今天继续接着CSS盒子模型补充，CSS基础学习十三：盒子模型和CSS基础学习十四：盒子模型补充之display属
性设置都是介绍了盒子模型中的内容概括。开始今天的主题：外边距合并。
外边距合并指的是，当两个垂直外边距相遇时，它们将形成一个外边距。合并后的外边距的高度等于两个发生合
并的外边距的高度中的较大者。
(1)外边距合并
外边距合并叠加是一个相当简单的概念。但是，在实践中对网页进行布局时，它会造成许多混淆。简单地说，外
边距合并指的是，当两个垂直外边距相遇时，它们将形成一个外边距。合并后的外边距的高度等于两个发生合并的外
边距的高度中的较大者。
当一个元素出现在另一个元素上面时，第一个元素的下外边距与第二个元素的上外边距会发生合并。请看下图：
如果看上面的图还不直观，我们来举一个实例：
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"><title>CSS</title>
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