User blog comment:Ducksoup/The Future of Infoboxes on Wikia/@comment-168424-20150829160604/@comment-24473195-20150829162339

Not sure where you got the idea that parser functions don't work. The only instance where they may "appear" not to have any effect is when the tag doesn't receive any input but that can be overcome using the default tag,e.g.:

Doesn't work if "" is empty (i.e. returns blank)

Works:

Output: