Note: This will not change the behaviour of various software components immediately. Instead, they will each need to be updated – see the blocked tasks.
See documentation for the format parameter, at:
However, here are two examples of how to add the parameter, at beta cluster:
Original title: html2wt: new templates should display one parameter per line
I understand this was partly discussed in T53175: Parsoid does not add newlines between parameters in new template invocations, making wikitext difficult to read (with suggestions about how to handle the issue), but whatever happened next didn't seem to affect this :)
If you check out the source of https://it.wikipedia.org/w/index.php?title=Utente:Elitre_(WMF)/Sandbox_VE&oldid=64531360 , you'll notice a couple of templates at the top. Those were added with VE, and are collapsed, whereas editors on it.wp would want those kind of templates (which are basically infoboxes) to always display one parameter per line, no matter what the length of the template is.
See Also: T53003