[2] Mactopia Japan : Internet Explorer 5 for Mac (OS 8.1〜9.x </span>用<span>) </span>の新機能 <http://www.microsoft.com/japan/mac/products/ie/5/feature.asp?feature=1>
[3] IRC logs: freenode / #whatwg / 20111226 ( (2011-12-27 08:38:44 +09:00 版)) <http://krijnhoetmer.nl/irc-logs/whatwg/20111226#l-240>