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* 仕様書

[REFS[
- [7] [CITE@en[DOM Standard]] ([TIME[2016-07-22 16:39:35 +09:00]]) <https://dom.spec.whatwg.org/#event-relatedtarget>
]REFS]

* 意味

[8] [[イベントオブジェクト]]は、[DFN[[F[[RUBYB[[[関連対象]]]@en[related target]]]]]]を持ちます。
既定値は [CODE[null]] です。 [SRC[>>7]]

[9] [F[関連対象]]は、[F[イベント経路]]の各要素の構成要素でもあります。
[[dispatch]] で[[イベントオブジェクト]]の[F[関連対象]]の設定に使われます。

* 歴史

[1] [CITE@en[Web Applications 1.0 r7791     Add a .relatedTarget attribute on 'show' events for <menu> elements.]]
( ([TIME[2013-04-04 05:23:00 +09:00]] 版))
<http://html5.org/tools/web-apps-tracker?from=7790&to=7791>

[2] [CITE@en[Web Applications 1.0 r7792     Set the .relatedTarget attribute on 'click' events for <menuitem> elements (and their master commands) properly.]]
( ([TIME[2013-04-04 07:31:00 +09:00]] 版))
<http://html5.org/tools/web-apps-tracker?from=7791&to=7792>

[3] [CITE@en[Web Applications 1.0 r8396     Make some dragleave and dragenter events have a relatedTarget.]]
( ([TIME[2014-01-14 09:43:00 +09:00]] 版))
<http://html5.org/tools/web-apps-tracker?from=8395&to=8396>

[4] [CITE[IRC logs: freenode / #whatwg / 20140508]]
( ([TIME[2014-05-12 14:41:45 +09:00]] 版))
<http://krijnhoetmer.nl/irc-logs/whatwg/20140508>

[5] [CITE@en[Fix #486: Fix 'get the parent' for relatedTarget]]
( ([[hayatoito]]著, [TIME[2016-06-01 14:53:00 +09:00]]))
<https://github.com/w3c/webcomponents/commit/b1433e5f3a013ca825f02fb8f7b0e9d6217c0125>

[6] [CITE@en[Shadow: define event's relatedTarget handling]]
([[hayatoito]]著, [TIME[2016-07-22 16:39:19 +09:00]])
<https://github.com/whatwg/dom/commit/ef69a247681532e6102ced9a78aabf7f7a536108>

[10] [CITE@en[Clarify the relatedTarget definition for pointerevents (#190)]]
([[NavidZ]]著, [TIME[2017-03-23 04:14:31 +09:00]])
<https://github.com/w3c/pointerevents/commit/beb2b009087f547393267355648506af12f5aa1c>

[11] [CITE@en[Clear event's target and relatedTarget when dispatch ends at a shadow…]]
([[TakayoshiKochi]]著, [TIME[2017-10-05 17:18:37 +09:00]])
<https://github.com/whatwg/dom/commit/9ada239e14fe7964577276ef9d8972069e665247>

[12] [CITE@en[Event.target should return null after dispatch is complete, when stopped at ShadowRoot · Issue #511 · whatwg/dom]]
([TIME[2017-10-10 22:27:28 +09:00]])
<https://github.com/whatwg/dom/issues/511>

[13] [CITE@en[Set event.target to null when dispatching finishes at ShadowRoot by TakayoshiKochi · Pull Request #513 · whatwg/dom]]
([TIME[2017-10-10 22:30:49 +09:00]])
<https://github.com/whatwg/dom/pull/513>

[14] [CITE@en["create an event" doesn't work for certain UI events · Issue #414 · whatwg/dom]]
([TIME[2018-04-07 16:06:17 +09:00]])
<https://github.com/whatwg/dom/issues/414>

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