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<!DOCTYPE html> <html> <body> <script> var txt="Hello World!"; document.write("<p>" + txt.toUpperCase() + "</p>"); document.write("<p>" + txt.toLowerCase() + "</p>"); document.write("<p>" + txt + "</p>"); </script> <p> The methods returns a new string. The original string is not changed. </p> </body> </html>
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