This feature is not being brought to the new Unified Community Platform (UCP).
See Help:UCP for more information on the new platform.

You can include CSS and JavaScript customization that solely applies to the Chat feature.

Modifying chat for all users

All community-wide customization must abide by Fandom's policy on allowed customizations and the Terms of Use.

Custom CSS for chat can be applied for all users by editing MediaWiki:Chat.css.

Custom JavaScript for chat can be added for all users by editing MediaWiki:Chat.js. Note that this requires community JavaScript to be enabled, and any changes must be approved through the JavaScript review process.

Personal changes

You can also use your Personal CSS and JS to modify chat just for your personal account.

To modify your chat experience on a particular community, edit Special:MyPage/chat.css for CSS or Special:MyPage/chat.js for JavaScript on that community.

To modify your chat experience on all communities, edit Special:MyPage/global.css on Community Central. Global JavaScript modifications for chat are not currently active.

Further help and feedback

Community content is available under CC-BY-SA unless otherwise noted.