Question: how can I activate Flexmark-java's attributes extension?

[hmf]

I am trying to activate the extension as indicates in the documentation. The link to the documentation does not seem to help because I cannot find the strings as shown in the documentation example, for this particular case. I looked at this for guidance, but that link is dead. I also searched the Flexmark-java git repo with no success. The goal is to use this extension.

Here is what I have in my configuration file:

markdown.extensions=FOOTNOTES,FENCED_CODE_BLOCKS,ATTRIBUTES

And I have this in my markdown file:

use{.span}

and I get the same text out verbatim.

On the same note. Assuming I have activated the extension, how do I set parameters such as FENCED_CODE_INFO_ATTRIBUTES to true?

TIA

[hmf]

Just had the idea to use the ALL. That did not work either. This extension seems to exists since 2017, so I don't think it is an issue with version.

Forgot to mention that I am using JBake version 2.6.7

[hmf]

Seems lime it is a bug in Flexmark. See vsch/flexmark-java#509.