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As far as I know, this is right:
<div>
<p>some words</p>
</div>
But this is wrong:
<p>
<div>some words</div>
</p>
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.
And what about other tags’ containment relationship?
An authoritative place to look for allowed containment relations is the HTML spec. See, for example, http://www.w3.org/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”.
For the P element, it specifies the following, which indicates that P elements are only allowed to contain inline elements.
This is consistent with http://www.w3.org/TR/html401/struct/text.html#h-9.3.1, which says that the P element “cannot contain block-level elements (including P itself).”