After I updated Tex Live 2021 last night, I am finding that tex4ht no longer shows horizontal lines in tables.
Why is that, and how to get them to show again?
Here is MWE
\documentclass[12pt]{book}
\begin{document}
\begin{tabular}{|c|c|}\hline
A & B \\\hline
C & D \\\hline
\end{tabular}
\end{document}
Compiled using
>make4ht -ulm default -a debug foo2.tex "htm"
[INFO] mkparams: Output dir:
[INFO] mkparams: Compiler: dvilualatex
[INFO] mkparams: Latex options: -jobname=foo2
[INFO] mkparams: tex4ht.sty: xhtml,htm,charset=utf-8
[INFO] mkparams: tex4ht: -cmozhtf -utf8
[INFO] mkparams: build_file: foo2.mk4
[INFO] mkparams: Output format: html5
[STATUS] make4ht: Conversion started
[STATUS] make4ht: Input file: foo2.tex
[INFO] mkutils: Load extension common_domfilters
[INFO] mkutils: Cannot open config file foo2.mk4
[INFO] make4ht-lib: setting param correct_exit
[INFO] make4ht-lib: setting param correct_exit
[INFO] make4ht-lib: setting param correct_exit
[INFO] make4ht-lib: setting param ext
[INFO] make4ht-lib: Adding: ext dvi
[INFO] htlatex: LaTeX call: dvilualatex --interaction=errorstopmode -jobname=foo2 '\makeatletter\def\HCode{\futurelet\HCode\HChar}\def\HChar{\ifx"\HCode\def\HCode"##1"{\Link##1}\expandafter\HCode\else\expandafter\Link\fi}\def\Link#1.a.b.c.{\g@addto@macro\@documentclasshook{\RequirePackage[#1,html]{tex4ht}}\let\HCode\documentstyle\def\documentstyle{\let\documentstyle\HCode\expandafter\def\csname tex4ht\endcsname{#1,html}\def\HCode####1{\documentstyle[tex4ht,}\@ifnextchar[{\HCode}{\documentstyle[tex4ht]}}}\makeatother\HCode xhtml,htm,charset=utf-8,html5.a.b.c.\input "\detokenize{foo2.tex}"'
This is LuaTeX, Version 1.13.2 (TeX Live 2021)
....
Execute script `foo2.lg'
[INFO] make4ht-lib: executing: t4ht "foo2.dvi"
----------------------------
t4ht.c (2018-07-04-14:25 kpathsea)
t4ht foo2.dvi
(/usr/local/texlive/2021/texmf-dist/tex4ht/base/unix/tex4ht.env)
Entering foo2.lg
Entering foo2.css
Entering foo2.tmp
[INFO] mkutils: Parse LG
[INFO] make4ht-lib: parse_lg process file: foo2.htm
[INFO] make4ht-lib: parse_lg process file: foo2.htm
[INFO] make4ht: outdir:
[INFO] make4ht-lib: parse_lg process file: foo2.css
[INFO] make4ht: outdir:
[INFO] make4ht-lib: parse_lg process file: foo2.tmp
[INFO] make4ht-lib: tmp file
[STATUS] make4ht: Conversion finished
>
Gives this HTML
The raw HTML it generated is
<!DOCTYPE html>
<html lang='en-US' xml:lang='en-US'>
<head><title></title>
<meta charset='utf-8' />
<meta content='TeX4ht (https://tug.org/tex4ht/)' name='generator' />
<meta content='width=device-width,initial-scale=1' name='viewport' />
<link href='foo2.css' rel='stylesheet' type='text/css' />
<meta content='foo2.tex' name='src' />
</head><body>
<div class='tabular'> <table class='tabular' id='TBL-1'><colgroup id='TBL-1-1g'><col id='TBL-1-1' /></colgroup><colgroup id='TBL-1-2g'><col id='TBL-1-2' /></colgroup><tr class='hline'><td></td><td></td></tr><tr id='TBL-1-1-' style='vertical-align:baseline;'><td class='td11' id='TBL-1-1-1' style='white-space:nowrap; text-align:center;'>A</td><td class='td11' id='TBL-1-1-2' style='white-space:nowrap; text-align:center;'>B</td></tr><tr class='hline'><td></td><td></td></tr><tr id='TBL-1-2-' style='vertical-align:baseline;'><td class='td11' id='TBL-1-2-1' style='white-space:nowrap; text-align:center;'> C </td> <td class='td11' id='TBL-1-2-2' style='white-space:nowrap; text-align:center;'>D</td>
</tr><tr class='hline'><td></td><td></td></tr></table>
</div>
</body>
</html>
But lualatex foo2.tex gives this PDF
>lualatex foo2.tex
This is LuaHBTeX, Version 1.13.2 (TeX Live 2021)
restricted system commands enabled.
(./foo2.tex
LaTeX2e <2021-06-01> patch level 1
L3 programming layer <2021-08-27>
(/usr/local/texlive/2021/texmf-dist/tex/latex/base/book.cls
Document Class: book 2021/02/12 v1.4n Standard LaTeX document class
(/usr/local/texlive/2021/texmf-dist/tex/latex/base/bk12.clo))
(/usr/local/texlive/2021/texmf-dist/tex/latex/l3backend/l3backend-luatex.def)
(./foo2.aux) (/usr/local/texlive/2021/texmf-dist/tex/latex/base/ts1cmr.fd)
[1{/usr/local/texlive/2021/texmf-var/fonts/map/pdftex/updmap/pdftex.map}]
(./foo2.aux))
406 words of node memory still in use:
3 hlist, 1 vlist, 1 rule, 2 glue, 3 kern, 1 glyph, 4 attribute, 48 glue_spec
, 4 attribute_list, 1 write nodes
avail lists: 2:58,3:4,4:1,5:23,6:2,7:112,8:1,9:56
</usr/local/texlive/2021/texmf-dist/fonts/opentype/public/lm/lmroman12-regular.
otf>
Output written on foo2.pdf (1 page, 3083 bytes).
