CSS 属性 width:100%相对于父元素的哪部分计算? - V2EX
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rabbbit
V2EX    CSS
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  •   rabbbit 2017-11-11 22:29:17 +08:00 6001 次点击
    这是一个创建于 2966 天前的主题,其中的信息可能已经有所发展或是发生改变。
    普通状态下,似乎相对于父元素宽度计算



    子元素加上 position:absolute 后,变成相对于父元素的 width + padding 了?




    [示例]( http://htmlpreview.github.io/?https://github.com/Aaron-Bird/baiduIFE/blob/master/note/width100%25.html)
    第 1 条附言    2017-11-12 02:42:18 +08:00
    https://css-tricks.com/almanac/properties/w/width/#article-header-id-0
    For absolutely positioned elements whose containing block is based on a block container element, the percentage is calculated with respect to the width of the padding box of that element.
    oh
        1
    oh  
       2017-11-12 01:30:17 +08:00   2
    这是两个问题了。
    一、默认状态下 width 100% 是相对于父元素的可用宽度,不含 padding。
    二、加了 absolute 之后元素变成了 绝对定位,会一直向上寻找第一个非 static 的父元素(例如其它的 absolute 或 relative ),如果上级元素中都没有,那就是相对于 body 了,所以这时候搭配 width 100% 的话就是占据整个视图区域的宽度了。
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