<..more html latex..>+
\pend:defI\@iinput{\egroup}
\let\o:iinput:=\@iinput
\def\@iinput{\bgroup \catcode‘\_=12 \o:iinput:}
-_-_-
<..more html latex..>+
\def\:tempc{\bgroup \catcode‘\_=12 \la:include}
\def\la:include#1{\egroup \o:include:{#1}}
\HLet\include\:tempc
-_-_-