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<!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 propertyName property returns the name of the CSS property the transition effect is for.</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 6.0 document.getElementById("myDIV").addEventListener("webkitTransitionEnd", myFunction); // Standard syntax document.getElementById("myDIV").addEventListener("transitionend", myFunction); function myFunction(event) { this.innerHTML = "CSS Property used: " + event.propertyName; } </script> </body> </html>