getCapabilities method
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Obtain the sender capabilities, based on kind. If kind is omitted or is set to " ", then all capabilities are returned. Microsoft Edge does not support codecs such as retransmission [RFC4588], redundancy [RFC2198] or Forward Error Correction which do not have an associated value of kind (and therefore would always be returned).
Syntax
var retval = RTCRtpSender.getCapabilities(kind);
Parameters
kind [optional]
Type: DOMString(nullable)