Re: [help-texinfo] [feature request] adding footer to HTML pages

[Karl Berry]

         -c HTML_PAGE_FOOTER=

I'm not sure if it will solve your case, but FWIW, we used
-c PRE_BODY_CLOSE for this purpose for an unofficial LaTeX manual I
contribute to. Here is one of its intro pages so you can see the result:
http://latexref.xyz/About-this-document.html

The <hr> and link at bottom were added by us, via this option:

-c PRE_BODY_CLOSE="<hr/><div class='referenceinfo'>\
<a href='https://latexref.xyz/'>\
<i>Unofficial LaTeX2e reference manual</i></a></div>"

Best,
Karl