Limited Availability Workers

Shared worker extended lifetime

The extendedLifetime option of the SharedWorker() constructor gives shared workers extra time to perform operations after all pages using it have been navigated away from or closed.

Baseline Status: This feature is currently Limited (not yet Baseline). Latest engine implementation shipped on May 7, 2026.

Desktop Browser Engine Support

Google Chrome

148

Supported

Mozilla Firefox

—

Unsupported

Apple Safari

—

Unsupported

Microsoft Edge

148

Supported

Mobile Browser Engine Support

Chrome Android

148

Firefox Android

—

Safari iOS

—

Specifications and References

Specification ↗ Feature XML ↗

MDN Browser Compat Data Keys:

api.SharedWorker.SharedWorker.options_extendedLifetime_parameter ↗