Could you link to the Java/Python docs that allow downloading? Thanks

Additionally, using the browser option to save as pdf wouldn't suffice?

Just to be clear, it is possible to use godoc to view documentation without internet and that is something that pkgsite does not support, see #59056

Could you link to the Java/Python docs that allow downloading? Thanks

Additionally, using the browser option to save as pdf wouldn't suffice?

The relevant links are as follows.
https://www.oracle.com/java/technologies/javase-jdk17-doc-downloads.html
https://docs.python.org/3/download.html

These are very convenient for referring to the documents offline.

And Dart, another language of Google, supports downloading of documentation. This is the related link:
https://dart.dev/get-dart/archive

As mentioned in the bug linked to above, there is a version of pkgsite for local viewing
go install golang.org/x/pkgsite/cmd/pkgsite@latest
Can you say why that is not sufficent?

As mentioned in the bug linked to above, there is a version of pkgsite for local viewing Can you say why that is not sufficent?go install golang.org/x/pkgsite/cmd/pkgsite@latest

Its disadvantage is that you have to manually start a service every time you open the reference documentation. If it's a static HTML file, there's no need for deployment, and you can browse it directly by clicking to open it. You can download the html files from the link above and try it, if you cannot understand.

you can generate with Doc2Go:

https://github.com/abhinav/doc2go

it also supports generating different versions of a module

you can generate with Doc2Go:

abhinav/doc2go

it also supports generating different versions of a module

Thank you. It's the best solution.