Nice docs by @fugueish on service worker security considerations: https://sites.google.com/a/chromium.org/dev/Home/chromium-security/security-faq/service-worker-security-faq …
There is no periodic sync implemented anywhere, in any browser. Does not exist.
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...which folks who play with the API or look the source code can know easily. E.g.: https://cs.chromium.org/chromium/src/third_party/WebKit/Source/modules/background_sync/SyncManager.idl?dr=C …
Thanks. Twitter will use this to make your timeline better. UndoUndo
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& Web Standards TL; Blink API OWNER
Named PWAs w/
DMs open. Tweets my own; press@google.com for official comms.