[1] Remove CanvasProxy along with related concepts and complexities · whatwg/html@740634d (2016-03-08 18:43:16 +09:00 版) https://github.com/whatwg/html/commit/740634d0f30a3b76e9da166ac2fa8835fcc073ab

[2] CanvasTransform is far from historical (annevk著, 2018-01-29 23:12:18 +09:00) https://github.com/whatwg/html/commit/49e6558af9b2df0a6804df21ef23af31982eedea

[3] CanvasTransform is far from historical by annevk · Pull Request #3425 · whatwg/html (2018-02-06 13:31:57 +09:00) https://github.com/whatwg/html/pull/3425