closeField - Curious

[Mike Kerner]

OK, if I understand previous threads correctly, closeField does not get send
when you click on a button.  So what happens if you click on a button that
does something that causes the field to lose the focus - e.g. navigating to
another card, putting different text in the field, selecting the text of
another field, etc. what then?

I guess I need a better explanation of when closeField does and does not get
sent.