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<!DOCTYPE html> <html> <head> <title>Titre du document</title> <style> .example { margin: 40px auto; max-width: 400px; } label, button { display: block; width: 100%; margin-bottom: 1.5em; } input, select, button { padding: .4em 1em; } input, select { border: 1px solid #666666; } input:optional, select:optional { background-color: #eeeeee; color: #666666; } input:required, textarea:required { border-bottom: 3px solid #1c87c9; } </style> </head> <body> <h2>Exemple du sélecteur :required</h2> <div class="example"> <form action="#"> <label> <input type="name" required>Nom* </label> <label> <input type="email" required>Email * </label> <label> <input type="phone">Téléphone(optionnel) </label> <label> <input type="url">Adresse (optionnel) </label> </form> </div> </body> </html>