html head snippet for service worker

html head snippet

        <link rel="manifest" href="/manifest.json">
        <link rel="apple-touch-icon" sizes="512x512" href="icon-512.png">
        <script type="application/javascript">
          if ('serviceWorker' in navigator) {
            navigator.serviceWorker.register('service-worker.js');
          }
          let deferredPrompt;

          window.addEventListener('beforeinstallprompt', (e) => {
            // Prevent Chrome 67 and earlier from automatically showing the prompt
            e.preventDefault();
            // Stash the event so it can be triggered later.
            deferredPrompt = e;
          });
        </script>