Remember to also check for data in localStorage, IndexedDB and so on. Service Workers can upload saved data after you closed the tab: https://developer.mozilla.

Remember to also check for data in localStorage, IndexedDB and so on. Service Workers can upload saved data after you closed the tab: https://developer.mozilla.org/en-US/docs/Web/API/Background_Synchronization_API https://developer.mozilla.org/en-US/docs/Web/API/Background_... Not that I doubt OP in any way, just in case you really want to be sure :)