User blog comment:Ducksoup/Wikia's Portability Progress Check!/@comment-24473195-20151118072338/@comment-24473195-20151118143900

@FishTank:

That's correct. Not sure why it didn't work when I first tried it (before making the above post). It apparently creates a new "custom" infobox with those parameters and previews it separately from the "others".

Overall the infobox preview is a pretty well thought out and usable feature. I wouldn't mind if the current version was deployed in a wiki as is.