W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<head>
<style> 
#myDIV {
  width: 100px;
  height: 100px;
  background: yellow;
  -webkit-transition: 2s; /* For Safari 3.1 to 6.0 */
  transition: 2s;
}

#myDIV:hover {
  width: 400px;
}
</style>
</head>
<body>

<p>Hover over the div element below, and wait for the transition effect to end.</p>

<p>The elapsedTime property returns the number of seconds the transition effect has been running.</p>

<p><b>Note:</b> This example does not work in Internet Explorer 9 and earlier versions.</p>

// Standard syntax
document.getElementById("myDIV").addEventListener("transitionend", myFunction);

function myFunction(event) {
  this.innerHTML = "Transition lasted: " + event.elapsedTime + " seconds";
}
</script>

</body>

</html>

​x
 
<!DOCTYPE html><html><head><style> #myDIV {  width: 100px;  height: 100px;  background: yellow;  -webkit-transition: 2s; /* For Safari 3.1 to 6.0 */  transition: 2s;}​#myDIV:hover {  width: 400px;}</style></head><body>​<p>Hover over the div element below, and wait for the transition effect to end.</p>​<p>The elapsedTime property returns the number of seconds the transition effect has been running.</p>​<div id="myDIV"></div>​<p><b>Note:</b> This example does not work in Internet Explorer 9 and earlier versions.</p>​<script>// Code for Safari 3.1 to 6.0document.getElementById("myDIV").addEventListener("webkitTransitionEnd", myFunction);​// Standard syntaxdocument.getElementById("myDIV").addEventListener("transitionend", myFunction);​function myFunction(event) {  this.innerHTML = "Transition lasted: " + event.elapsedTime + " seconds";}</script>​</body>​<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_event_transition_elapsedtime by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 17:40:08 GMT -->