Topic on User talk:Clump/Flow

Seems ok.

Why do you delete this page?

This hook seems to be used by several extensions, for example Extension:Expiry — MediaWiki.

See also:

• Category:MWStakeCommonUIRegisterSkinSlotComponents extensions — MediaWiki
• \bMWStakeCommonUIRegisterSkinSlotComponents(Hook)?\b - MediaWiki Codesearch (Extensions))

Because it an IP-created page that consisted of an irrelevant image link and some nonsense wikitext. If you want to create it with actual content feel free.

I just added a template "undocumented hook", see Manual:Hooks/MWStakeCommonUIRegisterSkinSlotComponents - MediaWiki. Is it ok for you?