text: module.exports.RTCSessionDescription = window.RTCSessionDescription ||
  	window.mozRTCSessionDescription;
  module.exports.RTCPeerConnection = window.RTCPeerConnection ||
  	window.mozRTCPeerConnection || window.webkitRTCPeerConnection;
  module.exports.RTCIceCandidate = window.RTCIceCandidate ||
  	window.mozRTCIceCandidate;
  