Hello, in my opinion, an information (W3C) is first of all a hint, consequently not necessarily a "(gross) error".
I have found this explanation among others:
https://stackoverflow.com/questions/355 ... d-in-html5
Will be resolved in 3.3.9Mannix_ wrote: Sun Oct 16, 2022 10:20 am those links are added by the extensions. So I would look in there. To be precise in the ext/extName/styles/styleNameThatYouUse/template/event