javascript - Bootstrap 3 button dropdown displays list items -


i'm trying implement bootstrap button dropdown. followed directions docs:

<div class="btn-group">   <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">action <span class="caret"></span></button>   <ul class="dropdown-menu">     <li><a href="#">action</a></li>     <li><a href="#">another action</a></li>     <li><a href="#">something else here</a></li>     <li role="separator" class="divider"></li>     <li><a href="#">separated link</a></li>   </ul> </div>

the dropdown displays list items on page:

enter image description here

any ideas i'm doing wrong?

working fine when include boostrap files, may missed css 

<!doctype html>  <html lang="en">      <head>          <meta http-equiv="content-type" content="text/html; charset=utf-8">           <meta charset="utf-8">          <title>bootply snippet - bootply bootstrap preview</title>          <meta name="generator" content="bootply" />          <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">          <meta name="description" content="" />          <link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">          <!-- css code bootply.com editor -->             </head>            <!-- html code bootply.com editor -->            <body  >                    <div class="btn-group">  <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">action <span class="caret"></span></button>  <ul class="dropdown-menu">    <li><a href="#">action</a></li>    <li><a href="#">another action</a></li>    <li><a href="#">something else here</a></li>    <li role="separator" class="divider"></li>    <li><a href="#">separated link</a></li>  </ul></div>                    <script type='text/javascript' src="//ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>              <script type='text/javascript' src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>        </body>  </html>


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