Deprecation: #92992 - Hook t3lib_parsehtml_proc.php:transformation 

See forge#92992

Description 

Since the deprecation of several internal functions in the \TYPO3\CMS\Core\Html\RteHtmlParser in TYPO3 10.2 (Deprecation: #86440 - Internal Methods and properties within RteHtmlParser) the hook t3lib/class.t3lib_parsehtml_proc.php:transformation became quite useless.

It is therefore marked as deprecated and will be removed with TYPO3 v12.

Impact 

Calling the hook will trigger a PHP E_USER_DEPRECATED error.

Affected Installations 

All installations with extensions installed that implement the hook.

Migration 

Migrate to use the public API only and use other options (such as allowAttributes) in order to only run certain instructions on the RteHtmlParser object.