The following attributes are used to describe basic constraints: You can see a live example of the postal code validation.
Another common constraint is to limit the size of a file to be uploaded.
The creation of web forms has always been a complex task.
While marking up the form itself is easy, checking whether each field has a valid and coherent value is even more difficult, and informing the user about the problem may become a headache.
If you choose to participate, the online survey will be presented to you when you leave the Msdn Web site.