This is a sample site of PWA.

You can install this web site as an Application.

if ('serviceWorker' in navigator) {
  window.addEventListener('load', () => {
    navigator.serviceWorker
      .register('/assets/js/sw.js', {scope: '.'})
      .then((registration) => {
        console.log(
          'Successfully registered service worker with scope: ',
          registration.scope
        );
      })
      .catch((err) => {
        console.error('Failed to register service worker with err: ', err);
      });
  });
}

self.addEventListener('install', (event) => {
  console.info('installed');
});

self.addEventListener('activate', (event) => {
  console.info('service worker activated');
});

self.addEventListener('fetch', (event) => {
  console.info('fetch event occurred');
});