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<!DOCTYPE html>
<html>
<body>
​
<p>A function is triggered when one of the input fields get focus. The function changes the background-color of the input field.</p>
First name: <input type="text" id="fname" onfocus="myFunction(this.id)"><br>
Last name: <input type="text" id="lname" onfocus="myFunction(this.id)">
​
<script>
function myFunction(x) {
  document.getElementById(x).style.background = "yellow";
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/tags/tryit.asp?filename=tryhtml5_ev_onfocus by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:09:26 GMT -->
</html>
​
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