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<!DOCTYPE html> <html> <head> <style> div { width: 100px; height: 100px; background: red; position: relative; -webkit-animation: mymove 5s infinite; /* Chrome, Safari, Opera */ animation: mymove 5s infinite; } /* Chrome, Safari, Opera */ @-webkit-keyframes mymove { from {left: 0px;} to {left: 200px;} } @keyframes mymove { from {left: 0px;} to {left: 200px;} } </style> </head> <body> <p>Click the "Try it" button to reverse the direction of the animation.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { document.getElementById("myDIV").style.WebkitAnimationDirection = "reverse"; // Code for Chrome, Safari, and Opera document.getElementById("myDIV").style.animationDirection = "reverse"; } </script> <p><strong>Note:</strong> The animationDirection property is currently only supported in Firefox.</p> <div id="myDIV"></div> </body> </html>