* 仕様書

[REFS[
- [38] [CITE@en[Beacon]] ([TIME[2016-10-28 09:21:03 +09:00]] 版) <https://w3c.github.io/beacon/>
]REFS]

* 関連

[24] 似た機能に [CODE(HTMLa)@en[[[ping]]]] があります。

* 実装

[39] [[Chrome]], [[Opera]], [[Firefox]], [[Edge]] が実装しています。

[40] [[Safari]], [[IE]] は実装していません。

;; [[Safari]] は [CODE[ping]] を実装しています。

* 歴史

[33] [CITE@en[936340 – Implement navigator.sendBeacon]]
( ([TIME[2013-12-24 15:04:21 +09:00]] 版))
<https://bugzilla.mozilla.org/show_bug.cgi?id=936340>

[34] [CITE[Issue 468527 - chromium - sendBeacon: Must honor CORS headers - An open-source project to help move the web forward. - Google Project Hosting]]
([TIME[2015-03-20 16:25:37 +09:00]] 版)
<https://code.google.com/p/chromium/issues/detail?id=468527>

[35] [CITE[IRC logs: freenode / #whatwg / 20150319]]
([TIME[2015-03-20 16:26:55 +09:00]] 版)
<http://krijnhoetmer.nl/irc-logs/whatwg/20150319#l-373>

[36] [CITE@en[Issue 490015 - chromium - Security: sendBeacon let's you send POST requests with arbitrary content type - Monorail]]
( ([TIME[2016-06-18 11:27:54 +09:00]]))
<https://bugs.chromium.org/p/chromium/issues/detail?id=490015>

[37] [CITE@en[drop Worker support]]
([[igrigorik]]著, [TIME[2016-10-26 05:44:46 +09:00]])
<https://github.com/w3c/beacon/commit/95e6a1f0efb7f374ab8fae20f30b79ce412deed4>



[1] [CITE@en[Beacon]]
( ([TIME[2013-05-07 00:00:42 +09:00]] 版))
<https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/Beacon/Overview.html>

[2] [CITE@en[Beacon]]
( ([TIME[2013-06-22 12:29:14 +09:00]] 版))
<https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/Beacon/Overview.html>

[3] [CITE@en[Beacon]]
( ([TIME[2013-10-26 06:14:43 +09:00]] 版))
<http://www.w3.org/TR/2013/WD-beacon-20131029/>

[4] [CITE@en[Beacon]]
( ([TIME[2014-06-24 04:50:40 +09:00]] 版))
<http://www.w3.org/TR/2014/WD-beacon-20140624/>

[5] [CITE@en[Beacon]]
( ([TIME[2014-06-24 04:49:28 +09:00]] 版))
<https://w3c.github.io/web-performance/specs/Beacon/Overview.html>

[6] [CITE@en[Beacon]]
([TIME[2015-09-19 03:16:13 +09:00]] 版)
<http://www.w3.org/TR/2015/WD-beacon-20150922/>

[7] [CITE@en[Beacon]]
([TIME[2015-09-25 06:15:55 +09:00]] 版)
<http://www.w3.org/TR/2015/WD-beacon-20150924/>

[8] [CITE@en[Beacon]]
([TIME[2015-09-29 22:31:13 +09:00]] 版)
<http://www.w3.org/TR/2015/WD-beacon-20150929/>

[9] [CITE@en[Beacon]]
([TIME[2015-10-22 02:33:06 +09:00]] 版)
<http://www.w3.org/TR/2015/WD-beacon-20151021/>

[10] [CITE@en[Beacon]]
([TIME[2015-10-27 11:36:34 +09:00]] 版)
<http://www.w3.org/TR/2015/WD-beacon-20151027/>

[11] [CITE@en[Beacon]]
([TIME[2015-10-30 15:21:42 +09:00]] 版)
<http://www.w3.org/TR/2015/WD-beacon-20151030/>

[12] [CITE@en[In what circumstances is "delayed execution" acceptable on the web?]]
([[Jake Archibald]] 著, [TIME[2015-11-11 19:11:53 +09:00]] 版)
<https://lists.w3.org/Archives/Public/public-webappsec/2015Nov/0009.html>

[13] [CITE@en[Beacon]]
([TIME[2015-11-26 02:11:56 +09:00]] 版)
<http://www.w3.org/TR/2015/WD-beacon-20151125/>

[14] [CITE@en[Beacon]]
([TIME[2015-12-01 04:37:18 +09:00]] 版)
<http://www.w3.org/TR/2015/WD-beacon-20151130/>

[15] [CITE@en[Beacon]]
([TIME[2015-12-10 04:21:33 +09:00]] 版)
<http://www.w3.org/TR/2015/WD-beacon-20151209/>


[16] [[Chrome]]、[[Firefox]]、[[Opera]] が実装しています。
[[Safari]] と [[Edge]] は未実装です。
[TIME[2016-01-05T04:28:31.600Z]]


[17] [CITE@en[Merge pull request #23 from w3c/cleanup · w3c/beacon@fd52175]]
([TIME[2016-01-21 12:16:11 +09:00]] 版)
<https://github.com/w3c/beacon/commit/fd5217527ec11c0253ba450a744ac61fde8a464c>

