Board Thread:Support Requests - Getting Technical/@comment-4962933-20140707090303/@comment-5454372-20140707140145

What if you used #switch in such a way that if neither desired choice is entered, it collapses the whole infobox and shows a warning instead? Something like...

Whether that's a user-friendly design is quite debatable, but it'll force the user to read the instructions if they don't want to leave the page with the infobox in its "warning" state.

Otherwise, I'd suggest making one of the choices the default one if a non-matching string is entered (i.e. "Type YES if you want 3 rows, otherwise this box will always show you the alternative option").