CSS before after

CSS before after

<div style="font-size: 24px ;"><div id="before">div</div><div id="after">div</div><div id="div">div</div ></div> <style>#before:before{ content:"我是 before"; color:red; } #after:after{content:"我是 after";color:red; } #div:before{ content:"我是 before"; color:red; } #div:after{content:"我是 after";color:red; } </style>

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