Since I’ve NEVER seen a UA that does ANYTHING useful with REL on tags other than LINK, (and then only prev/next are actually used) I’d just swing a giant axe at those as being pointless bloat… Kind of like title attributes that say the same or less than the contents of the tag they’re applied to… which means depending on what your PHP is putting inside that anchor, I’d be swinging a giant axe at that TITLE attribute for being pointless as well.