I am working on upgrading my instances to 24.2, and checking all the applications prior to pulling the trigger. One of the things I was using was browser based spellcheck, by specifying
options.editorOptions.browser_spellcheck = true
in the TinyMCE initialization function. I've been searching for a while now, and can't seem to find any documentation on ORTL or support for browser based spellcheck in CKEditor5. The only mention of spellcheck leads you to a paid plugin!