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<!DOCTYPE html> <html> <body> <p>This example uses the addEventListener() method to attach a "focusout" event to an input element.</p> <p>Write something in the input field, and then click outside the field to lose focus.</p> <input type="text" id="fname"> <p><strong>Note:</strong> Firefox does not support the onfocusout event.</p> <script> document.getElementById("fname").addEventListener("focusout", myFunction); function myFunction() { alert("Input field lost focus."); } </script> </body> </html>