\usepackage{cancel} in html book

[yairmau]

Description

In a quarto html book, I need to write

$$ \cancel{abcd} $$

$$
\cancel{abcd}
$$

The preview works great, but when I render I get

compilation failed- error
Undefined control sequence.
l.203 \cancel
{abcd}

I tried writing the following in _quarto.yml, but this didn't work. Can someone please help?

format:
  html:
    include-in-header:
      - text: |
          \usepackage{cancel}

[cscheid]

compilation failed- error
Undefined control sequence.
l.203 \cancel

This is a PDF compilation error. You need to add the include in PDF format instead.

[yairmau]

this works, thanks! in the documentation (https://quarto.org/docs/output-formats/html-basics.html#includes) it doesn't say where to put "include-in-header". as I am making an html book, it thought it was supposed to go there, and it isn't clear to me what pdf has anything to do with it

[cderv]

as I am making an html book, it thought it was supposed to go there, and it isn't clear to me what pdf has anything to do with it

@yairmau I would suggest checking your _quarto.yml to see if you don't have a format: pdf key because Quarto should not try to render to PDF unless you ask for it.

See example of _quarto.yml with multiformat : https://quarto.org/docs/projects/quarto-projects.html#project-metadata
There are both html and pdf, and rendering the book with quarto render would render both

[mcanouil]

If you need to use special "package" in math HTML environment such as MathJax (default) or KaTeX, you need to configure the tool you are using to do so if it does support it.

There are several GitHub Discussions about this:

• https://github.com/quarto-dev/quarto-cli/discussions?discussions_q=mathjax