[1] [CITE@en[(X)HTML5 Tracking]]
([TIME[2010-01-30 21:19:42 +09:00]] 版)
[2] [CITE[IRC logs: freenode / #whatwg / 20100130]]
([TIME[2010-01-31 21:32:20 +09:00]] 版)
[3] [CITE@en[HTML5 Revision Tracker]]
([TIME[2010-04-15 23:16:27 +09:00]] 版)
[4] [CITE@en[Web Applications 1.0 r5517 should only be used as a caption of a no-alt if there's no other content in the