<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet"
href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<nav class="navbar navbar-inverse">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle"
data-toggle="collapse" data-target="#Navbar-id">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">YourWebSiteName</a>
</div>
<div class="collapse navbar-collapse" id="Navbar-id">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Home</a></li>
<li class="dropdown">
<a class="dropdown-toggle" data-toggle="dropdown"
href="#">Web <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">PHP</a></li>
<li><a href="#">JavaScript</a></li>
<li><a href="#">HTML</a></li>
<li><a href="#">CSS</a></li>
</ul>
</li>
<li><a href="#">Java</a></li>
<li><a href="#">C#</a></li>
<li><a href="#">C++</a></li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="#"><span class="glyphicon glyphicon-user"></span> Sign Up</a></li>
<li><a href="#"><span class="glyphicon glyphicon-log-in"></span> Login</a></li>
</ul>
</div>
</div>
</nav>
<div class="container">
<h3>Bootstrap collapsible navigation bar</h3>
<p>re-size the browser to small size, and click on three lines button,
on the top right side</p>
</div>
</body>
</html>
