3

When I compile this MWE in lualatex

\documentclass[11pt]{article}%
\usepackage{longtable}

\begin{document}    
This is my long table

\begin{longtable}{|c|c|}
\caption{my caption}\\\hline
A & B \\\hline
853.075 (sec) & 43.711 (sec)\\\hline
14.218 (minutes) & 0.729 (minutes)\\\hline
\end{longtable}

my long table is done    
\end{document}

The output comes as expected

Mathematica graphics

But using make4ht foo.tex -c my.cfg "htm" with my.cfg as

\Preamble{xhtml}
\Css{div.caption{text-align:center;}}
\begin{document}
\EndPreamble

The HTML output looks like this

Mathematica graphics

Notice the edge lines are too long.

If I remove the caption, then it is OK:

\documentclass[11pt]{article}%
\usepackage{longtable}    
\begin{document}    
This is my long table

\begin{longtable}{|c|c|}\hline 
A & B \\\hline
853.075 (sec) & 43.711 (sec)\\\hline
14.218 (minutes) & 0.729 (minutes)\\\hline
\end{longtable}

my long table is done    
\end{document}

And now compile using make4ht foo.tex "htm" then the output is OK, same as PDF

Mathematica graphics

If I use this .cfg file instead of the above

\Preamble{xhtml}
\Css{div.caption{text-align:center;}}
\Configure{float}{\csname par\endcsname\ShowPar}
{\ifvmode\IgnorePar\fi\EndP\HCode{<div class="float">}}
{\ifvmode\IgnorePar\fi\EndP\HCode{</div>}\ShowPar}
\begin{document}
\EndPreamble

On the first MWE shown above, then the output looks like this, where now the caption is inside the table itself

Mathematica graphics

Which is not too bad, I can live with this. It looks better than the first example with the extra edges there.

Is there an easy workaround to the caption above the table without the extra lines? as in the PDF output?

Using TL 2018 on linux

references: how-to-make-caption-be-centered-under-table-when-using-tex4ht

and

how-to-have-a-caption-on-top-of-longtable

3

The issue is that the caption is rendered as a row in a longtable. As you requested the borders for columns, you get a border also for the row with the caption. You can try the modified version of longtable.4ht, which prevents creation of the table row:

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% longtable.4ht                         2009-05-21-09:32 %
% Copyright (C) 1997--2009       Eitan M. Gurari         %
%                                                        %
% This work may be distributed and/or modified under the %
% conditions of the LaTeX Project Public License, either %
% version 1.3c of this license or (at your option) any   %
% later version. The latest version of this license is   %
% in                                                     %
%   http://www.latex-project.org/lppl.txt                %
% and version 1.3c or later is part of all distributions %
% of LaTeX version 2005/12/01 or later.                  %
%                                                        %
% This work has the LPPL maintenance status "maintained".%
%                                                        %
% This Current Maintainer of this work                   %
% is Eitan M. Gurari.                                    %
%                                                        %
% If you modify this program your changing its signature %
% with a directive of the following form will be         %
% appreciated.                                           %
%            \message{signature}                         %
%                                                        %
%                             gurari@cse.ohio-state.edu  %
%                 http://www.cse.ohio-state.edu/~gurari  %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\immediate\write-1{version 2009-05-21-09:32}

