We decided to use OOUI instead for core, and remove the global `$wgUseMediaWikiUIEverywhere`, [[ https://codesearch.wmcloud.org/search/?q=wgUseMediaWikiUIEverywhere&i=nope&files=&repos= | CodeSearch]].
Current core code documentation:
```lang=php
/**
* Temporary variable that applies MediaWiki UI wherever it can be supported.
* Temporary variable that should be removed when mediawiki ui is more
* stable and change has been communicated.
* @since 1.24
*/
$wgUseMediaWikiUIEverywhere = false;
```
**Status Sept 2020, MW core v1.36:**
| Repo | Setting
| -- | --
| core | `false`
| MobileFrontend | `true`
| edwardspec / mediawiki-moderation | `false` (to override MF)
| extensions / CookieWarning | `true` but just for hooks test
| Nikerabbit / mediawiki-extensions-Ainut | `true`
| skins / WikimediaApiPortal | `true` but only referred to in docs
| skins / BlueSpiceCalumma | `true`
== Steps
[] Deprecate global
[] Remove it in used repositories
[] Remove it
[]
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