[1]
[CITE[Cross-document messaging in Opera - Arve Bersvendsen]] <http://virtuelvis.com/archives/2005/12/cross-document-messaging>

[2]
[[Web Applications 1.0]] の、他の[[ドメイン]]の[[文書]]に[[メッセージ]]を送る機能。

[[Opera 8]] β にはありませんでしたが、 [[Opera 8.5]]
では実装されていました。

[3]
[CITE[The cross-document messaging APIs]] ([[Ian Hickson <ian@...>]] 著, [CODE[2007-08-09 00:51:36 +09:00]] 版) <http://permalink.gmane.org/gmane.org.w3c.whatwg.discuss/11634>

[4]
[CITE[Index of /specs/dom/messages]] ([CODE[2008-02-13 01:58:34 +09:00]] 版) <http://www.hixie.ch/specs/dom/messages/>

[23]
[CITE[Fixed a security problem with postMessage()]] ([[Ian Hickson <ian@...>]] 著, [CODE[2008-02-12 20:03:46 +09:00]] 版) <http://permalink.gmane.org/gmane.org.w3c.whatwg.discuss/13237>
([[名無しさん]])

[24]
[CITE[IE Team Feedback on HTML 5.0 Cross Document Messaging]] ([[Sunava Dutta <sunavad@...>]] 著, [CODE[2008-02-22 03:18:40 +09:00]] 版) <http://permalink.gmane.org/gmane.org.w3c.whatwg.discuss/13320>

[32]
[CITE[postMessage() issues]] ([[Ian Hickson <ian@...>]] 著, [CODE[2008-04-16 00:10:07 +09:00]] 版) <http://permalink.gmane.org/gmane.org.w3c.whatwg.discuss/13716>

[38]
[CITE[postMessage feedback]] ([[Ian Hickson <ian@...>]] 著, [CODE[2008-04-24 23:49:56 +09:00]] 版) <http://permalink.gmane.org/gmane.org.w3c.whatwg.discuss/13867>

[39] [CITE@en[(X)HTML5 Tracking]]
([TIME[2010-01-09 14:12:17 +09:00]] 版)
<http://html5.org/tools/web-apps-tracker?from=4547&to=4548>

[40] [CITE@en-US-x-Hixie[HTML5 Communications]]
([TIME[2010-01-09 10:10:53 +09:00]] 版)
<http://dev.w3.org/html5/postmsg/Overview.html>

[41] [CITE[IRC logs: freenode / #whatwg / 20100212]]
([TIME[2010-02-14 11:17:32 +09:00]] 版)
<http://krijnhoetmer.nl/irc-logs/whatwg/20100212#l-271>

[42] [CITE@en-US[David Baron's weblog: setTimeout with a shorter delay]]
([TIME[2010-03-16 08:44:54 +09:00]] 版)
<http://dbaron.org/log/20100309-faster-timeouts>

[43] [CITE['''['''whatwg''']''' postMessage's target origin argument can be a full URL in some implementations]]
([TIME[2010-08-11 10:18:42 +09:00]] 版)
<http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2010-August/027848.html>

[44] [CITE@en[HTML5 Revision Tracker]]
([TIME[2010-08-11 23:17:32 +09:00]] 版)
<http://html5.org/tools/web-apps-tracker?from=5276&to=5277>

[45] [CITE[''''''[''''''whatwg'''''']'''''' postMessage's target origin argument can be a full URL in some implementations]]
( ([TIME[2010-11-16 08:52:44 +09:00]] 版))
<http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2010-November/029037.html>

[46] [CITE@en[Web Applications 1.0 r5682      Revert r5277's removal of '/' as a magic value to postMessage(), since it has useful use cases. Paths in absolute URLs are still ignored without raising an exception.]]
( ([TIME[2010-11-16 08:25:00 +09:00]] 版))
<http://html5.org/tools/web-apps-tracker?from=5681&to=5682>

[47] [CITE@en-US-x-Hixie[HTML5 Web Messaging]]
( ([TIME[2010-11-19 05:40:25 +09:00]] 版))
<http://www.w3.org/TR/2010/WD-webmessaging-20101118/>

[48] [CITE[IE で postMessage 的実装をちゃんとやる - 冬通りに消え行く制服ガールは、夢物語にリアルを求めない。 - subtech]]
( ([TIME[2010-12-07 22:02:13 +09:00]] 版))
<http://subtech.g.hatena.ne.jp/cho45/20101207/1291719344>

[49] [CITE@en-US-x-Hixie[HTML5 Web Messaging]]
( ([TIME[2011-03-17 23:58:26 +09:00]] 版))
<http://www.w3.org/TR/2011/WD-webmessaging-20110317/>