javascript - Bootstrap navbar toggle not rendering -


i building website using bootstrap , have gotten stock on implementation part. i've checked , appears i've installed bootstrap , jquery correctly, when go toggle dropdown menu on mobile sized screen nothing happens. understand has been asked before , have tried resolve issue solutions nothing helped.

<!doctype html> <html lang="en">  <head>      <meta charset="utf-8">      <title>portfolio</title>      <meta name="viewport" content="width=device-width, initial-scale=1">      <!-- latest compiled , minified css -->     <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha384-1q8mtjoasx8j1au+a5wdvnpi2lkffwweaa8hdddjzlplegxhjvme1fgjwpgmkzs7" crossorigin="anonymous"> </head>  <body>     <div class="navbar navbar-default navbar-fixed-top" role="navigation">         <div class="container">         <!--- brand , toggle grouped better mobile display -->             <div class="navbar-header">                 <a class="navbar-brand" href="./index.html">test</a>                 <button type="button" class="navbar-toggle" data-toggle="collapse" datatarget=".navbar-collapse">                     <span class="sr-only"> toggle navigation</span>                     <span class="icon-bar"></span>                     <span class="icon-bar"></span>                     <span class="icon-bar"></span>                 </button>             </div>             <!-- links -->             <div class="collapse navbar-collapse">                 <ul class="nav navbar-nav navbar-right">                     <li><a href="#">about</a></li>                     <li><a href="#">portfolio</a></li>                     <li><a href="#">contact</a></li>                 </ul>             </div>         </div>       </div>                    <!-- body content below -->       <div class="container">         <div class="row">             <div class="col-md-4" id="#">                 <h1> test</h1>                </div>         </div>     </div>  <!-- jquery library --> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script> <!-- latest compiled , minified javascript --> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js" integrity="sha256-kxn5pumvxcw+dayznun+drmdg1ifl3agk0p/pqt9kao= sha512-2e8qq0etcfwri4hjbzqia3uoyfk6tbnyg+qsaibzlyw9xf3swzhn/lxe9fth1u45dppf07yj94ksuhhwe4yk1a==" crossorigin="anonymous"></script>     </body> </html>

try this:

<nav class='navbar-default navbar' > <div class="navbar-header">   <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">     <span class="sr-only">toggle navigation</span>     <span class="icon-bar"></span>     <span class="icon-bar"></span>     <span class="icon-bar"></span>   </button>   <a class="navbar-brand" href="#">brand</a> </div> </nav>

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