为什么< p>标签包含< div>里面的标签?

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据我所知，这是正确的:

As far as I know, this is right:

<div> <p>some words</p> </div>

但这是错误的:

<p> <div>some words</div> </p>

第一个可以通过 W3C验证器(XHTML 1.0)，但第二个则不能.我知道没有人会像第二个那样编写代码.我只想知道为什么.

The first one can pass the W3C validator (XHTML 1.0), but the second can't. I know that nobody will write code like the second one. I just want know why.

那其他标签的收容关系又如何呢?

And what about other tags' containment relationship?

推荐答案

HTML规范是寻找允许的收容关系的权威之地.参见例如 www.w3/TR/html4/sgml/dtd.html .它指定哪些元素是块元素，哪些是内联元素.对于这些列表，搜索标记为"HTML内容模型"的部分.

An authoritative place to look for allowed containment relations is the HTML spec. See, for example, www.w3/TR/html4/sgml/dtd.html. It specifies which elements are block elements and which are inline. For those lists, search for the section marked "HTML content models".

对于P元素，它指定以下内容，这表明P元素只允许包含内联元素.

For the P element, it specifies the following, which indicates that P elements are only allowed to contain inline elements.

<!ELEMENT P - O (%inline;)* -- paragraph -->

这与 www一致. w3/TR/html401/struct/text.html#h-9.3.1 ，其中指出P元素不能包含块级元素(包括P本身)."

This is consistent with www.w3/TR/html401/struct/text.html#h-9.3.1, which says that the P element "cannot contain block-level elements (including P itself)."