Deprecation: #90421 - DocumentTemplate 

See forge#90421

Description 

The PHP class \TYPO3\CMS\Backend\Template\DocumentTemplate, also available as $GLOBALS['TBE_TEMPLATE'] until TYPO3 v10.0 served as a basis to render backend modules or HTML-based output in TYPO3 Backend.

Since TYPO3 v7, the new API via php:ModuleTemplate can be used instead. The DocumentTemplate class has been marked as deprecated.

Impact 

Instantiating the DocumentTemplate class will trigger a PHP E_USER_DEPRECATED error.

Affected Installations 

TYPO3 installations with third-party extensions adding backend modules using the DocumentTemplate API. These can typically be identified by extensions that "worked" but somehow looked ugly since TYPO3 v7 due to CSS and HTML changes.

Migration 

Use ModuleTemplate API instead, which can be built like this in a typical non-Extbase Backend controller (e.g. in an action such as "overviewAction"):

$moduleTemplate = GeneralUtility::makeInstance(ModuleTemplate::class);
$content = $this->getHtmlContentFromMyModule();
$moduleTemplate->setTitle('My module');
$moduleTemplate->setContent($content);
return $this->responseFactory->createResponse()
    ->withHeader('Content-Type', 'text/html; charset=utf-8')
    ->withBody($this->streamFactory->createStream($moduleTemplate->renderContent()));
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