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okay, the article is updated

Thanks! I personally would also add a note to the website. The official implementation example even includes an opt-in dialogue. Look here: https://markus-kottlaender.de

okay, is that feature provided by coinhive ?

yes, here: https://coinhive.com/documentation/miner
you don't have to use this... of course this will drop the number of miners dramatically ;)
but I just prefer this transparent approach instead of just silently using the visitors cpu power.