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571 B


Number 3

What is an input mask?

Input masks are a way to control what data can be entered into a form’s field. They are governed by a strict set of rules that site visitors can’t break while trying to fill out your form.

What you will learn by completing this challenge

  • How to use enforced strict rules for your forms and inputs.
  • How to use JavaScript to validate forms.
  • How to use CSS and JavaScript to create dynamic forms.