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That link describes a web page that keeps running and sending data even after your browser is closed. Why shouldn't I be scared by that? Isn't that the holy gra

• TheCoelacanth 9y ago
  It seems like there are some restrictions on them, but they are kind of vague about exactly how restrictive they are. > Sync events will often complete while the user has a page open to the site, so requiring user permission would be a poor experience. Instead, we’re limiting when syncs can be registered and triggered to prevent abuse. E.g.: > You can only register for a sync event when the user has a window open to the site. > The event execution time is capped, so you can’t use them to ping a server every x seconds, mine bitcoins or whatever.