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<!DOCTYPE html> <html> <title>W3.CSS</title> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="lib/w3.css"> <body> <form action="/action_page.php" class="w3-container"> <h2>Validating Labels</h2> <p>Validating labels are red, and turns green when the input becomes valid. To make labels validating, add a w3-validate class to your w3-label class.</p> <p> <input class="w3-input" type="text" name="first" required> <label class="w3-label w3-validate">First Name</label></p> <p> <input class="w3-input" type="text" name="last" required> <label class="w3-label w3-validate">Last Name</label></p> <p> <input class="w3-input" type="email" name="email" required> <label class="w3-label w3-validate">Email</label></p> <p> <button class="w3-btn w3-teal">Register</button></p> </form> </body> </html>
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