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<!DOCTYPE html> <html> <head> <title>Title of the Document</title> <style> #alert { padding: 20px; font-size: 20px; border-radius: 5px; color: red; background-color: yellow; } </style> </head> <body> <script> let div = document.createElement('div'); div.id = "alert"; div.innerHTML = "Welcome to <strong>W3Docs</strong>"; document.body.append(div); setTimeout(() => div.remove(), 1000); </script> </body> </html>