<style>
#test{animation:change 10s linear 0s infinite;font-size:30px;font-weight:700;}
@keyframes change{0% {color:#333;}25%{color:#ff0;}50%{color:#f60;}75%{color:#cf0;}100% {color:#f00;}}
</style>
<div id="test">这里是内容</div>
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