Feature: #108726 - Introduce Fluid f:render.contentArea ViewHelper 

Description 

Instead of using the <f:cObject> and <f:for> ViewHelpers to render content areas, the new <f:render.contentArea> ViewHelper can be used.

It allows rendering content areas while enabling other extensions to modify the output via PSR-14 EventListeners.

This is especially useful for adding debugging wrappers or additional HTML structure around content areas.

By default, the ViewHelper renders the content area as-is, but EventListeners can listen to the \TYPO3\CMS\Fluid\Event\ModifyRenderedContentAreaEvent and modify the output.

You need to use the PAGEVIEW config like this: .. code-block:: typoscript

page = PAGE page.10 = PAGEVIEW page.10.paths.10 = EXT:my_site_package/Resources/Private/Templates/

<f:render.contentArea contentArea="{content.left}"/>
or
{content.left -> f:render.contentArea()}

Impact 

Theme creators are encouraged to use the <f:render.contentArea> ViewHelper to allow other extensions to modify the output via EventListeners.