How to change the DocType in the TYPO3 template setup. config.doctype = xhtml_11 config.xhtmlDoctype = xhtml_11 config.xmlprologue = none config.xhtml_cleaning = all The DOCTYPE can be set to these values: xhtml_trans (XHTML 1.0 Transitional doctype) xhtml_frames(XHTML 1.0 Frameset doctype) xhtml_strict (XHTML 1.0 Strict doctype) xhtml_basic (XHTML basic doctype) xhtml_11 (XHTML 1.1 doctype) xhtml_2 (XHTML 2 typo3-setting-xhtml-11-doctype/" class="more-link">More >