Not possible use a newer version of Mathjax

[piiskop]

MathJax has some packages optional. One of them is gensymb that can't be loaded via \require. If i still do \require{gensymb} then i see the message in the browser's console that says:

GET https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.9/extensions/TeX/gensymb.js?V=2.7.9 net::ERR_ABORTED 404

First thing to notice here is that an outdated version of MathJax will be referenced automatically. The current version should be 3.

The second thing to notice is that gensymb.js isn't available at the given address. So i followed the instruction at MathJax's homepage by adding these two snippets into my JS file that i use for adding elements to the page and there was no change in the outcome. i also have a current address inside _output.yml:

bookdown::bs4_book:
  css: style.css
  includes:
    in_header: js.html
  repo: https://github.com/piiskop/manual-for-rstudio
  math_method: 
    engine: mathjax
    url: https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-chtml-full.js

That current address won't be used as i see in the console that it still tries to access the version 2.7.9.

As here is requested the session info i add it:

xfun::session_info('bookdown')

R version 4.2.1 (2022-06-23)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 20.04.4 LTS, RStudio 2022.2.2.485

Locale:
LC_CTYPE=et_EE.UTF-8 LC_NUMERIC=C LC_TIME=et_EE.UTF-8 LC_COLLATE=et_EE.UTF-8 LC_MONETARY=et_EE.UTF-8 LC_MESSAGES=et_EE.UTF-8 LC_PAPER=et_EE.UTF-8
LC_NAME=C LC_ADDRESS=C LC_TELEPHONE=C LC_MEASUREMENT=et_EE.UTF-8 LC_IDENTIFICATION=C

Package version:
base64enc_0.1.3 bookdown_0.27.3 bslib_0.4.0 cachem_1.0.6 digest_0.6.29 evaluate_0.15 fastmap_1.1.0 fs_1.5.2 glue_1.6.2 graphics_4.2.1 grDevices_4.2.1 highr_0.9
htmltools_0.5.3 jquerylib_0.1.4 jsonlite_1.8.0 knitr_1.39 magrittr_2.0.3 memoise_2.0.1 methods_4.2.1 R6_2.5.1 rappdirs_0.3.3 rlang_1.0.4 rmarkdown_2.14 sass_0.4.2
stats_4.2.1 stringi_1.7.8 stringr_1.4.0 tinytex_0.40 tools_4.2.1 utils_4.2.1 xfun_0.31 yaml_2.3.5

[cderv]

There are two issues in one here:

• R Markdown ecosystem uses mathjax 2.7 by default - we recently updated to latest 2.7.9 in Update gitbook and bs4_book templates to use latest version of MathJax 2.7 from cdnjs #1355 waiting for our CDN version to be updated Update to latest release of MathJax 2.7 rstudio#11535

For context, Mathjax 2 is still used by default because switching to 3 would break some existing content. Example of breakage possible: mathjax/MathJax#2312 but there will be others probably.

• However, it should be possible to use custom mathjax. It was made possible recently in rmarkdown, but maybe we have an issue in bookdown that does not make it work despite our recent change. Possibly related to Custom MathJax URL not working #915 which require a not-so-small rewrite of this code part.

Thanks for the report, we'll look into this.

[cderv]

FWIW mathjax.rstudio.com/latest has been updated to 2.7.9

[piiskop]

404 Not Found
Code: NoSuchKey
Message: The specified key does not exist.
Key: 2.7.9/undefined
RequestId: 3PX5WCH9W8AREG1S
HostId: 7+Nbzy3TQOq5WIO6BptIomauMTQIQ41cWznTzaCrcKt4kZqDfcjcvBY7er/pzkFEgtByUiKo8B4=

[cderv]

@piiskop what did you try ? What does sharing this means ? There is unfortunately no contest to what you share in your latest comment.

If you are looking for the full mathjax url hosted and used by default with R Markdown, it will be https://mathjax.rstudio.com/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML

[piiskop]

I clicked the link in your response. What do you mean by sharing this? I did not write anything like that.

[yihui]

@piiskop I think he was telling you that the latest version of MathJax on mathjax.rstudio.com had been updated to 2.7.9. The link mathjax.rstudio.com/latest itself is invalid (hence you got the error mentioned in your reply), and the full valid link is in his next reply. By "sharing this", he meant that you shared an error message, but he had no idea about the context (how you ran into that error).