window.onload = () => {
	'use strict';
	if ('serviceWorker' in navigator) {
		navigator.serviceWorker.register('sw.js', {
			scope: '/map/'
		}).then(function (reg) { // registration worked 
			console.log('Registration succeeded. Scope is ' + reg.scope);
		}).catch(function (error) { // registration failed 
			console.log('Registration failed with ' + error);
		});
	};
}