   \def\:tempc[#1]#2{%
  \gHAdvance\float:cnt  1
\gHAssign\capt:cnt0
\hbox{\def\flt:anchor{}\get:cptg}%
%
  \def\Clr{#2}\a:VBorder
\HAssign\ar:cnt0
\let\HAlign\empty
%
\def\aa:longtable{%
   \gdef\aa:longtable{\let\HRow\lt:sv
       \HAdvance\HRow by 1 \global\let\:MkHalign:\lt:MkHalign:}%
   \global\setbox\LT:box\vbox{\a:longtable}%
   \global\let\lt:MkHalign:\:MkHalign:}%
\def\bb:longtable{%
   \ifHCond \global\let\bb:longtable\empty
      \global\setbox\LT:ebox=\vbox{{\ht:everypar{}\leavevmode}\b:longtable}%
      \global\HCondfalse
   \fi}
%
  \refstepcounter{table}\stepcounter{LT@tables}%
  \if l#1%
    \LTleft\z@ \LTright\fill
  \else\if r#1%
    \LTleft\fill \LTright\z@
  \else\if c#1%
    \LTleft\fill \LTright\fill
  \fi\fi\fi
  \let\LT@mcol\multicolumn
  \let\LT@@tabarray\@tabarray
  \let\LT@@hl\hline
  \def\@tabarray{%
    \let\hline\LT@@hl
    \LT@@tabarray}%
  \let\\\LT@tabularcr\let\tabularnewline\\%
  \let\newpage\empty
\let\pagebreak\empty
\let\nopagebreak\empty
%
  \let\hline\LT@hline \let\kill\LT@kill\let\caption\LT@caption
  \@tempdima\ht\strutbox
  \let\@endpbox\LT@endpbox
  \ifx\extrarowheight\@undefined
    \let\@acol\@tabacol
    \let\@classz\@tabclassz \let\@classiv\@tabclassiv
    \def\@startpbox{\vtop\LT@startpbox}%
    \let\@@startpbox\@startpbox
    \let\@@endpbox\@endpbox
    \let\LT@LL@FM@cr\@tabularcr
  \else
    \advance\@tempdima\extrarowheight
    \col@sep\tabcolsep
    \let\@startpbox\LT@startpbox\let\LT@LL@FM@cr\@arraycr
  \fi
  \setbox\@arstrutbox\hbox{}%
  \let\@sharp##\let\protect\relax
   \begingroup
    \@mkpream{#2}%
    \xdef\LT@bchunk{%
       \global\advance\c@LT@chunks\@ne
       \global\LT@rows\z@\setbox\z@\vbox\bgroup
       \LT@setprevdepth
       \everycr{}\tabskip\LTleft\noexpand\MkHalign\noexpand\@sharp
   {\tabskip\z@ \@arstrut \@preamble \tabskip\LTright}%
}%
       \tmp:cnt=0
\global\let\:tempa\empty
\loop\ifnum \ar:cnt>\tmp:cnt
   \advance\tmp:cnt by 1
   \expandafter\ifx \csname @testpach \the\tmp:cnt\endcsname\relax
   \else
      \xdef\:tempa{%
          \:tempa
          \def \expandafter\noexpand
             \csname @testpach \the\tmp:cnt\endcsname{\csname @testpach
             \the\tmp:cnt\endcsname}}%
      \expandafter\let\csname @testpach \the\tmp:cnt\endcsname\relax
   \fi
\repeat
\aftergroup\:tempa
\xdef\:temp{%
   \def\noexpand\HAlign{\HAlign}%
   \def\noexpand\ar:cnt{\ar:cnt}}\aftergroup\:temp
%
  \endgroup
  \LT@cols\ar:cnt
%
  \LT@make@row
  \m@th\let\par\@empty
  \everycr{}\lineskip\z@\baselineskip\z@
  \ifx \EndPicture\:UnDef
     \SaveMkHalignConfig \ifx \recall:ar\:UnDef
   \edef\recall:ar{%
      \noexpand\ifx \noexpand\EndPicture\noexpand\:UnDef \noexpand\else
         \arrayrulewidth\the\arrayrulewidth
         \doublerulesep\the\doublerulesep
         \arraycolsep\the\arraycolsep
         \tabcolsep\the\tabcolsep
      \noexpand\fi }%
\fi
\arrayrulewidth\z@  \doublerulesep\z@
\arraycolsep\z@     \tabcolsep\z@
\Configure{MkHalign}
  \aa:longtable
  {\bb:longtable \ProperTrTrue}
  {\a:putHBorder\InitHBorder \ifProperTr{\c:longtable}}
  {\ifProperTr{\d:longtable}\a:putHBorder\InitHBorder}%
  {\ifProperTr{\e:longtable}\RecallMkHalignConfig\recall:ar}
  {\ifProperTr{\f:longtable}}
%
     \let\@sharp\relax
  \else \let\@sharp##\fi
  \LT@bchunk}
\HLet\LT@array\:tempc
\def\:tempc{%
  \crcr\LT@save@row\cr
  \ifx \EndPicture\:UnDef \EndMkHalign\else \egroup\fi
%
  \global\setbox\@ne\lastbox    \unskip
  \egroup}
\HLet\LT@echunk\:tempc
\let\:tempc\LT@startpbox
\append:defI\:tempc{\everypar{\HtmlPar}\a:longtableparbox}%
\HLet\LT@startpbox\:tempc
\NewConfigure{longtableparbox}{1}
\NewConfigure{longtable}{6}
\csname newbox\endcsname\LT:box
\csname newbox\endcsname\LT:ebox
\let\:tempc\LT@start
\pend:def\:tempc{%
  \ifvoid\LT@head\else
     \ifvoid\LT@firsthead
        \global\setbox\LT@firsthead=\hbox{\box\LT@head}%
     \else
        \global\setbox\tmp:bx=\hbox{\box\LT@head}%
  \fi\fi
  \box\LT:box}
\HLet\LT@start\:tempc
\let\:tempc\endlongtable
\append:def\:tempc{\box\LT:ebox}
\pend:def\:tempc{\global\HCondtrue}
\HLet\endlongtable\:tempc
\let\:tempc\LT@ntabularcr
\pend:def\:tempc{\global\let\lt:sv\HRow}
\HLet\LT@ntabularcr\:tempc
\let\:tempc\LT@end@hd@ft
\pend:defI\:tempc{\global\let\lt:sv\HRow}
\HLet\LT@end@hd@ft\:tempc
%\def\:tempc{\global\let\lt:sv\HRow}
%\HLet\LT@kill\:tempc
\def\LT@rebox#1\bgroup{%
  #1\bgroup
  \unskip
}
\let\:tempc\LT@kill
\pend:def\:tempc{\global\let\lt:sv\HRow}
\HLet\LT@kill\:tempc
\let\LT:argtabularcr\LT@argtabularcr
\def\:tempc{\global\let\lt:sv\HRow  \LT:argtabularcr}
\HLet\LT@argtabularcr\:tempc
\ifx \tmp:bx\:UnDef \csname newbox\endcsname \tmp:bx \fi
%\def\:tempc{\LT@end@hd@ft\tmp:bx}
%\HLet\endhead\:tempc
% \def\:tempc{\LT@end@hd@ft\tmp:bx}
% \HLet\endfoot\:tempc
\pend:def\LT@output{%
  \ifvoid\LT@foot\else
     \ifvoid\LT@lastfoot
        \global\setbox\LT@lastfoot=\hbox{\box\LT@foot}%
     \else
        \global\setbox\tmp:bx=\hbox{\box\LT@foot}%
  \fi\fi
}
\def\:tempc{\global\HCondtrue \LT@end@hd@ft\LT@lastfoot}
\HLet\endlastfoot\:tempc

