Google Code-in

MediaWiki has an extension called MobileFrontend and a skin called Minerva-Neue. You can see them in action when you go to (for example) https://m.mediawiki.org/ instead of https://www.mediawiki.org/ (note the "m" instead of "www" in the URL).

For the diffs on the Special:MobileDiff special page, the icons vary based on the actor's name being a registered username or an unregistered IP address. And this is the same, regardless of whether the reading user of this information is logged-in or not.

However, on the history page, a logged-out user sees all actors with the red icon. And a logged-in viewer sees all actors with a grey/happy icon.

Please view more information about the task here: https://phabricator.wikimedia.org/T204910 as this task consist of graphics to properly understand the task, and explains what your software change (patch) has to cover, in order to be accepted. You are expected to provide a patch in Wikimedia Gerrit. See https://www.mediawiki.org/wiki/Gerrit/Tutorial for how to set up Git and Gerrit.