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+.. include:: ../../Includes.txt
+
+===================================================================
+Important: #95298 - Fluid Viewhelpers will be declared final in v12
+===================================================================
+
+See :issue:`95298`
+
+Description
+===========
+
+This is a notice for an upcoming change in TYPO3 v12:
+
+All Fluid Viewhelper classes delivered by core extensions will be declared
+:php:`final` in TYPO3 v12, third party extensions can no longer extend them
+with own variants.
+
+The core takes this step to clarify that single Viewhelpers are not part of the
+PHP API, their internal handling may change any time, which is not considered
+breaking. Fluid delivers a series of abstract classes to provide base functionality
+for common Viewhelper needs. Those can be used by third party viewhelpers if
+not marked :php:`@internal`. TYPO3 v12 will fine-tune these abstracts and may
+extract specific Viewhelper code to abstracts if the code is generally useful
+for extension developers with own View Helpers.
+
+Using Viewhelpers provided by core extensions in Fluid templates is of course
+fine as long as they are not marked :php:`@internal`. Arguments to casual Viewhelpers
+are considered API and are subject of the general core deprecation strategy. In
+general, the base extensions `EXT:fluid`, `EXT:core`, `EXT:frontend` and `EXT:backend`
+deliver various general purpose Viewhelpers that can be used, while specific extensions
+like `EXT:beuser` add :php:`@internal` Viewhelpers that should not be used in own templates.
+
+Developers are encouraged to adapt own Viewhelpers towards this change with
+v11 compatible extensions already, it will simplify compatibility with v12 later.
+
+.. index:: Fluid, PHP-API, ext:fluid