[x] [[ https://deployment.wikimedia.beta.wmflabs.org/wiki/Main_Page | Beta Cluster ]]
[x] [[ https://meta.wikimedia.org/wiki/Wikimedia_wikis#Test_Wikis | Test wikis ]]
[x] [[ https://test2.wikipedia.org/wiki/Main_Page | test2wiki ]]
[x] [[ https://test.wikipedia.org/wiki/Main_Page | testwiki ]]
[x] [[ https://test.wikidata.org/wiki/Wikidata:Main_Page | testwikidata ]]
[x] testcommonswiki
[x] The rest of Group 0
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[x] Write new [[https://www.mediawiki.org/wiki/Extension:TimedMediaHandler/VideoJS_Player?useskin=vector | documentation page]] for community about the change (DJ)
[x] Send out Mass Message (Amir)
[x] Add note in Tech News (Amir)
[x] Monitor for new errors (Jon and Amir) and capture and document community feedback (Olga)
[x] Early adopters group batch 1 desktop-improvements (early March) dewikivoyage, euwiki, frwiktionary, hewiki, ptwikiversity, srwiki, Viwikibooks
[x] Early adopters group batch 2 desktop-improvements (Kowiki, viwiki, fawiki, frwiki (TBC) )
[ ] All desktop-improvements wikis
[ ] Wiktionary wikis
[ ] Commons
[ ] The rest of Group 1
[ ] All remaining wikis