Important: #101128 - CKEditor's highlight plugin introduces mark HTML tag

See forge#101128

Description

The introduction of the CKEditor plugin @ckeditor/ckeditor5-language allows an editor to use the mark tag, as well as the s tag.

It may become necessary to explicitly allow this tag in the lib.parseFunc_RTE TypoScript setup to allow the tag to be rendered properly in the frontend:

lib.parseFunc_RTE {
  allowTags := addToList(mark,s)
}
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Custom CSS styling for different markers classes needs to be implemented in a sitepackage for example, as no frontend CSS for this is emitted by default.