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1 <!-- 2 Any copyright is dedicated to the Public Domain. 3 http://creativecommons.org/publicdomain/zero/1.0/ 4 --> 5 <!DOCTYPE HTML> 6 <html> 7 <head> 8 </head> 9 <body> 10 <script type="text/javascript"> 11 12 function wait_until_controlled() { 13 return new Promise(function(resolve) { 14 if (navigator.serviceWorker.controller) { 15 resolve(); 16 return; 17 } 18 navigator.serviceWorker.addEventListener('controllerchange', function onController() { 19 if (navigator.serviceWorker.controller) { 20 navigator.serviceWorker.removeEventListener('controllerchange', onController); 21 resolve(); 22 } 23 }); 24 }); 25 } 26 addEventListener('load', function(event) { 27 var registration; 28 navigator.serviceWorker.register('worker.js').then(function(swr) { 29 registration = swr; 30 31 // While the iframe below is a navigation, we still wait until we are 32 // controlled here. We want an active client to hold the service worker 33 // alive since it calls unregister() on itself. 34 return wait_until_controlled(); 35 36 }).then(function() { 37 var frame = document.createElement('iframe'); 38 document.body.appendChild(frame); 39 frame.src = 'fake_download'; 40 41 // The service worker is unregistered in the fetch event. The window and 42 // frame are cleaned up from the browser chrome script. 43 }); 44 }); 45 </script> 46 </body> 47 </html>