previous

      PREVIOUS or PREV
         The PREVIOUS relationship identifies the previous document in
         an author-defined sequence of documents, such as a linear
         book.

         When REL=PREVIOUS, the target document is previous to the
         current document.

         When REV=PREVIOUS, the current document is previous to the
         target.

         If the hypertext link is specified with REL in a LINK element,
         an HTML user agent may present an icon in a tool bar.

REL=Previous

The link references the previous document in a guided tour.

rel=previous

The link references the previous document in a guided tour.