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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>External JavaScript Example</title> </head> <body> <h1>External JavaScript Example</h1> <button onclick="showMessage()">Click Me</button> <!-- Linking the external JS file --> <script src="script.js"></script> </body> </html>