[2] Make set replacement more limited in scope (annevk著, 2017-04-26 17:02:30 +09:00) <https://github.com/whatwg/infra/commit/68c289660635448d9eba7238368ad310c4fbd98b>

[3] Always update a DOMTokenList (annevk著, 2017-04-19 22:00:17 +09:00) <https://github.com/whatwg/dom/commit/d396872f847d63b803393092eb81843e80d566b7>

[4] Use Infra's concatenation definition (annevk著, 2018-01-05 03:23:42 +09:00) <https://github.com/whatwg/dom/commit/53511b8edddd7943c5769a2dc1703cac66a1c95f>