[3] [CITE@en-US[Object.is - JavaScript | MDN]]
( ([TIME[2013-03-30 14:57:36 +09:00]] 版))
<https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Object/is>

[4] [CITE[IRC logs: freenode / #whatwg / 20140519]]
( ([TIME[2014-05-22 17:23:00 +09:00]] 版))
<http://krijnhoetmer.nl/irc-logs/whatwg/20140519>

[5] [CITE[IRC logs: freenode / #whatwg / 20150115]]
( ([TIME[2015-01-16 11:42:14 +09:00]] 版))
<http://krijnhoetmer.nl/irc-logs/whatwg/20150115>