%% You should probably cite draft-ietf-rtcweb-constraints-registry instead of this I-D.
@techreport{burnett-rtcweb-constraints-registry-04,
    number =    {draft-burnett-rtcweb-constraints-registry-04},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-burnett-rtcweb-constraints-registry/04/},
    author =    {Daniel C. Burnett},
    title =     {{IANA Registry for RTCWeb Constrainable Properties}},
    pagetotal = 5,
    year =      2013,
    month =     oct,
    day =       20,
    abstract =  {Specifications in W3C's Media Capture Task Force and WebRTC Working Group have need of a registry in which to maintain a list of constrainable properties for HTML media and other constrainable objects. This document defines this registry.},
}