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<!DOCTYPE html> <html> <body style="font-family: sans-serif; padding: 20px;"> <h3>Formulir Semantik HTML-First</h3> <form onsubmit="event.preventDefault(); alert('Formulir berhasil diproses secara aman!');"> <label for="username">Nama Pengguna (Wajib):</label><br> <input type="text" id="username" required style="padding:8px; margin:8px 0; width:220px;"><br> <button type="submit" style="padding:8px 16px; background:#0d2e5c; color:white; border:none; border-radius:4px; cursor:pointer;">Kirim Formulir</button> </form> </body> </html>
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