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<!DOCTYPE html> <html> <body> <h2>JavaScript String Methods</h2> <p>Convert string to upper case:</p> <button onclick="myFunction()">Try it</button> <p id="demo">Hello World!</p> <script> function myFunction() { let text = document.getElementById("demo").innerHTML; document.getElementById("demo").innerHTML = text.toUpperCase(); } </script> </body> </html>
