[1] Drop SVGZoomEvent. · w3c/svgwg@3844475 (2016-02-06 12:30:31 +09:00 版) https://github.com/w3c/svgwg/commit/3844475c05b865e961a0bc52cd63e627412360e2

[2] Drop support for SVGZoomEvent in createEvent() (foolip著, 2016-11-10 16:36:39 +09:00) https://github.com/whatwg/dom/commit/80b1640147650de7773062aedfc5672bc8c6fb8f

[3] document.createEvent() supports lots of events that most UAs do not support initializers for · Issue #362 · whatwg/dom (2017-08-08 21:46:27 +09:00) https://github.com/whatwg/dom/issues/362