---
title: "Deprecation: #89742 - Form mixins"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:deprecation-89742"
source: "Changelog/10.2/Deprecation-89742-FormMixins.rst"
modified: "2026-09-15T10:46:36+00:00"
---

# Deprecation: #89742 - Form mixins

See [forge#89742](https://forge.typo3.org/issues/89742)

## Description

All mixins in the "form" extension have been deprecated and should not be used anymore. This affects all inheritances from `TYPO3.CMS.Form.mixins.*`.

The mixins have been deprecated with TYPO3v10 and will be removed with TYPO3v11.

## Impact

Form setup inheriting mixins from `TYPO3.CMS.Form.mixins.*` will trigger a deprecation warning in TYPO3v10.

With TYPO3v11 these mixins will be removed which will lead to an error.

## Affected Installations

Instances using the "form" extension and inheriting from `TYPO3.CMS.Form.mixins.*` in their form setup.

## Migration

Embed the essential parts from `TYPO3.CMS.Form.mixins.*` or migrate them to custom mixins.