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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 class="w3-container w3-card-4"> <p> <input class="w3-radio" type="radio" name="gender" value="male" checked> <label class="w3-validate">Male</label></p> <p> <input class="w3-radio" type="radio" name="gender" value="female"> <label class="w3-validate">Female</label></p> <p> <input class="w3-radio" type="radio" name="gender" value="" disabled> <label class="w3-validate">Don't know (Disabled)</label></p> </form> </body> </html>