Nesting block level elements inside the tag… right or wrong?

Question

Is it syntactically and semantically correct to nest

or any other block level element inside the

tag. I am talking about HTML

Answer 1

FWIW: I had a paragraph bracketed by paragraph tags. Inside that I put a div with display:inline on the div. But it still treated the div as a block element and closed the paragraph, creating a new line with a paragraph spacing.

It appears that any block element inside paragraph tags forces the paragraph to close even if the block element is being displayed as inline in its CSS.