Hi,
I also created a similar serverless WebRTC test site for my learning curve and others.

http://webrtcdevelop.appspot.com/

My code works with Chrome with "reliable" DataChannel flag true.
I think the reason your code does not work with Chrome is
Line157
pc1.onconnection = handleOnconnection;

which never fired on Chrome

(cf.)
chrome RTCPeerConnection event not fire after connected
http://stackoverflow.com/questions/17784780/chrome-rtcpeerconnection-event-not-fire-after-connected

onconnection is not part of the interface in the latest standard, so that's probably why it's not implemented in Chrome: http://dev.w3.org/2011/webrtc/editor/webrtc.html#interface-definition.

The code in Firefox lists onconnection as a Mozilla extension: https://github.com/mozilla/mozilla-central/blob/master/dom/webidl/RTCPeerConnection.webidl#L98.

Having said that, I stack where DataChannel send never works with Firefox. Chrome works fine on the other hand.
I observe your code also fails with DataChannel send with Firefox.

Please investigate my code(only 150lines), and do you have any idea on these?
Thanks.

Doesn't work on Chrome #1

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