**General info about the project**
ReferencePreviews will be realized through [[ https://www.mediawiki.org/wiki/Extension:Popups | the Popups extension ]] which is already used in production by page previews.
**Needed for beta deployment of the extensions:**
 Help page
[x] beta sites: Done in T213415#4905532
 test wikis
 First other wikis
ReferencePreviews was the [[ https://meta.wikimedia.org/wiki/WMDE_Technical_Wishes/Survey_Results | #1 wish of the 2017 German-speaking Technical Wishes survey ]]