[1] [CITE[Bug 11731 – Replace <hgroup> element with a <subhead> element used as the child of the <hx> element]]
( ([TIME[2011-03-03 08:06:48 +09:00]] 版))
<http://www.w3.org/Bugs/Public/show_bug.cgi?id=11731>

[2] [CITE@en[Web Applications 1.0 r6052 remove <hgroup> from the w3c spec by request of steven faulkner]]
( ([TIME[2011-05-04 04:37:00 +09:00]] 版))
<http://html5.org/tools/web-apps-tracker?from=6051&to=6052>

[3] [CITE@en[Web Applications 1.0 r6064 revert change per http://lists.w3.org/Archives/Public/public-html/2011May/0061.html]]
( ([TIME[2011-05-05 05:21:00 +09:00]] 版))
<http://html5.org/tools/web-apps-tracker?from=6063&to=6064>

[4] [CITE[IRC logs: freenode / #whatwg / 20110504]]
( ([TIME[2011-05-07 12:34:23 +09:00]] 版))
<http://krijnhoetmer.nl/irc-logs/whatwg/20110504>