For dedicated workers, if an error is not handled then it will be propagated up to the parent context and the error reporting process begins again one layer up (e.g., to the window's onerror handler). This allows for errors to be propagated up to the original document giving developers the freedom to choose when and how to handle worker errors.


Established standard

Status in Chromium


Enabled by default (tracking bug) in:

  • Chrome for desktop release 72
  • Chrome for Android release 72
  • Android WebView release 72

Consensus & Standardization

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

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


Search tags

workers, onerror,

Last updated on 2020-11-09