The "/vdiff" page:

URL: /vdiff?from=TAG&to=TAG

Show the difference between two check-ins identified by the from= and
to= query parameters.

Query parameters:

  from=TAG        Left side of the comparison
  to=TAG          Right side of the comparison
  branch=TAG      Show all changes on a particular branch
  v=BOOLEAN       Default true.  If false, only list files that have changed
  sbs=BOOLEAN     Side-by-side diff if true.  Unified diff if false
  glob=STRING     only diff files matching this glob
  dc=N            show N lines of context around each diff
  w=BOOLEAN       ignore whitespace when computing diffs
  nohdr           omit the description at the top of the page


Show all differences between two check-ins.