Manual:$wgAllowRawHtmlCopyrightMessages

Language, regional and character encoding settings: $wgAllowRawHtmlCopyrightMessages
Whether on-wiki overrides for the copyright and history_copyright messages, which allow raw HTML, will be used.
Introduced in version:1.43.0 (Gerrit change 1075597; git #943d0890)
Deprecated in version:1.44.0 (Gerrit change 1146109; git #21428e42)
Removed in version:1.45.0 (Gerrit change 1145324; git #1bd761f9)
Allowed values:(boolean)
Default value:false (1.44)
true (1.43)

Details

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Whether on-wiki overrides for the copyright and history_copyright messages, which allow raw HTML, will be used.

If false, only the corresponding wikitext messages copyright-footer and copyright-footer-history will be used.