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<!DOCTYPE html> <html> <body> <h1>JavaScript Strings</h1> <h2>To toUpperCase() Method</h2> <p>toUpperCase() converts a string to uppercase letters:</p> <p id="demo"></p> <script> let text = "Hello World!"; let result = text.toUpperCase(); document.getElementById("demo").innerHTML = result; </script> </body> </html>
