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Last I checked Chrome's DataChannels implementation was flakey and missing support for several attributes

This should no longer be true. Chrome v31 (http://googlechromereleases.blogspot.com/2013/11/stable-chan...) added SCTP support for reliable DataChannels and allowing compatibility with Firefox.

Chrome and Firefox DataChannels cannot connect with each other. Chrome and Firefox media connections can interop though

there are a few workarounds you have to use. there is a compatibility shim floating around somewhere (i think from mozilla).