DataTables - Exporting Headers with HTML

HTML

<link rel="stylesheet" href="//cdn.datatables.net/1.10.8/css/dataTables.jqueryui.min.css">
<link rel="stylesheet" href="//cdn.datatables.net/buttons/1.0.1/css/buttons.jqueryui.min.css">
<script src="//cdn.datatables.net/1.10.8/js/jquery.dataTables.min.js"></script>
<script src="//cdn.datatables.net/1.10.8/js/dataTables.jqueryui.min.js"></script>
<script src="//cdn.datatables.net/buttons/1.0.1/js/dataTables.buttons.min.js"></script>
<script src="//cdn.datatables.net/buttons/1.0.1/js/buttons.jqueryui.min.js"></script>
<script src="//cdn.datatables.net/buttons/1.0.1/js/buttons.flash.min.js"></script>
<script src="//cdn.datatables.net/buttons/1.0.1/js/buttons.html5.min.js"></script>
<script src="//cdn.datatables.net/buttons/1.0.1/js/buttons.print.min.js"></script>
<script src="https://code.jquery.com/ui/1.11.4/jquery-ui.min.js"></script>
<link rel="stylesheet" href="https://code.jquery.com/ui/1.11.4/themes/ui-lightness/jquery-ui.css">
<script src="//cdnjs.cloudflare.com/ajax/libs/jszip/2.5.0/jszip.min.js"></script>
<script src="//cdn.rawgit.com/bpampuch/pdfmake/0.1.18/build/pdfmake.min.js"></script>
<script src="//cdn.rawgit.com/bpampuch/pdfmake/0.1.18/build/vfs_fonts.js"></script>
<table width="100%" class="display" id="example" cellspacing="0">
    <thead>
        <tr>
            <th>Name</th>
            <th>Position</th>
            <th>Office</th>
            <th>Age</th>
            <th>Start date</th>
            <th>Salary</th>
        </tr>
    </thead>
    <tfoot>
        <tr>
            <th>Name</th>
            <th>Position</th>
            <th>Office</th>
            <th>Age</th>
            <th>Start date</th>
            <th>Salary</th>
        </tr>
    </tfoot>
    <tbody>
        <tr>
            <td>Tiger Nixon</td>
            <td>System Architect</td>
            <td>Edinburgh</td>
            <td>61</td>
            <td>2011/04/25</td>
            <td>$320,800</td>
        </tr>
        <tr>
            <td>Garrett Winters</td>
           ...

CSS

body {
    font: 90%/1.45em"Helvetica Neue", HelveticaNeue, Verdana, Arial, Helvetica, sans-serif;
    margin: 0;
    padding: 0;
    color: #333;
    background-color: #fff;
}
div.container {
    min-width: 980px;
    margin: 0 auto;
}

JavaScript

$(document).ready(function () {
	var table = $('#example').DataTable({
		dom: "Blfrtip",
		buttons: [
			{
				extend: "copy",
				exportOptions: {
					stripHtml: false
				}
			},
			{
				extend: "csv",
				exportOptions: {
					stripHtml: false
				}
			},
			{
				extend: "excel",
                header: true,
				exportOptions: {
					stripHtml: false
				}
			},
			{
				extend: "pdf",
				exportOptions: {
					stripHtml: false
				}
			}
		]
	});
});