Transcript written on foo2.log.
>
To verify, I compiled the same tex file on a Linux which I did not update texlive on. Using the same command as above. It gives there the correct output
>make4ht -ulm default -a debug foo2.tex "htm"
[INFO] mkparams: Output dir:
[INFO] mkparams: Compiler: dvilualatex
[INFO] mkparams: Latex options: -jobname=foo2
[INFO] mkparams: tex4ht.sty: xhtml,htm,charset=utf-8
[INFO] mkparams: tex4ht: -cmozhtf -utf8
[INFO] mkparams: build_file: foo2.mk4
[INFO] mkparams: Output format: html5
[STATUS] make4ht: Conversion started
[STATUS] make4ht: Input file: foo2.tex
[INFO] mkutils: Load extension common_domfilters
[INFO] mkutils: Cannot open config file foo2.mk4
[INFO] make4ht-lib: setting param correct_exit
[INFO] make4ht-lib: setting param correct_exit
[INFO] make4ht-lib: setting param correct_exit
[INFO] make4ht-lib: setting param ext
[INFO] make4ht-lib: Adding: ext dvi
[INFO] htlatex: LaTeX call: dvilualatex --interaction=errorstopmode -jobname=foo2 '\makeatletter\def\HCode{\futurelet\HCode\HChar}\def\HChar{\ifx"\HCode\def\HCode"##1"{\Link##1}\expandafter\HCode\else\expandafter\Link\fi}\def\Link#1.a.b.c.{\g@addto@macro\@documentclasshook{\RequirePackage[#1,html]{tex4ht}}\let\HCode\documentstyle\def\documentstyle{\let\documentstyle\HCode\expandafter\def\csname tex4ht\endcsname{#1,html}\def\HCode####1{\documentstyle[tex4ht,}\@ifnextchar[{\HCode}{\documentstyle[tex4ht]}}}\makeatother\HCode xhtml,htm,charset=utf-8,html5.a.b.c.\input "\detokenize{foo2.tex}"'
This is LuaTeX, Version 1.10.0 (TeX Live 2019)
restricted system commands enabled.
LaTeX2e <2020-02-02> patch level 5
L3 programming layer <2020-02-25> (./foo2.tex
(/usr/local/texlive/2019/texmf-dist/tex/latex/base/book.cls
Document Class: book 2019/12/20 v1.4l Standard LaTeX document class
(/usr/local/texlive/2019/texmf-dist/tex/latex/base/bk12.clo))
(/usr/local/texlive/2019/texmf-dist/tex/generic/tex4ht/tex4ht.sty)
(/usr/local/texlive/2019/texmf-dist/tex/generic/tex4ht/tex4ht.4ht
....
Execute script `foo2.lg'
[INFO] make4ht-lib: executing: t4ht "foo2.dvi"
----------------------------
t4ht.c (2018-07-04-14:25 kpathsea)
t4ht foo2.dvi
(/usr/local/texlive/2019/texmf-dist/tex4ht/base/unix/tex4ht.env)
Entering foo2.lg
Entering foo2.css
Entering foo2.tmp
[INFO] mkutils: Parse LG
[INFO] make4ht-lib: parse_lg process file: foo2.htm
[INFO] make4ht: outdir:
[INFO] make4ht-lib: parse_lg process file: foo2.css
[INFO] make4ht: outdir:
[INFO] make4ht-lib: parse_lg process file: foo2.tmp
[INFO] make4ht-lib: tmp file
[STATUS] make4ht: Conversion finished
The raw HTML on this system seems little different (did not yet check where the difference is)
<!DOCTYPE html>
<html lang="en-US" xml:lang="en-US" >
<head><title></title>
<meta charset="utf-8" />
<meta name="generator" content="TeX4ht (http://www.tug.org/tex4ht/)" />
<meta name="viewport" content="width=device-width,initial-scale=1" />
<link rel="stylesheet" type="text/css" href="foo2.css" />
<meta name="src" content="foo2.tex" />
</head><body
>
<div class="tabular"> <table id="TBL-1" class="tabular"
><colgroup id="TBL-1-1g"><col
id="TBL-1-1" /></colgroup><colgroup id="TBL-1-2g"><col
id="TBL-1-2" /></colgroup><tr
class="hline"><td><hr /></td><td><hr /></td></tr><tr
style="vertical-align:baseline;" id="TBL-1-1-"><td style="white-space:nowrap; text-align:center;" id="TBL-1-1-1"
class="td11">A</td><td style="white-space:nowrap; text-align:center;" id="TBL-1-1-2"
class="td11">B</td></tr><tr
class="hline"><td><hr /></td><td><hr /></td></tr><tr
style="vertical-align:baseline;" id="TBL-1-2-"><td style="white-space:nowrap; text-align:center;" id="TBL-1-2-1"
class="td11"> C </td> <td style="white-space:nowrap; text-align:center;" id="TBL-1-2-2"
class="td11">D</td>
</tr><tr
class="hline"><td><hr /></td><td><hr /></td></tr><tr
style="vertical-align:baseline;" id="TBL-1-3-"><td style="white-space:nowrap; text-align:center;" id="TBL-1-3-1"
class="td11"> </td>
</tr></table>
</div>
</body>
</html>
so something changed in tex4ht recently to cause this.
