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<!DOCTYPE html> <html> <head> <style> div { width: 100px; height: 100px; background: red; position: relative; animation: mymove 5s 1; } @keyframes mymove { from {left: 0px;} to {left: 200px; background-color:blue;} } </style> </head> <body> <h1>Change animation-fill-mode with JavaScript</h1> <p>Click the "Try it" button to let the DIV element keep the styles set by the last keyframe: to {left:200px;}, when the animation is finished.</p> <button onclick="myFunction()">Try it</button> <div id="myDIV"></div> <script> function myFunction() { document.getElementById("myDIV").style.animationFillMode = "forwards"; } </script> </body> </html>