Breaking: #45512 - No type attributes for style and link tags

See Issue #45512

Description

It is recommended for <style> and <link> HTML tags to not use the “type” attribute anymore.

These references state its recommended practice to omit them:

• https://developer.mozilla.org/en-US/docs/Web/HTML/Element/link
• https://developer.mozilla.org/en-US/docs/Web/HTML/Element/style

For this reason, TYPO3 does not add this “type” attribute to the mentioned HTML elements anymore when rendering HTML.

Impact

The attribute type is removed from the HTML tags <style> and <link> by default for TYPO3 Backend and Frontend output.

Affected Installations

All installations of TYPO3 that use <style> or <link> tags are affected. The probability this has negative impact on the user experience is low, however.

Migration

If requested due to very old browser requirements for TYPO3 Frontend, the type attribute can be added via TypoScript options or Fluid AssetCollector attributes again.