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In this HTML5 lesson, we discuss the required attribute in the input tag for forms. If a field is left empty and the form is submitted, a message will pop up indicating that the field is required. The form will not submit or process until the required field is filled in. The example includes an input field with the required attribute, a submit button, and wrapping form elements in the form tag. Simply add "required" to the input that needs to be filled in, then preview in Opera to see how the form will not submit until the required field is completed.