I am creating an address form and want to add placeholders to the fields to display the format of what the user needs to enter.
For email addresses, phone numbers and credit card details this is pretty standard but as a company with a mainly but not exclusive UK customer base, are there any downsides to using information for the placeholders aimed more at UK addresses.
For example -
Postcode/Zip Code: AB12 CD3 instead of Postcode/Zip Code: NY 10118
I know that placeholders for address forms is quite common place but is there a case for not including if you have an international customer base?