Open Table

<..HTable..>+
 \def\HT:ble{\bgroup  \let\sv:row=\HRow  \let\sv:col=\HCol
    \gHAssign\HRow=1 \gHAssign\HCol=0
    \htbl: }
 -_-_-

<..HTable..>+
 \def\htbl:{%
    \let\GetInt=\Get:Int
    \let\GetArg=\Get:Arg    \a:HTable
    <.script at start of tables.>%
    \c:HTable\hfil\break
    \ht:everypar{}\futurelet\:temp\tbl:bd }
 \NewConfigure{HTable}{6}
 -_-_-

<..HTable..>+
 \def\EndHTable{%
    \end:cell  \d:HTable   \b:HTable
    \global\let\HRow=\sv:row  \global\let\HCol=\sv:col  \egroup
    <.nullify script.>}
 -_-_-

<..HTable..>+
 \def\tbl:bd{\ifx \:temp\bgroup  \let\tbl:typ=\tbl:bdy
    \else    \ifx /\:temp        \def\tbl:typ##1{\env:tbl}%
    \else  \let\tbl:typ=\env:tbl
    \fi \fi \tbl:typ }
 \long\def\tbl:bdy#1{%
    \def\hfil{\ifx \EndPicture\:UnDef \space \else\:hfil\fi}%
    \def\hfill{\ifx \EndPicture\:UnDef \space \else\:hfill\fi}%
    \expandafter\let\csname cr\endcsname=\:cr
    \:HTable#1&\EndH:Table }
 \let\:hfil=\hfil
 \let\:hfill=\hfill
 -_-_-

Without the restructuring of the hfil’s TeX4ht gets cofused and looses spaces between words.