[2] At @annevk's request, add & export definitions for 'opaque black' and… (@annevk著, ) https://github.com/w3c/csswg-drafts/commit/6421e5734c9564fe50b93a92504af08017758521
[3] Clarify the definition of addColorStop() (Ms2ger著, ) https://github.com/whatwg/html/commit/cc508ebd8427dd561ed2dc3d5d9a45a967fccf71