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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Internal JavaScript Example</title> <!-- Internal JavaScript inside <script> tag --> <script> function showMessage() { alert("Hello from Internal JavaScript!"); } </script> </head> <body> <h1>Internal JavaScript Example</h1> <button onclick="showMessage()">Click Me</button> </body> </html>