Your users should be able to:
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View an age in years, months, and days after submitting a valid date through the form
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Receive validation errors if:
- Any field is empty when the form is submitted
- The day number is not between 1-31
- The month number is not between 1-12
- The date is in the future
- The date is invalid e.g. 31/04/1991 (there are 30 days in April)
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View the optimal layout for the interface depending on their device's screen size
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See hover and focus states for all interactive elements on the page
