code: function getRole(elm) {
          elm = elm || focusedElement;
  
          if (isElement(elm)) {
            return elm.getAttribute('role');
          }
  
          return null;
        }
docs: Returns the currently focused elements wai aria role of the currently
  focused element or specified element.
  
  @private
  @param {Element} elm Optional element to get role from.
  @return {String} Role of specified element.