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<!DOCTYPE html> <html> <body> Enter your name: <input type="text" id="fname" onfocusout="myFunction()"> <p>When you leave the input field, a function is triggered which transforms the input text to upper case.</p> <p><strong>Note:</strong> Firefox does not support the onfocusout event.</p> <script> function myFunction() { var x = document.getElementById("fname"); x.value = x.value.toUpperCase(); } </script> </body> </html>