title: Dropdown menu popper.js
body: <p>I'm trying to make a dropdown menu but I get this error:</p>
  
  <pre><code>"Uncaught Error: Bootstrap dropdown require Popper.js (https://popper.js.org)
      at bootstrap.min.js:6
      at bootstrap.min.js:6
      at bootstrap.min.js:6"
  </code></pre>
  
  <p>I found some questions about it  here but none of them worked for me. How do I import this popper.js? </p>
  
  <p>edit1: </p>
  
  <p>I just found a way to import with script tag...it was all this time in bootstrap documentation. But, there's one more problem: The code is free of erros but my dropdown button isn't working. I tried every single dropdown in bootstrap documentation, I ctrl+c - ctrl-v all of them and none of them are working, I click on the button and nothing happens :(</p>
  
  <pre><code> !doctype html&gt;
  &lt;html&gt;
  &lt;head&gt;
  &lt;meta charset="utf-8"&gt;
  &lt;title&gt;About us&lt;/title&gt;
  
  
  &lt;link href="bootstrap.min.css" rel="stylesheet" type="text/css"&gt;
  
  
  &lt;link href="Sobre-Nós.css" rel="stylesheet" type="text/css"&gt;
  
  
  
  
  
  &lt;script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"&gt;&lt;/script&gt;
  
  &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js" integrity="sha384-b/U6ypiBEHpOf/4+1nzFpr53nxSS+GLCkfwBdFNTxtclqqenISfwAzpKaMNFNmj4" crossorigin="anonymous"&gt;&lt;/script&gt;
  
  
  
  
  
  
  
  &lt;/head&gt;
  </code></pre>