Usage
If user’s browser is older than IE10, f8-browsehappy appears in the page as
a notification to notify her. You usually consider to put it after opening
<body>
tag.
Oh, crap!
You are using an outdated browser. Please upgrade your browser to improve your experience.
<!--[if lt IE 10]>
<div class="f8-browsehappy">
<div class="f8-browsehappy__modal">
<h1>Oh, crap!</h1>
<p>You are using an <strong>outdated</strong> browser. Please
<a href="http://browsehappy.com/" rel="external" target="_blank">upgrade
your browser</a> to improve your experience.</p>
</div>
</div>
<![endif]-->