Symbol.hasInstance enables customizing the behavior of the 'instanceof' operator.


Established standard

Status in Chromium


In developer trial (Behind a flag) (tracking bug) in:

  • Chrome for desktop release 50

Consensus & Standardization

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

  • No signal
  • No signal
  • In development
  • No signals


Last updated on 2020-11-09