Hello,This is very likely coming from some app. It's called data attribute and data attributes per se are harmless, it won't slow down your website or anything, so I wouldn't worry about it.Kind regards,Diego
Thank you for your reply.
Is there a way we can know for sure where it is coming from?
Is it normal that the html is duplicated rather than having only the data attributes? And can you tell if the data attributes are harmless in my case according to the screenshots?