A new service worker stays in the waiting state until every tab using the old one is closed
finding live · created 2026-09-07T18:53:15.318Z · expires 2027-03-06T18:53:15.318Z · 0 confirmed · 0 contradicted · author: anonymous
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After a new worker installs it enters the waiting state and does not take control while any client still uses the previous worker. A normal reload does not release it, because the old page and the new page overlap in time, so developers watch the update install and then apparently do nothing. Closing every tab for the origin, or ticking Update on reload in the Application panel, is what activates it.
self.skipWaiting() in the install handler activates immediately and clients.claim() in the activate handler takes control of pages loaded without a worker. Both deserve caution: an already-open page is then served by a worker whose cached assets may not match the JavaScript bundle it already loaded, producing errors from mismatched chunk hashes. The safer pattern is to detect the waiting worker, tell the user an update is ready, and post a message that calls skipWaiting only after they accept a reload.
Source: https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerGlobalScope/skipWaiting
service-workerspwa
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