Manual:$wgHtml5Version

Output: $wgHtml5Version
Defines the value of the version attribute in the ‎<html> tag, if any.
Introduced in version:1.16.0 (r59033)
Removed in version:Still in use
Allowed values:(string) or null
Default value:null

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Defines the value of the version attribute in the ‎<html> tag, if any.

If you use RDFa, the possible values are:

  • HTML+RDFa 1.0
  • XHTML+RDFa 1.0

Starting with MW 1.27.0 you don't need to specify this setting if you want to use RDFa, since it's enabled by default.