[1] Remove more types from document.createEvent() (ayg著, ) <https://github.com/whatwg/dom/commit/5a532da58455e55b1e611161b72224d083fee7d4>
[2] "create an event" doesn't work for certain UI events · Issue #414 · whatwg/dom () <https://github.com/whatwg/dom/issues/414>
[3] Define event constructing steps by annevk · Pull Request #614 · whatwg/dom () <https://github.com/whatwg/dom/pull/614>