Chromium

• Changed: Customized built-in elements

  Status	In development	→	Behind a flag
  Flag	False	→	True
  Android	(n/a)	→	66
  Desktop	(n/a)	→	66

• Changed: Service worker: Disallow CORS responses for same-origin requests.

  Status	In development	→	Enabled by default
  Desktop	(n/a)	→	66

• Added: Service worker: Non-nullable FetchEvent#clientId

  Status	Enabled by default