If a document in a background tab calls window.alert() then the call to alert() will return immediately; the dialog will be shown to the user when they switch to the tab. A UI indicator will be set so the user is aware of the pending alert dialog. This removes the ability to use window.alert() to bring a tab to the front against the user’s will.

Status in Chromium


Removed (tracking bug) in:

  • Chrome for desktop release 64

Consensus & Standardization

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

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



This shipped in Safari 9.1 and Firefox 44.

Last updated on 2020-11-09