Deprecation: #24387 - TypoScript option config.xhtmlDoctype=xhtml_2

See Issue #24387

Description

The TypoScript option config.xhtmlDoctype = xhtml_2 is marked for removal in CMS 8, due to the W3C decision to fully work on HTML5 instead of XHTML2. See http://www.w3.org/MarkUp/ and http://www.w3.org/News/2010.html#entry-8982 for more details.

Affected installations

Any TYPO3 installation with TypoScript that relies on config.xhtmlDoctype = xhtml_2.

Migration

Use other doctypes like html5 to render the frontend of the TYPO3 site.