Breaking: #72492 - Removed XHTML2 support

See Issue #72492

Description

The support for XHTML2 documents in the TYPO3 Frontend has been removed.

Impact

The TypoScript option config.doctype = xhtml_2 has no effect anymore.

Affected Installations

Any TYPO3 instance using XHTML2 for frontend rendering.

Migration

Disable all header code and set your own doctype.