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CSS高级.md
定位的参照物就是包含块 根元素的包含块也称初始包含块(由用户代理:浏览器) 初始包含块是一个视窗大小的矩形(定位参照) 位置以及大小默认和视窗一样但不代表就是视口 根元素不是html元素就是body元素 非根元素的相对定位或无定位时的包含块就是离它最近 ...
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