Offline.js is a library to automatically alert your users when they've lost internet connectivity, like Gmail.
https://github.hubspot.com/offline/docs/welcome/
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Get access to data on 10,070 websites Offline JS Customers. We know of 2,661 live websites using Offline JS and an additional 7,409 sites that used Offline JS historically and 984 websites in the United States.
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Get a list of 10,070 websites using Offline JS which includes location information, hosting data, contact details, 2,661 currently live websites and an additional 11,402 domains that redirect to sites in this list. 7,409 sites that used this technology previouslyand 984 websites in the United States currently using Offline JS.
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