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<!DOCTYPE html> <html> <head> <style> input:valid { background-color: yellow; } </style> </head> <body> <h3>A demonstration of the :valid selector.</h3> <input type="email" value="support@exampel.com"> <p>Try typing an illegal e-mail address, to see the styling disappear.</p> <p><strong>Note</strong>: The :valid selector is not supported in Internet Explorer 9 and earlier versions.</p> </body> </html>