Block of repeated content

A block of content B, inside a web page P, is a block of repeated content if both the following are true:

(distance 1) there exist an instrument in P which leads the user to another web page P' whose URL has a different host, port (including default port for special URL), or path; and
(repeated) there exist a block of content in P' which is equivalent to B.

This definition only considers pages at "distance 1" from the current page. The instrument leading there is usually a link, sometimes a button. In addition, P' can be any page and is not restricted, for example, to pages of the same website.

The blocks of repeated content are not uniquely defined. For example <div><span id="repeated-1"></span><span id="repeated-2"></span><span id="not-repeated"></span></div> can be considered to have two blocks of repeated content (each of the first two span) or one (both the first two span together).