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<!DOCTYPE html> <html> <body> <h1>My First JavaScript</h1> <p>JavaScript can change the content of an HTML element:</p> <button type="button" onclick="myFunction()">Click Me!</button> <p id="demo">This is a demonstration.</p> <script> function myFunction() { document.getElementById("demo").innerHTML = "Hello JavaScript!"; } </script> </body> </html>