   \def\:tempc{%
  \o:noalign:{\ifnum0=`}\fi
    \penalty\@M
    \futurelet\@let@token\LT@@hline}
\HLet\LT@hline\:tempc
\def\:tempc{%
  \ifx\@let@token\hline
    \global\let\@gtempa\@gobble
    \gdef\LT@sep{\penalty-\@medpenalty\vskip\doublerulesep}%
  \else
    \global\let\@gtempa\@empty
    \gdef\LT@sep{\penalty-\@lowpenalty\vskip-\arrayrulewidth}%
  \fi
  \ifnum0=`{\fi}%
  \a:hline
%
  \o:noalign:{\penalty\@M}%
  \@gtempa}
\HLet\LT@@hline\:tempc

   \def\:tempc{%
  \o:noalign:\bgroup \gHAdvance\TitleCount  1
    \bgroup\@ifnextchar[{\egroup\LT@c@ption\@firstofone}\LT@capti@n}
\HLet\LT@caption\:tempc
\NewConfigure{longtabcaption}{4}
\def\:tempc#1#2#3{%
\a:longtabcaption#1{\cap:ref{#2}}\b:longtabcaption#3\c:longtabcaption\egroup}
\Configure{longtabcaption}{\ifvmode\IgnorePar\fi\HCode{<caption id=""><strong>}}{\HCode{:</strong> }}{\HCode{</caption>}}

%  \LT@mcol\LT@cols c{\hbox{\parbox[t]\LTcapwidth{%
%       \cptA: #1{\cap:ref{#2}}\cptB:\cptC:#3\cptD:
%    \endgraf\vskip\baselineskip}}}}
\HLet\LT@makecaption\:tempc

\Hinput{longtable}
\endinput

It has it's issues, so I don't think we will use this in tex4ht by default, but it may work for you.

The result:

enter image description here

HTML code:

 <!--l. 8--><div class="longtable"> <table id="TBL-1" class="longtable" 
cellspacing="0" cellpadding="0"  
><colgroup id="TBL-1-1g"><col 
id="TBL-1-1" /></colgroup><colgroup id="TBL-1-2g"><col 
id="TBL-1-2" /></colgroup>
   <caption id=""><strong>Table 1:</strong> my caption</caption>

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