The ______ attribute is used to validate the form submission by ensuring that a field is filled out before submitting.

check
mandatory
required
validate

The "required" attribute is used with ,

elements to indicate that a value must be provided before submitting a form. If a user attempts to submit a form without filling out a field marked as "required", the browser will display an error message and prevent the form from being submitted. This client-side validation helps ensure that crucial data is not missed and reduces the number of incomplete form submissions. </div>
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