This template is intended to be useful for creating links to "diffs"; that is, links to pages that show the differences between two versions of a wiki page.
Every version of a page has a revision ID, which you can find from the history of the page by looking at the link for the timestamp, which is of the form:
http[s]://en.wikipedia.org/w/index.php?title=SomePageName&oldid=442212827
The number after oldid= is the revision ID.
This template does not require the page name, and provides a diff between a specified revision ID and the one immediately before it (i.e. what changed at a certain ID).
.svg/1280px-Test_Template_Info-Icon_-_Version_(2).svg.png){kind=icon}
{{Diff2|oldid|section|label}}If 3 parameters are specified (i.e. parameter {{{3}}} exists), parameter {{{2}}} is the section, and parameter {{{3}}} is the label. Otherwise, parameter {{{2}}}, if present, is the label (and the link is to the whole page).
(Consequently, specifying a section but no label can be achieved by leaving the label blank save for its pipe character, as in the fourth example below.)
You can use the following text in place of "Diff2":