Tabs turn into spaces in embedded HTML <pre> tag

[borisvassilev]

This might be related to #2804, or not at all. I can't say if it a regression this time. Again, easy to reproduce, but not so easy to notice, or to show: GitHub does something weird with tabs, too. I attach the two files from this command:

$ pandoc foo.txt >foo.html.txt

Opening both with a browser should make it obvious.

PS. From what I understand, really all white space is supposed to be preserved in a <pre> tag.

foo.txt
foo.html.txt

[borisvassilev]

Hmm, it seems that I am not able to figure out the "attach files" thing here. It is trivial to reproduce, anyway. This input file should be enough:

<pre>
a [tab character here] b
</pre>

[borisvassilev]

Note: an embedded 	 in the markdown portion of a document actually does get converted to a single tab character in the output:

$ cat bar.txt
	some text 
$ pandoc bar.txt
<p> some text</p>

Again, GitHub doesn't show this correctly, but between the opening <p> and some text there is a single tab character in the output of Pandoc.

Tab characters (not character entities) become spaces.

[jgm]

Pandoc, like most Markdown processors, expands all tabs with a 4-space tab stop before parsing.
Even in code blocks.

CommonMark is an exception, so you could try -f commonmark if you don't need pandoc-specific extensions.

[jgm]

I'm sorry, I'd forgotten to mention the --preserve-tabs option!