css margin padding
<body> <div style="background: blue;margin: 10px;"> <img src="/static/imghwm/default1.png" data-src="../images/eg_arrow.gif" class="lazy" alt="" style="max-width:90%"> <div style="margin: 20px;padding: 30PX;background-color: red"> hello </div> </div> <div style="background: green;margin: 10px;"> <span>world</span> </div></body>
回复讨论(解决方案)
LZ应该设置外部DIV的style：padding:20px，内部DIV就不会和外部DIV重合了
LZ应该设置外部DIV的style：padding:20px，内部DIV就不会和外部DIV重合了
这个我知道。我只是想知道外边距为什么没用。
我好像懂了：在嵌套的情况下：相同元素的话，相邻的外边距会叠在一起，只取决与较大的外边距；不同元素的话外内嵌元素的外边距会起作用。（外边距是透明的）；在同等级别下：相同元素的外边距相邻边的外边距会叠在一起，取决于大的外边距。不同元素的外边距会叠加。
呵呵，这个我倒是没怎么细究过。学习了
LZ应该设置外部DIV的style：padding:20px，内部DIV就不会和外部DIV重合了
这个我知道。我只是想知道外边距为什么没用。
我好像懂了：在嵌套的情况下：相同元素的话，相邻的外边距会叠在一起，只取决与较大的外边距；不同元素的话外内嵌元素的外边距会起作用。（外边距是透明的）；在同等级别下：相同元素的外边距相邻边的外边距会叠在一起，取决于大的外边距。不同元素的外边距会叠加。
详细参考：http://blog.csdn.net/chx10051413/article/details/12572701
margin+padding+border+width/height 是一个元素所占的区域
margin是两个元素之间的距离。这个距离可以被重叠覆。父元素和子元素之间用的是padding。
最主要原因是你没有设置外部div的height，所以外部div的最低层位置取决于红色背景的高度，如果设置外部div的height就可以了。其实你设置的红色背景的div的margin对于底部是没有意义的。
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