To ensure that disabled visitors have an optimal experience in navigating the site, buttons should have the following attributes:
title - Populate this with meaningful text so that screen readers for visually impared users give good direction.
<a class="button" title="Signup for our newsletter" href="#">Default Button</a>
role="button" - This should be set so that users can interact with the button by keyboard
<a class="button" role="button" href="#">Default Button</a>