However, there is no guarantee of compatibility. For instance, MediaWiki 1.34 wikis using a ltsrel extension would usually use the REL1_31 branch of that extension. If you use a non-LTS version of MediaWiki, usually you will need to use the extension's branch for the previous LTS version.

if you use MediaWiki 1.39, you should use the REL1_39 branch of the extension.

long-term support release branches (key: ltsrel): For every MediaWiki release that is a Long Term Support release (see Version lifecycle release policy) there is a corresponding branch in the extension.

release branches (key: rel): For every MediaWiki release, there is a corresponding branch in the extension.

Back-compatibility hacks are added to the extension source code as needed.

master (key: master): the master branch of the extension is compatible with both current and older versions of MediaWiki.

As long as an extension is properly maintained (which you can see at the top of the infobox on its description page), the master branch of the extension should be compatible with the master branch of MediaWiki.įor determining compatibility with older MediaWiki versions, there are the following common policies used by extensions:

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