TYPO3 Core

The link browser does not support the assignment of multiple classes any more. Previously, this was possible with a CKEditor configuration as shown below:

classes:
    link link--external:
        name: "Link (external)" 
    link link--email:
        name: "Link (email)" 

buttons:
    link:
        properties:
            class:
                allowedClasses: "link link--external, link link--email"