<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="container">
<div class="row">
<h1>What Can JavaScript Do?</h1>
<p id="demo">JavaScript can change HTML content.</p>
<button type="button"
onclick="document.getElementById('demo').innerHTML = 'Hello JavaScript!'">
Click Me!</button>
</div>
</div>
</div>
