• The measured network performance, returning a cellular connection type, like 3G, even if the actual connection is tethered broadband or Wi-Fi, based on the time between the browser requesting a page and effective type of the connection. ECT’s values of slow-2g, 2g, 3g, and 4g are determined using observed round-trip times and downlink values. ← MDN Web Docs ↑ wicg.github.io/netinfo

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