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In this HTML5 lesson, we learn about the required attribute for the input tag in forms. If a required field is left empty, a tip will prompt the user to fill it in before submitting. The form will not submit unless all required fields are filled. The example includes an input type text with a name and ID, and a submit button within a form tag. To make a field required, simply add the "required" attribute to the input tag. Save the file, preview in a browser (e.g. Opera), and check how the form won't submit without filling in the required field.
