Deprecation: #65934 - "Prefix Local Anchors" functionality moved to legacy extension

See forge#65934

Description

Prefixing local anchors is not considered best practice in web sites anymore as the same is achieved with absolute prefixes for links (see config.absRefPrefix). Therefore the according functionality has been moved to the legacy extension EXT:compatibility6.

The following TypoScript option has been marked for deprecation:

config.prefixLocalAnchors
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The following PHP methods have been marked for deprecation:

TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController::prefixLocalAnchorsWithScript()
TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController::doLocalAnchorFix()
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Impact

The content output of the TYPO3 frontend is not prefixed with local anchors anymore unless EXT:compatibility6 is loaded.

Affected installations

Any installation having the TypoScript option config.prefixLocalAnchors set will have different behaviour in the frontend rendering.

Migration

For TYPO3 CMS 7, installing EXT:compatibility6 brings back the existing functionality.