Effective connection type - MDN Web Docs Glossary: Definitions of Web-related terms 编辑

Effective connection type (ECT) refers to the measured network performance, returning a cellular connection type, like 3G, even if the actual connection is tethered broadband or WiFi, based on the time between the browser requesting a page and effective type of the connection.

The values of 'slow-2g', '2g', '3g', and '4g' are determined using observed round-trip times and downlink values.

effectiveType is a property of the Network Information API, exposed to JavaScript via the navigator.connection object. To see your effective connection type, open the console of the developer tools of a supporting browser and enter the following:

navigator.connection.effectiveType;

See also

• Network Information API
• NetworkInformation
• NetworkInformation.effectiveType