:navigation-title: page.headerData .. include:: /Includes.rst.txt .. _typo3-fluid-page-headerdata: ================================================ Page.headerData ViewHelper `` ================================================ .. versionadded:: 14.0 The `` ViewHelper allows injecting arbitrary content into the HTML :php:`` of a rendered page. The ViewHelper internally uses the `PageRenderer API `_ and is useful when ViewHelpers like ` `_ or ` `_ do not support all required attributes or use cases (for example `dns-prefetch`, `preconnect`, tracking scripts, or inline JavaScript). .. warning:: The ViewHelper outputs given content as is. Possible user supplied input for the ViewHelpers **must manually be escaped** in order to prevent a `Cross-site scripting (XSS) `_ vulnerability. .. typo3:viewhelper:: page.headerData :source: ../../Global.json :display: tags,gitHubLink .. rubric:: Example usage .. literalinclude:: _codesnippets/_HeaderData.html