make4ht is removing blank lines from verbatim environment

Question

My LaTeX code file foo.tex: documentclass{article} usepackage{amsmath} title{Demo} begin{document} begin{verbatim} Foo Bar Baz end{verbatim} end{document} Here is how I convert it to HTML using make4ht: $ make4ht foo.tex [STATUS] make4ht: Conversion started [STATUS] make4ht: Input file: foo.tex [STATUS] make4ht: Conversion finished Here is how foo.html looks:

Foo
Bar
Baz

The blank lines in verbatim environment have been removed in the HTML output. As a result the output looks different from what it would look if I had compiled the .tex file to a .pdf. Is there a way to prevent make4ht from removing blank lines in verbatim environment?

michal.h21 · Answer

I think I've introduced this bug recently when I fixed another bug. I will fix it in TeX4ht immediately. Meanwhile, you can use the following configuration file, myconfig.cfg:

Preamble{xhtml}
Configure{verbatim}
{HCode{}}
{csname a:spendcsname}
begin{document}
EndPreamble

The Configure{verbatim} takes two parameters, the first one is code inserted at each line break, the second is a space character. csname a:spendcsname inserts non breaking space, which is necessary for correct indenting. HCode{} doesn't insert anything, but it forces tex4ht to insert line breaks at the correct places.

This was the HTML code before the change:

   <pre id='verbatim-1' class='verbatim'>
Foo
Bar 
Baz
</pre>

You can see that the linebreaks at the blank lines are missing.

Now compile your file with the configuration file:

make4ht -m draft -c myconfig.cfg filename.tex

You will get a correct HTML:

   <pre id='verbatim-1' class='verbatim'>
Foo

Bar

Baz
</pre>

Which is rendered like this:

Foo
Bar 
Baz

You can see that the linebreaks at the blank lines are missing. Now compile your file with the configuration file: make4ht -m draft -c myconfig.cfg filename.tex You will get a correct HTML:

Foo

Bar

Baz

Which is rendered like this:

make4ht is removing blank lines from verbatim environment

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