--- title: "Page.headerData ViewHelper " manual: "Fluid ViewHelper Reference" version: "main" permalink: "https://docs.typo3.org/permalink/t3viewhelper:typo3-fluid-page-headerdata@main" source: "Global/Page/HeaderData.rst" modified: "2026-09-17T05:12:06+00:00" --- # Page.headerData ViewHelper `` > [!NOTE] > **New in version 14.0** The `` ViewHelper allows injecting arbitrary content into the HTML `` of a rendered page. The ViewHelper internally uses the [PageRenderer API](https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/ApiOverview/Assets/Index.html#assets-page-renderer) and is useful when ViewHelpers like [\](https://docs.typo3.org/permalink/t3viewhelper:typo3-fluid-asset-css@main) or [\](https://docs.typo3.org/permalink/t3viewhelper:typo3-fluid-asset-script@main) 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)](https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/Security/TypesOfThreats/Index.html#security-xss) > vulnerability. Go to the source code of this ViewHelper: [Page\\HeaderDataViewHelper.php (GitHub)](https://github.com/TYPO3/typo3/blob/main/typo3/sysext/fluid/Classes/ViewHelpers/Page/HeaderDataViewHelper.php). **Table of contents** - [Example usage](https://docs.typo3.org/permalink/t3viewhelper:example-usage@main) - [Arguments of the ViewHelper](https://docs.typo3.org/permalink/t3viewhelper:arguments-of-the-f-page-headerdata-viewhelper@main) ## Example usage **packages/my_sitepackage/Resources/Private/Templates/Page/Default.fluid.html** ```html ``` ## Arguments of the `` ViewHelper