One way of doing it is to remove the href element of the link.
In contrast, if a link cannot be reached to while tabbing over a page, adding an
href="javascript:void(0);"
would make the link reachable via tabbing. Moreover, if a 'click' event is attached to the link, the element will respond to the Enter key press despite the fact that the 'keyup' (or other key type event) is not attached.
