Blink now follows the DOM and HTML specs and declares HTMLAllCollection, HTMLCollection, HTMLFormControlsCollection and HTMLOptionsCollection with the [LegacyUnenumerableNamedProperties] extended attribute. Its named properties are no longer marked as enumerable, being left out of calls to e.g. Object.keys() and for-in loops.


Editor's draft

Status in Chromium


Enabled by default (tracking bug) in:

  • Chrome for desktop release 63
  • Chrome for Android release 63

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.


Last updated on 2020-11-09