The Popups extension displays popups with summaries of article contents when the user hovers over an article link.
This is an initiative of the Design team, to move popular Gadgets into Beta Features. Mockups and more information available at - https://www.mediawiki.org/wiki/Beta_Features/Hovercards
Extension: https://www.mediawiki.org/wiki/Extension:Popups
Bugzilla: https://bugzilla.wikimedia.org/buglist.cgi?component=Popups
Gerrit: https://gerrit.wikimedia.org/r/#/admin/projects/mediawiki/extensions/Popups
Design Discussion: https://www.mediawiki.org/wiki/Talk:Beta_Features/Hovercards
Version: unspecified
Severity: enhancement
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=26587