<div style="width: 500px;height: 400px;border: 1px solid red;position: relative">
<div style="height: 200px">
<!-- 这个absolute只认识relateve,别的都不认识-->
<div style="position: absolute;bottom: 0;right: 0">aaa</div>
</div>
</div>
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<div style="width: 500px;height: 400px;border: 1px solid red;position: relative">
<div style="height: 200px">
<!-- 这个absolute只认识relateve,别的都不认识-->
<div style="position: absolute;bottom: 0;right: 0">aaa</div>
</div>
</div>
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