1.margin塌陷,通俗叫法。
假如一个盒子box里边嵌套了两个盒子(记为box1,box2)。box1的margin-top不会如预想的一样在box顶部撑开一个边距,而是以包含box的容器上边界为基准撑开边距。
解决方法:一、设置box1 padding-top.
二、设置box display:absolute.
三、设置box overflow:hidden。
2.如图示:
此类问题代码为:box{width:500px ; height:50px;line-height:50px; text-align:center; border:1px solid #333;}
box span{display:inline-block; width:100px; height: 20px;}
出现此问题有如下几点:父级元素设置text-align:center;使得盒子内文字居中,此时若不设置 span 为inline-block; ,span会自动撑开;
若span设置为inline-block; ,其宽 度和高度的设置不影响文字位置。
解决方法为:一、父元素设置padding-top。
二、父元素仍设置居中,span 不设置内联块盒子,而设置其内边距,撑开所需要的宽度。
效果如下:
。

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