[1] [CITE@en[Web Applications 1.0 r7502     Provide a way for authors to broadcast to many ports without memory leaks.]]
( ([TIME[2012-11-03 07:32:00 +09:00]] 版))
<http://html5.org/tools/web-apps-tracker?from=7501&to=7502>

[2] [CITE[''''''[''''''whatwg'''''']'''''' Define MessagePort.isConnected or MessagePort.ondisconnect]]
( ([TIME[2012-11-03 07:40:59 +09:00]] 版))
<http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2012-November/037774.html>

[3] [CITE@en[Web Applications 1.0 r7502  Provide a way for authors to broadcast to many ports without memory leaks.]]
( ([TIME[2012-11-03 07:32:00 +09:00]] 版))
<https://html5.org/r/7502>

[4] [CITE@en[Fix #194: remove PortCollection in favor of advice · whatwg/html@5804d8c]]
([TIME[2015-09-30 20:48:08 +09:00]] 版)
<https://github.com/whatwg/html/commit/5804d8c3d17fe8e9c9b486082a8ea498dce638e9>