Button Extensions not showing up

I created a JS fiddle to show this: https://jsfiddle.net/q0ruv6sx/2/

I am instantiating this by the following code:

                    ThisDataTable = $('#MyTable').DataTable({
                        data: TableData,
                        buttons: [
                            {
                                extend: 'pdfHtml5',
                                download: 'open'
                            },
                            'print'
                        ],
                        columns: [
                            { title: "Number" },
                            { title: "Name" },
                            { title: "Start Date" },
                            { title: "Customer" },
                            { title: "Location" },
                            { title: "Sales Person" }
                        ]
                    });

I have tried without the pdfHtml5 button as well.

I am including all of the recommended JS and CSS from the download tool provided.