Add a URL parameter uselayout that selects the layout file to use.
- It should be persistent throughout the session (as in https://www.mediawiki.org/wiki/Extension:ChangeSessionSkin)
- It should not invalidate the cached skin
Add a URL parameter uselayout that selects the layout file to use.
Fixed in https://gerrit.wikimedia.org/r/#/c/273656/
Not implemented: Persistence throughout the session. Out of scope.