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<!DOCTYPE html>
<html>
<body>
<h1>HTML DOM Events</h1>
<h2>The focusin Event</h2>
<p>Use the addEventListener() method to attach a "focusin" event to an input element.</p>
Enter your name: <input type="text" id="fname">
<script>
document.getElementById("fname").addEventListener("focusin", myFunction);
function myFunction() {
  document.getElementById("fname").style.backgroundColor = "red";
}
</script>
</body>
</html>