how to add 'title' attribute to 'copy', 'excel', 'previous' and 'next' buttons for 508 compliance

I use datatable with 'copy', 'excel', 'print' buttons. How to add 'title' attribute to all buttons (including 'previous', '1', '2', ...'next' buttons of pagination) for 508. Below is my code:

$('#results').DataTable({
dom: 'Bfrtip',
buttons: ['copy', 'csv', 'excel', 'print']
});

Thank you so much in advance!