For a very long time, the first two arguments (type and listener) of addEventListener and removeEventListener have been optional, where they are non-optional in the spec and other browsers. This will change, so that calling these methods with zero or one argument will start to throw exceptions.




Established standard

Status in Chromium


Enabled by default (tracking bug) in:

  • Chrome for desktop release 49
  • Chrome for Android release 49
  • Android WebView release 49

Consensus & Standardization

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

  • Shipped/Shipping
  • Shipped/Shipping
  • No signal
  • No signals


Last updated on 2020-11-09