Perhaps not too many people use .html as a source; BD seems so popular amongst the veteran uploaders here.
For those that do work with .html as a source, be sure to read the Project Gutenberg guidelines on producing their .html ebooks
here.
Especially useful for those old (
the format not the ebook creators 
) .txt die-hards is Section
H.13. How can I make a HTML version from my plain text file? therein!