OpenOffice writer

<..configure html4 writer ..>

\Configure{WriterEnv}
    {%
      \ConfigureEnv{#1}
         {\ifvmode \IgnorePar\fi \EndP \HCode{<div class="#1">}}
         {\ifvmode \IgnorePar\fi \EndP \HCode{</div>}}
         {}{}%
    }
    {%
        \tmp:dim=\parindent
        \divide\tmp:dim by \ten:Em\relax
        \tmp:dim=10\tmp:dim
      \Css{div.#1 {text-indent:\expandafter\x:Em \the\tmp:dim em;}}%
        \tmp:dim=\leftskip
        \divide\tmp:dim by \ten:Em\relax
        \tmp:dim=10\tmp:dim
      \Css{div.#1 {margin-left:\expandafter\x:Em \the\tmp:dim em;}}%
        \tmp:dim=\rightskip
        \divide\tmp:dim by \ten:Em\relax
        \tmp:dim=10\tmp:dim
      \Css{div.#1 {margin-right:\expandafter\x:Em \the\tmp:dim em;}}%
      \Css{div.#1 {margin-top:0.75em;
                   margin-bottom:0.75em;
          }}%
}
<.10 em constant .>

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<..10 em constant ..>

{
   \def\x:Em{%
     \catcode‘\p=12
     \catcode‘\t=12
     \gdef\x:Em}
   \x:Em#1pt{#1}
}
\tmp:dim=10em
\edef\ten:Em#1.#2//{#1}
\edef\ten:Em{\expandafter\ten:Em \the\tmp:dim//}

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9.14 OpenOffice writer