javascript A rel

Defines the relationship between the current element and the destination of the link. Also known as a forward link, not to be confused in any way with the destination document whose address is defined by the href attribute. Mainstream browsers do not take advantage of this attribute for the a element, but you can treat the attribute as a kind of parameter to be checked and/or modified under script control. See the discussion of the a element's rel attribute for a glimpse of how this property may be used in the future.