The Free On-line Dictionary of Computing (30 December 2018):

breadcrumbs

   (After the story "Hansel and Gretel" by the Brothers Grimm).

   1.  Links displayed across the top of a web
   page listing the most recently visited pages so the reader
   can quickly jump back to one.  Since this function is provided
   by the web browser, breadcrumbs are a waste of space.

   A better use of the space is to display links to the page's
   logical parent pages in the information hierarchy.

   2.  Information output by statements inserted
   into a program for debugging by printf.

   [Jargon File]

   (2007-03-07)