It is semantically correct to use inside ?

Question

All examples I found on internet refers to using

inside

, but nothing related to the use of

e

Answer 1

header is:

introductory content for its nearest ancestor sectioning content or sectioning root element.

section is a valid sectioning content, so header is semantically correct - even encouraged - in this position.

Quote taken from this HTML5 Doctor page, which actually quotes the HTML5 spec directly.