I try to activate a background-sync, but i run to error when I typing the code. Why can't find it? Should i update something? My code: if ('periodicSync' in worker) { const status = await navigator.permissions.query({ name: 'periodic-background-sync', //ERROR }); // Periodic background sync can be used. if (status.state === 'granted') { const tags = await worker.periodicSync.getTags(); //ERROR if (!tags.includes('sendDbDatas')) { worker.periodicSync.register('sendDbDatas'); //ERROR } } else { // Periodic background sync cannot be used. } } Continue reading...