TYPO3 Core

The noopener link type prevents an opened URL from gaining access to the originating window.opener which is a general security enhancement for external links. A link would now look like <a href="..." rel="noopener">Link</a>.

• https://developer.mozilla.org/en/docs/Web/HTML/Link_types
• https://mathiasbynens.github.io/rel-noopener/

• implement for f:link.external view-helper (additional argument noopener, default is active)
• implement for external links in ContentObjectRenderer:typoLink or LinkService