问题描述
我需要两个连续的 div （具有背景）无缝地接触，一个在另一个之下。但是，当我把一个 p 元素放到底部 div 时， p 元素的边距强制在 div 之间留出空白。这是奇怪的行为，因为我预计 p 的边缘保持在 div 。它在Firefox，Chrome和IE 8上的呈现方式相同。
I need two consecutive divs (with backgrounds) to be touching seamlessly, one below the other. However, this layout breaks when I put a child p element into the bottom div. The margins of the p element force a blank gap between both divs. This is strange behavior, as I am expecting the margin of the p to stay within the content and background area of the div. It renders the same way on Firefox, Chrome and IE 8.
<div style="background: #ccccff">Top Div</div>
<div style="background: #ffcccc"><p>Bottom Div</p></div>
以下是它的外观。
我可以通过将 p 元素的边距更改为paddings来修复此问题，但是我还必须这样做与头元素，列表元素，和任何其他元素我想使用在 div 开始。这是不可取的。
I could fix this by changing the margins to paddings for the p element, but then I would also have to do this with header elements, list elements, and any other element I want to use at the start of a div. That is not desirable.
有人可以告诉我：我缺少箱子模型的什么警告？是否有一个简单的方法来修复这个问题，最好通过修改 div ？
Could someone enlighten me: what caveat of the box model am I missing? Is there an easy way to fix this, preferably by modifying the style of the div?
推荐答案
这是 * 。有几种方法来解决它。如果浮动div，它们将包含子元素的边距，并防止边缘折叠。另一种方法是向div添加边框或填充。
That is the expected behavior*. There are a few ways to get around it. If you float the divs, they will contain the margins of child elements and prevent margin collapsing. Another approach is to add a border or padding to the divs.
* div的边距和p组合形成单个边距，即使它们是嵌套，因为它们具有邻接的边距，它们之间没有填充或边框。
* The margins of the div and the p "combine to form a single margin", even though they are nested, because they have adjoining margins with no padding or border between them.
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