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Custom playground for another language can be achieved through theme customization,
but the customization points are difficult and not documented.
This document gathers the existing workaround at #1453 and my trial.
In my environment (https://doc.veryl-lang.org/book/), the way described in this document achieved editable, syntax highlighted playground for my language.
I think some points seem to be hacky (ex.
editor.js
replacing).It may be able to be simplified by mdBook's official support.
Related: #350 #1759