What html5 form attribute should be used for a zipcode?

Question

Is it best to use a \'text\' attribute with a limit on the number of characters, or can I use a number attribute in an input for a zipcode.

Just trying to get my head ar

Answer 1

To allow ZIP+4:

To be friendly to the user, this also permits whitespace before/after the string, which the developer will need to trim serverside.