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<html><head><style> div { width: 100px; height: 100px; background: red; position: relative; animation: myfirst 5s 2; 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;}}</style></head><body><h1>animation-direction: alternate</h1><p>Play the animation forwards first, then backwards:</p><div></div></body></html>