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Web Platform Baseline Status Breakdown Total Features: 1219
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Limited Availability

2 features
• In Progress / Not Yet Baseline

The service worker install event's addRoutes method declares resource paths that should either be fetched from the network or the cache, to bypass the service worker and improve performance.

Chrome 123
Firefox —
Safari 27
Edge 123
Status: Incomplete cross-engine support

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.

Chrome 148
Firefox —
Safari —
Edge 148
Status: Incomplete cross-engine support