# JavaScript form input mask demonstration

The following form fields use unobtrusive JavaScript to implement "input masks." The maximum field length is automatically limited to the length of the mask. The characters you can enter into the fields are constrained, and separators are automatically added, but no actual value checking is done. For example, the date input is constrained to the general format for a date, but you can enter an invalid date into the field.

Date (US format) Time Phone number