Manual:$wgValidateAllHtml

Tidy: $wgValidateAllHtml
Validate the overall output using tidy and refuse to display the page if it's not valid.
Introduced in version:1.12.0 (r31044)
Removed in version:1.31.0 (Gerrit change 425093; git #0da97e7a)
Allowed values:(boolean)
Default value:false

Details edit

Validate the overall output using tidy and refuse to display the page if it's not valid.