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# Requirements
https://medium.com/better-programming/here-are-5-front-end-challenges-to-code-dec-2019-edition-7d691c4b023
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.
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