This is the ((expand section))
message box.
It can be placed at the top of article sections that need expansion, below the section title. It can also be used on other pages such as in "Wikipedia:" space. (This template currently only uses the "article message box" style, but that is a bug we are going to fix.)
This template can be used without any parameters, like this:
((Expand section))
It can also take the current month and year as a parameter, which is used in categorising the page into a corresponding category. (See more on that below.) Like this:
((Expand section|date=September 2024))
The date parameter causes no visible change in the message box itself, it only makes the page categorise properly.
This template can also take an unnamed parameter with an explanation of what expansion the section needs. And you can of course feed the date parameter at the same time. Like this:
((Expand section|examples and additional citations|date=September 2024))
((expand))
instead.When this template is used in main (article) space it places the article in Category:Articles to be expanded.