[1] XML Events 2 ( (2010-12-18 05:25:20 +09:00 版)) <http://www.w3.org/TR/xml-events2/#section-stopPropagation-element>

[2] Editorial: check stop propagation flag at start of invoke · whatwg/dom@a768d8e (2016-04-22 18:27:38 +09:00 版) <https://github.com/whatwg/dom/commit/a768d8eef0584ea8ee831895b5c9dc8bcf363afc>

[3] Add Event's cancelBubble attribute (annevk著, 2016-12-19 18:17:41 +09:00) <https://github.com/whatwg/dom/commit/e8a9f67886e554d81cf85277f61c6b1cd0ea6b44>