CSS
<style>@keyframes keyname{0%{transform: translate(0);}50%{transform: translate(400px);}100%{transform: translate(0);}}div{width: 100px;height: 100px;background-color: cornflowerblue;animation: 1s keyname;animation-duration: 5s;animation-delay: 1s;animation-timing-function: linear;animation-iteration-count: infinite;animation-direction: reverse;animation-fill-mode: forwards;animation-play-state: paused;}</style>
HTML
<body><div></div>
</body>
测试方块
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