• Design an HTML page that implements an online submit form of the domain of your choice. Suggested domains are information inquiry, online purchase, membership application, airline reservation.
• Required items:
  1. The form must check at least one field for the presence of an input value.
  2. The form must check at least one field for valid format using a regular expression for validation.
  3. The form must provide at least one optional field that only appears if it is appropriate for a previous selection. For example, a textfield might appear of the the user checks a checkbox with the label "My order has special requests."