`header-includes` works but `includes: in_header` does not about oxforddown HOT 4 CLOSED

Thanks for this, I just added the float package back in!

For now, I still assume that there is no need to explicitly include the other kableExtra packages in the template anymore because they are automatically added to the preamble when using library(kableExtra) given the change in the templates (we'll see if this turns out to be a poor decision 🤪 )

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I think you're right that this is a templating thing - are you able to dig out the latex template that's used by bookdown-demo and see how

output:
  bookdown::pdf_book:
    includes:
      in_header: "preamble.tex"

gets included?

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Solved - I just needed to added this to the templates

$for(header-includes)$
$header-includes$
$endfor$

This should have solved both use cases, i.e. header-includes and in_header. Can you check if it's working for you now if you fork the latest version?

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Thanks for looking into it!

When running the current version, I get ! LaTeX Error: Unknown float option 'H'.

This is fixed when adding \usepackage{float}, which it looks like you removed with the other kableExtra packages.

Note also that I had to update kableExtra to 1.3.4.9000 in order for the tables to render properly (I forgot to check what version I had previously).

However, once those things are fixed, in_header now works for my preamble.tex 👍.

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