Tryit Editor v1.8

Source Code:
<!DOCTYPE html> <html> <head> <style> div { width:100px; height:100px; background:red; position:relative; animation:myfirst 5s infinite; animation-direction:alternate; /* Safari and Chrome */ -webkit-animation:myfirst 5s infinite; -webkit-animation-direction:alternate; } @keyframes myfirst { 0% {background:red; left:0px; top:0px;} 25% {background:yellow; left:200px; top:0px;} 50% {background:blue; left:200px; top:200px;} 75% {background:green; left:0px; top:200px;} 100% {background:red; left:0px; top:0px;} } @-webkit-keyframes myfirst /* Safari and Chrome */ { 0% {background:red; left:0px; top:0px;} 25% {background:yellow; left:200px; top:0px;} 50% {background:blue; left:200px; top:200px;} 75% {background:green; left:0px; top:200px;} 100% {background:red; left:0px; top:0px;} } </style> </head> <body> <p><strong>Note:</strong> The animation-direction property is not supported in Internet Explorer 9 and earlier versions.</p> <div></div> </body> </html>
Result:
W3Schools.com - Try it yourself