[1] (X)HTML5 Tracking (10/14/2009, 10:53:47 PM 版) <http://html5.org/tools/web-apps-tracker?from=4141&to=4142>

[2] Add the onloadend content and IDL event handler attribute (domenic著, 7/14/2016, 8:43:53 PM) <https://github.com/whatwg/html/commit/79ae99fe5bc2026301cb5b539588e29aac67a0e1>