\input TeX4ht.sty
\Preamble{html,sty}      \EndPreamble

\List{1}
\item        My heart is not haughty,
\item        nor mine eyes lofty:
\item        neither do I exercise
  \List{A}
    \item    myself in great matters,
    \item    or in things too
  \EndList
\EndList

\bye