navigator.serviceWorker.ready.then(function(registration) { registration.periodicSync.register({ tag: 'get-latest-news', // default: '' minPeriod: 12 * 60 * 60 * 1000, // default: 0 powerState: 'avoid-draining', // default: 'auto' networkState: 'avoid-cellular' // default: 'online' }).then(function(periodicSyncReg) { // success }, function() { // failure }) });