What is my connection?
Some browsers expose a Network Information Application Programming Interface with an estimated connection type, round-trip time, and downlink. This is a hint from your browser, not a lab-grade speed test.
Connection type
FAQ
Some browsers report an estimated connection type (for example 4G or Wi‑Fi-like “effectiveType”) plus hints like downlink and round-trip time via the Network Information Application Programming Interface. It is a browser estimate, not a full speed test.
Safari and Firefox often omit navigator.connection. Chrome-family browsers are more likely to report effectiveType, downlink, and rtt.
- There is usually no user toggle for navigator.connection.
- Chromium:appears when the Network Information Application Programming Interface is available.
- Firefox / Safari:typically shows “not reported.”
- Extensions or enterprise policies can block the Application Programming Interface.
- Data-saver / Lite mode can change the reported type.
Downlink is an estimated bandwidth hint in megabits per second. round-trip time is an estimated latency in milliseconds. Both are browser hints, not lab measurements.
Use a Chromium-based browser if you want this Application Programming Interface. Close bandwidth-limited modes, and test on the network you care about (Wi‑Fi vs cellular). Reload the page after switching networks.