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The playpen was renamed to playground several years ago, but mdbook still had the old terminology. Notes about backwards compatibility:
output.html.playground
andoutput.html.playpen
are accepted in the config (though not both at the same time). Onlyplayground
is documented.{{#playpen}}
and{{#playground}}
are accepted as handlebar expressions, though{{#playpen}}
will display a warning about it being renamed.noplayground
andnoplaypen
language tags are both supported.This may impact books that have modified the "playpen" elements in the theme. This is also a minor API change.
Closes #674