<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://apps.bdimg.com/libs/bootstrap/3.3.0/css/bootstrap.min.css">
<script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script>
<script src="https://apps.bdimg.com/libs/bootstrap/3.3.0/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Example</h2>
<p>The .show class forces an element to be shown (display:block):</p>
<p class="show">This paragraph is forced to be shown (display:block).</p>
<p>The .hidden class forces an element to be hidden (display:none):</p>
<p class="hidden">This paragraph is forced to be hidden (display:none).</p>
<p>The .invisible class makes an element invisible (visibility:hidden) - will take up space on page:</p>
<p class="invisible">This paragraph is forced to be hidden (visibility:hidden).</p>
<p>Sample text to show elements with class="invisible" takes up space.</p>
</div>
</body>
</html>