org.scalajs.dom.experimental.webrtc
see https://www.w3.org/TR/2015/WD-webrtc-20150210/#idl-def-RTCDataChannelState in W3C spec
see https://www.w3.org/TR/2015/WD-webrtc-20150210/#idl-def-RTCDataChannelState in W3C spec