| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <title>register a service worker</title> | |
| <script> | |
| async function setup() { | |
| await navigator.serviceWorker.register('service_worker.js'); | |
| await navigator.serviceWorker.ready; | |
| return 'ok'; | |
| } | |
| function hasController() { | |
| return !!navigator.serviceWorker.controller; | |
| } | |
| </script> |