Make new HTML5 tags styleable in < IE9 (included in some frameworks, eg Modernizr):
<!--[if lt IE 9]>
<script src="https://cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.3/html5shiv.js"></script>
<![endif]-->
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>My website</title>
<meta name="description" content="websitedescription">
<meta name="author" content="authorName">
<link rel="stylesheet" href="css/styles.css">
<style>
</style>
<!--[if lt IE 9]>
<script src="https://cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.3/html5shiv.js"></script>
<![endif]-->
</head>
<body>
<p>stuff</p>
<script src="js/scripts.js"></script>
</body>
</html>