Breaking: #72492 - Removed XHTML2 support
See forge#72492
Description
The support for XHTML2 documents in the TYPO3 Frontend has been removed.
Impact
The TypoScript option config.
has no effect anymore.
Affected Installations
Any TYPO3 instance using XHTML2 for frontend rendering.
Migration
Disable all header code and set your own doctype.