HTML:Ex:Getbootstrap.com/components/Dropdowns/Example (2)

 <button class="btn btn-default dropdown-toggle" type="button" 
     data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
   Dropup
   
 </button>

• <a href="#">Action</a>
• <a href="#">Another action</a>
• <a href="#">Something else here</a>
• <a href="#">Separated link</a>