在一个div中，margin-top:0px;margin-bottom:0px;不能同时满足，将出现什么情况？
div{margin-top:0px;margin-bottom:0px;}
如果满足 margin-top:0px;就不能满足 margin-bottom:0px;
如果满足 margin-bottom:0px;就不能满足 margin-top:0px;
如何处理？
哪个写在后面，就以后面的为准吗？
回复讨论(解决方案)
其实是满足了的
margin的意思是外边距
你可能把margin-bottom理解成了元素距离底部的距离，其实应该是该元素的底部外边距
你设置margin-bottom属性为0，或者margin-rigth属性为0，不会影响到流的布局，因为文档流是从上到下，从左到右的
设置margin是改变了元素占据文档流的空间，设置margin属性为20px,则该元素占据的空间上下左右增大了20px
因为文档流是从上到下，从左到右的，所以我们一般设置margin-top和margin-left会马上看到元素向下和向右移动了相应距离(当然都是在值为正数的情况下)
需要js控制
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