[1] The subhead element - HTML extension specification ( (2013-06-16 10:37:11 +09:00 版)) <http://rawgithub.com/w3c/subline/master/index.html>
[2] Re: <subline> becomes <subhead> and other updates ( (Steve Faulkner 著, 2013-06-09 01:48:49 +09:00 版)) <http://lists.w3.org/Archives/Public/public-html/2013Jun/0025.html>