Must blockquotes contain paragraphs or must paragraphs contain blockquotes?

Question

In HTML5, is it correct to put blockquotes inside paragraphs or is the opposite the right way? I mean, logic tells that a blockquote may be citing

Answer 1

According to the specs

s can only contains Phrasing content, which blockquote isn't.

On the other side blockquote can contain Flow content which

is.

So only paragraph inside blockquote is valid, but not the opposite.