The navigator.languages property exposes the Accept Language header and the languageevent, which is fired on the Window object to notifiy scripts of changes to this value. Both features allow web applications to handle i18n in the client and react to user language changes. This change makes these features available to workers. Specifically, navigator.languages is available on workers and languageevent is fired on workers as well as the main thread.



Specification link

Specification being incubated in a Community Group

Status in Chromium


Enabled by default (tracking bug)

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 signals



Navigator.languages on the main thread:

Search tags

workers, languages, navigator,

Last updated on 2021-12-13