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The build fails to complete with: ! Undefined control sequence. \f:HBorder ...border-top:1px solid \#\hline:color=20 ;"> l.867 R ead / Write & Device Specific & \\ ?=20 ! Emergency stop. \f:HBorder ...border-top:1px solid \#\hline:color=20 The final result is an empty html file. I verified this was a regression by running the same build on Bookworm using distrobox. It also works with the latest Ubuntu. I confirmed it fails on the latest=20 texlive image: =F0=9F=93=A6[alex@texlive virtio-spec.git]> htlatex --version This is pdfTeX, Version 3.141592653-2.6-1.40.28 (TeX Live 2025) (preloade= d format=3Dlatex) I've created a minimal test case that triggers the problem: --8<---------------cut here---------------start------------->8--- \documentclass{article} \usepackage{hhline} \begin{document} \begin{tabular}{ |l||l|l| } \hline Bits & Device Specific & Purpose \\ \cline{1-2} Read / Write & Device Specific & \\ \cline{1-2} Purpose & Device Specific & \\ \hline \end{tabular} \end{document} --8<---------------cut here---------------end--------------->8--- save as test.tex and run: htlatex test.tex I'm aware make4ht is an alternative which fails with a slightly different set of errors: =F0=9F=93=A6[alex@texlive virtio-spec.git]> make4ht test.tex "html5" [STATUS] make4ht: Conversion started [STATUS] make4ht: Input file: test.tex [ERROR] htlatex: Compilation errors in the htlatex run [ERROR] htlatex: Filename Line Message [ERROR] htlatex: ./test.tex ? Undefined control sequence. [STATUS] htlatex: <- ;"> l.8 R ead / Write & Device Specific & \\ = The control sequence at the end of the top line [ERROR] htlatex: ./test.tex ? Undefined control sequence. [STATUS] htlatex: <- ;"> l.8 R ead / Write & Device Specific & \\ = The control sequence at the end of the top line [ERROR] htlatex: ./test.tex ? Undefined control sequence. [STATUS] htlatex: <- ;"> l.10 P urpose & Device Specific & \\ The = control sequence at the end of the top line [ERROR] htlatex: ./test.tex ? Undefined control sequence. [STATUS] htlatex: <- ;"> l.10 P urpose & Device Specific & \\ The = control sequence at the end of the top line [ERROR] htlatex: Compilation errors in the htlatex run [ERROR] htlatex: Filename Line Message [ERROR] htlatex: ./test.tex ? Undefined control sequence. [STATUS] htlatex: <- ;"> l.8 R ead / Write & Device Specific & \\ = The control sequence at the end of the top line [ERROR] htlatex: ./test.tex ? Undefined control sequence. [STATUS] htlatex: <- ;"> l.8 R ead / Write & Device Specific & \\ = The control sequence at the end of the top line [ERROR] htlatex: ./test.tex ? Undefined control sequence. [STATUS] htlatex: <- ;"> l.10 P urpose & Device Specific & \\ The = control sequence at the end of the top line [ERROR] htlatex: ./test.tex ? Undefined control sequence. [STATUS] htlatex: <- ;"> l.10 P urpose & Device Specific & \\ The = control sequence at the end of the top line [ERROR] htlatex: Compilation errors in the htlatex run [ERROR] htlatex: Filename Line Message [ERROR] htlatex: ./test.tex ? Undefined control sequence. [STATUS] htlatex: <- ;"> l.8 R ead / Write & Device Specific & \\ = The control sequence at the end of the top line [ERROR] htlatex: ./test.tex ? Undefined control sequence. [STATUS] htlatex: <- ;"> l.8 R ead / Write & Device Specific & \\ = The control sequence at the end of the top line [ERROR] htlatex: ./test.tex ? Undefined control sequence. [STATUS] htlatex: <- ;"> l.10 P urpose & Device Specific & \\ The = control sequence at the end of the top line [ERROR] htlatex: ./test.tex ? Undefined control sequence. [STATUS] htlatex: <- ;"> l.10 P urpose & Device Specific & \\ The = control sequence at the end of the top line [STATUS] make4ht: Conversion finished Running the same command on Debian Bookworm yields: =F0=9F=93=A6[alex@debian-bookworm virtio-spec.git]> make4ht test.tex "htm= l5" [STATUS] make4ht: Conversion started [STATUS] make4ht: Input file: test.tex [STATUS] make4ht: Conversion finished For references the working versions are: =F0=9F=93=A6[alex@debian-bookworm virtio-spec.git]> make4ht --version make4ht version v0.3l =F0=9F=93=A6[alex@debian-bookworm virtio-spec.git]> htlatex --version This is pdfTeX, Version 3.141592653-2.6-1.40.24 (TeX Live 2022/Debian) (p= reloaded format=3Dlatex) Any suggestions? Thanks, --=20 Alex Benn=C3=A9e Virtualisation Tech Lead @ Linaro