[1] [CITE[IRC logs: freenode / #whatwg / 20090817]]
([TIME[2009-10-11 15:59:52 +09:00]] 版)
<http://krijnhoetmer.nl/irc-logs/whatwg/20090817#l-1015>

[2] [CITE@en[Web Applications 1.0 r5735 Remove UndoManager from W3C HTML5 spec since it's not really fully baked yet.]]
( ([TIME[2011-01-01 15:20:00 +09:00]] 版))
<http://html5.org/tools/web-apps-tracker?from=5734&to=5735>

[3] [CITE[Undo Manager and DOM Transaction]]
( ([TIME[2011-07-27 15:57:21 +09:00]] 版))
<https://rniwa.com/editing/undomanager.html>

[4] [CITE[''''''[''''''whatwg'''''']'''''' Fixing undo on the Web - UndoManager and Transaction]]
( ([TIME[2011-08-26 08:28:26 +09:00]] 版))
<http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2011-August/032987.html>

[5] [CITE@en[Web Applications 1.0 r6527 Remove UndoManager in favour of http://rniwa.com/editing/undomanager.html (and a minor editorial tweak to an example)]]
( ([TIME[2011-08-26 08:13:00 +09:00]] 版))
<http://html5.org/tools/web-apps-tracker?from=6526&to=6527>