[18] [CITE@en[Beacon]]
([TIME[2016-01-22 02:04:16 +09:00]] 版)
<https://www.w3.org/TR/2016/WD-beacon-20160121/>

[19] [CITE@en[Beacon]]
([TIME[2016-02-02 10:45:02 +09:00]] 版)
<https://www.w3.org/TR/2016/WD-beacon-20160202/>

[20] [CITE@en[Beacon]]
([TIME[2016-02-03 18:37:52 +09:00]] 版)
<https://www.w3.org/TR/2016/WD-beacon-20160203/>

[21] [CITE@en[Beacon]]
([TIME[2016-02-05 06:15:14 +09:00]] 版)
<https://www.w3.org/TR/2016/WD-beacon-20160204/>

[22] [CITE@en[Beacon]]
([TIME[2016-02-09 18:58:19 +09:00]] 版)
<https://www.w3.org/TR/2016/WD-beacon-20160209/>

[23] [CITE@en[Beacon]]
([TIME[2016-02-18 07:56:04 +09:00]] 版)
<https://www.w3.org/TR/2016/WD-beacon-20160217/>

[25] [CITE@en[Beacon]]
([TIME[2016-02-26 04:50:24 +09:00]] 版)
<https://www.w3.org/TR/2016/WD-beacon-20160225/>

[26] [CITE@en[set cors mode based on payload's object type]]
([[igrigorik]]著, [TIME[2016-06-30 00:11:18 +09:00]])
<https://github.com/w3c/beacon/commit/c28c6c26c624adc1ba87c4c14ddefd6a3a830ef9>

[27] [CITE@en[Merge pull request #33 from w3c/nocors]]
([[toddreifsteck]]著, [TIME[2016-06-30 08:57:52 +09:00]])
<https://github.com/w3c/beacon/commit/62f466477436042108f8d2cb92bc1c6cae1644ed>

[28] [CITE@en[Beacon]]
([TIME[2016-06-30 08:59:05 +09:00]])
<https://www.w3.org/TR/2016/WD-beacon-20160629/>

[29] [CITE@en[Merge pull request #34 from w3c/cors-whitelist]]
([[plehegar]]著, [TIME[2016-08-18 04:31:50 +09:00]])
<https://github.com/w3c/beacon/commit/b917e89fbe0e448e3318428b33d7fb9a66820cea>

[30] [CITE@en[Beacon]]
([TIME[2016-08-30 23:14:18 +09:00]])
<https://www.w3.org/TR/2016/WD-beacon-20160830/>

[31] [CITE@en[Beacon]]
([TIME[2016-10-26 05:58:25 +09:00]])
<https://www.w3.org/TR/2016/WD-beacon-20161025/>

[32] [CITE@en[Beacon]]
([TIME[2016-10-28 09:22:02 +09:00]])
<https://www.w3.org/TR/2016/WD-beacon-20161028/>

[41] [CITE@en[Call for Exclusions: Beacon]]
([[Xueyuan Jia]]著, [TIME[2017-04-13 19:45:47 +09:00]])
<https://lists.w3.org/Archives/Public/public-web-perf/2017Apr/0012.html>

[42] [CITE@en[Beacon]]
([TIME[2017-04-13 15:48:02 +09:00]])
<https://www.w3.org/TR/2017/CR-beacon-20170413/>

[43] [CITE@en[Align with w3c/hr-time#47]]
([[plehegar]]著, [TIME[2017-05-05 03:43:54 +09:00]])
<https://github.com/w3c/beacon/commit/b68ea67c006066d09a7a77c78afb5981037ebb87>

[44] [CITE@en[clarify size enforcement & relationship with Fetch]]
([[igrigorik]]著, [TIME[2017-05-20 08:52:25 +09:00]])
<https://github.com/w3c/beacon/commit/96840eaf2f3ec5eaf32e2c53def1957b4656f1fa>

[45] [CITE@en[Deprecations and Removals in Chrome 60  |  Web  |  Google Developers]]
([TIME[2017-06-15 00:01:43 +09:00]])
<https://developers.google.com/web/updates/2017/06/chrome-60-deprecations>

[46] [CITE[Release Notes for Safari Technology Preview 38 | WebKit]]
([TIME[2017-08-24 12:11:35 +09:00]])
<https://webkit.org/blog/7877/release-notes-for-safari-technology-preview-38/>

[47] [CITE@en[cleanup processing section (#54)]]
([[igrigorik]]著, [TIME[2017-09-11 22:58:33 +09:00]])
<https://github.com/w3c/beacon/commit/d46efe0034e80bd20188ccbda6de24ab7e5e70f5>

[48] [CITE[New WebKit Features in Safari 11.1 | WebKit]]
([TIME[2018-04-13 13:40:37 +09:00]])
<https://webkit.org/blog/8216/new-webkit-features-in-safari-11-1/>

[49] [CITE[New WebKit Features in Safari 11.1 | WebKit]]
([TIME[2018-04-24 13:06:21 +09:00]])
<https://webkit.org/blog/8216/new-webkit-features-in-safari-11-1/>