Compare with EPUB conventions

[ppKrauss]

See idpf.org/epub/31/spec/epub-contentdocs at sec-xhtml (eg. convention for preamble sections as <section epub:type="preamble">) and content-content-reqs (eg. " A container-constrained script must not contain instructions for modifying the DOM of the parent Content Document").

See also:

• https://github.com/IDPF/epub3-samples
• https://github.com/IDPF/epubcheck
• http://www.idpf.org/epub/31/spec/epub-spec.html
• https://idpf.github.io/epub-vocabs/structure

[ppKrauss]

Also MHTML is a "non-script, etc. HTML", so also interesting to compare.