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<!DOCTYPE html> <html> <head> <script> function myFunction() { document.getElementById("demo").innerHTML = "Hello World!"; } </script> </head> <body> <p>When you click "Try it", a function will be called.</p> <p>The function will display a message.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> </body> </html>