img图片底部出现莫名的下边距问题_html/css_WEB-ITnose
谷歌中这样是解释的：
图片底部的空隙实际上涉及行内元素的布局模型，图片默认的垂直对齐方式是基线，而基线的位置是与字体相关的。所以在某些时候，图片底部的空隙可能是 2px，而有时可能是 4px 或更多。不同的 font-size 应该也会影响到这个空隙的大小。
解决办法：
给img定义vertical-align或者定义为块状，最优的解决办是定义vertical-align，注：定义vertical-align为middle时在IE6中大概还有一像素的顶边距，最好为top或bottom。当然还有种极端解决办法大家可以试试就是将 父容器的字体大小为零，font-size:0
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