What's in that name?
What the word POSHDOC means
… encapsulates the best practices of using semantic HTML to author web pages.
A POSH-document — POSHDOC — is a HTML document, or a collection of them, which use HTML5 markup for documentation semantics, according to the POSHDOC specification.
A defining property is, that the user accessible content of a POSHDOC does not change, when all interactive and presentational markup is removed.