RTCStatsReport - Web APIs
certificate an rtccertificatestats object providing statistics related to a certificate being used by an rtcicetransport.

RTCStatsType - Web APIs
certificate an rtccertificatestats object providing statistics related to a certificate being used by an rtcicetransport.

WebRTC Statistics API - Web APIs
rtccertificatestats rtcstats codec statistics about a specific codec being used by streams being sent or received by this connection.