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<!DOCTYPE html> <html> <body> <p>When you enter the input field (child of FORM), a function is triggered which sets the background color to yellow. When you leave the input field, a function is triggered which removes the background color.</p> <form id="myForm"> <input type="text" id="myInput"> </form> <script> var x = document.getElementById("myForm"); x.addEventListener("focus", myFocusFunction, true); x.addEventListener("blur", myBlurFunction, true); function myFocusFunction() { document.getElementById("myInput").style.backgroundColor = "yellow"; } function myBlurFunction() { document.getElementById("myInput").style.backgroundColor = ""; } </script> </body> </html>