<!DOCTYPE html>
<html>
<body>
<p>This example demonstrates how to assign an "onfocusout" 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" onfocusout="myFunction()">
<p><strong>Note:</strong> Firefox does not support the onfocusout event.</p>
<script>
function myFunction() {
alert("Input field lost focus.");
}
</script>
</body>
</html>