What does the required attribute on a form input enforce?

What does the required attribute on a form input enforce?

• A. It makes the field read-only.
• B. It hides the field until filled.
• C. It automatically submits the form when the field is filled.
• D. It requires the field to be filled before submission.

Answer: (D)

The required attribute enforces that a value must be provided for that field before the form can be submitted. It activates HTML5 form validation, so if a user tries to submit with an empty field marked as required, the browser blocks submission and typically shows a message like “Please fill out this field.” This is about ensuring essential data is collected, not about changing how the field looks or behaves. It doesn’t make the field read-only, it doesn’t hide the field, and it doesn’t auto-submit the form. The constraint applies to inputs, selects, and textareas, and in groups like radios or checkboxes it requires a selection within that group.

The required attribute enforces that a value must be provided for that field before the form can be submitted. It activates HTML5 form validation, so if a user tries to submit with an empty field marked as required, the browser blocks submission and typically shows a message like “Please fill out this field.” This is about ensuring essential data is collected, not about changing how the field looks or behaves. It doesn’t make the field read-only, it doesn’t hide the field, and it doesn’t auto-submit the form. The constraint applies to inputs, selects, and textareas, and in groups like radios or checkboxes it requires a selection within that group.