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<!DOCTYPE html> <html> <head> <style> input:user-invalid { border: 2px solid red; background-color: beige; } input:user-invalid + span::before { content: "X"; color: red; } </style> </head> <body> <h1>Demo of :user-invalid</h1> <p>Try typing an illegal e-mail address.</p> <p>Try typing an illegal number.</p> <label for="name">Name: </label><br> <br> <label for="email">Email: </label><br> <p>Input a number between 1 and 10: </p> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>