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<!DOCTYPE html> <html> <body> <h1>The input required attribute</h1> <p>The required attribute specifies that an input field must be filled out before submitting the form.</p> <form action="/action_page.php"> <label for="username">Username:</label> <input type="text" id="username" name="username" required> <input type="submit" value="Submit"> </form> </body> </html>