search"&gt;&lt;/span&gt;&lt;/button&gt;
  &lt;/form&gt;</code></pre>
  </div>
  </div>
  </p>