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<!DOCTYPE html> <html> <head> <style> input:invalid { border: 2px solid red; } </style> </head> <body> <h1>Demo of the :invalid selector</h1> <input type="email" value="supportEmail"> <p>Try typing a legal e-mail address, to see the styling disappear.</p> </body> <!-- Mirrored from www.w3schools.com/cssref/tryit.php?filename=trycss_sel_invalid by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 17:38:45 GMT --> </html>
