Manual:$wgResourceLoaderClientPreferences

Skins: $wgResourceLoaderClientPreferences
Enable client-side preferences for unregistered users.
Introduced in version:1.40.0 (Gerrit change 881728; git #d4d6156c)
Removed in version:still in use
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.