为什么设置的margin-top不不起作用:
建议:尽可能的手写代码，可以有效的提高学习效率和深度。
大家知道可以通过margin-top属性设置对象的上外边距，但是有时候设置了此属性之后，并没有起任何作用。多种原因造成的，其中一个就有由外边距合并造成的，下面再介绍一种。先看一段代码实例:
<!DOCTYPE html><html><head><meta charset=" utf-8"><meta name="author" content="http://www.softwhy.com/" /><title>蚂蚁部落</title><style type="text/css">div { width: 400px; height: 400px; border: 1px solid red;}span { border: 1px solid green; margin-top: 50px; margin-left: 50px;}</style></head><body><div><span class="children">欢迎来到蚂蚁部落</span></div></body></html> 由以上代码可以看出，span的上外边距并没有起作用。这是因为span是个内联元素，内联元素的上外边距和下外边距都不会起作用，但是左右外边距会有作用。
原文地址是:http://www.softwhy.com/forum.php?mod=viewthread&tid=4656
更多内容可以参阅:http://www.softwhy.com/divcss/
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