This feature is not Baseline because it does not work in some of the most widely-used browsers.
The nackCount property of the RTCInboundRtpStreamStats dictionary indicates the number of times the receiver sent a NACK packet to the sender.
A NACK (Negative ACKnowledgement, also called "Generic NACK") packet tells the sender that one or more of the RTP packets it sent were lost in transport.
A positive integer.
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
nackCount |
80 | 80 | 55 | 67 | No | 80 | No | 57 | No | 13.0 | 80 | No |
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https://developer.mozilla.org/en-US/docs/Web/API/RTCInboundRtpStreamStats/nackCount