<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Example</h2>
<p>The .sr-only class hides an element to all devices except screen readers:</p>
<a class="sr-only" href="tryit.asp-filename=trybs_ref_hlp_sr-only&stacked=h.html#">Skip to main content</a>
<p>Combine .sr-only with .sr-only-focusable to show the element again when it is focused (e.g. by a keyboard-only user):</p>
<a class="sr-only sr-only-focusable" href="tryit.asp-filename=trybs_ref_hlp_sr-only&stacked=h.html#">Skip to main content</a>
</div>
</body>
</html>