Manual:$wgResourceLoaderClientPreferences

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Skins: $wgResourceLoaderClientPreferences
Enable client-side preferences for unregistered users.
Introduced in version:1.40.0 (Gerrit change 881728; git #d4d6156c)
Removed in version:1.41.0 (Gerrit change 947480; git #c7ee0dbf)
Allowed values:Unspecified
Default value:false
Warning Warning: EXPERIMENTAL!

Enable client-side preferences for unregistered users. This is only supported for unregistered users. For registered users, skins and extensions must use user preferences (e.g. hidden or API-only options) and swap class names server-side through the skin interface.