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<div style="border:2px solid red; 400px; height:200px;">c<div style="100px; height:100px; border:5px solid blue; margin:10px; right:0px; bottom:0px; position:absolute">你好啊！</div></div>
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<div style="100px; height:100px; border:5px solid blue; margin:10px; right:0px; bottom:0px; position:fixed;">你好</div>
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