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<!DOCTYPE html> <html> <body> Enter your name: <input type="text" onfocusin="myFunction(this)"> <p>When the input field gets focus, a function is triggered which changes the background-color.</p> <p><strong>Note:</strong> Firefox does not support the onfocusin event</p> <script> function myFunction(x) { x.style.background = "yellow"; } </script> </body> </html>