I just found yet another web site that has a place to enter a credit card number but limits the input to exactly the length of a card, and has that stupid "No dashes or spaces" limitation. Spacing in credit card numbers (and phone numbers) is there for a reason, to give people a way to process information in small chunks, and it's much easier to verify that my card number is right when I can type in the spaces and compare it back that way.

I understand that web software has to be careful about users entering bogus or dangerous data into a web form, but spaces and dashes? Is there any good reason to forbid this entry on a web form? I can't think of one.

What a lousy user interface.