[1] (X)HTML5 Tracking (2009-10-15 07:53:47 +09:00 版) <http://html5.org/tools/web-apps-tracker?from=4141&to=4142>

[2] Add the onloadend content and IDL event handler attribute (domenic著, 2016-07-15 05:43:53 +09:00) <https://github.com/whatwg/html/commit/79ae99fe5bc2026301cb5b539588e29aac67a0e1>