PWA-serviceworker

var superpwa_sw = {"url":"/serviceWorker.js"};
if ('serviceWorker' in navigator) {
	window.addEventListener('load', function() {
		navigator.serviceWorker.register(superpwa_sw.url)
			.then(function(registration) { console.log('PWA service worker ready'); registration.update(); })
			.catch(function(error) { console.log('Registration failed with ' + error); });
	});
}