Chromium

• Changed: API for customizing HTMLMediaElement.seekable for Media Source live streams

  Status	Behind a flag	→	Enabled by default
  Flag	True	→	False
  Android	53	→	62
  Desktop	53	→	62

• Changed: RegExp lookbehind assertions

  Status	No active development	→	Enabled by default
  Android	(n/a)	→	62
  Desktop	(n/a)	→	62

• Changed: Object rest/spread properties

  Ios	60	→	(n/a)