span设为inline-block之后，为什么未包含文字时下面会多出一条空白？-H5 Tutorial-php.cn

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span设为inline-block之后，为什么未包含文字时下面会多出一条空白？

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Jun 07, 2016 am 08:45 AM

回复内容：

泻药
貌似说的是这个
http://w3help.org/zh-cn/causes/RD3020 为什么我提问从来都无人问津？这个问题的主要原因是：元素的默认vertical-align是baseline。在CSS规范的Visual formatting model details中关于vertical-align: baseline有以下的描述：

baselineAlign the baseline of the box with the baseline of the parent box. If the box does not have a baseline, align the bottom margin edge with the parent's baseline.

因为推断一个元素的baseline的位置，需要根据它使用的字体信息来推断（一个span中的文字可能因为字符集不同，而使用不同的字体）。因此，一个没有内容的inline-block也就没有了baseline。因此，对齐的时候，就会将它的底边作为baseline在父容器中对齐。你的例子中多出来的3px就是baseline到底边的距离。
写到这里，发现父容器的baseline应该也算不出来啊。不知道谁可以补充一下。
解决这个问题的方法就很多了：设置span的vertical-align为bottom；或为span添加内容为空格；

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