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<html>
<body>
<script>
var bc = new BroadcastChannel('start');
bc.onmessage = function(e) {
// This message is not for us.
if (e.data != 'go') {
return;
}
// It can happen that we don't have the registrations yet. Let's try with a
// timeout.
function proceed() {
return navigator.serviceWorker.getRegistrations().then(regs => {
if (!regs.length) {
setTimeout(proceed, 200);
return;
}
bc = new BroadcastChannel('result');
regs[0].update().then(() => {
bc.postMessage(0);
}, () => {
bc.postMessage(1);
});
// Tell the coordinating frame script that we've kicked off our update
// call so that the SW script can be released once both instances of us
// have triggered update() and 1 has failed.
const blockingChannel = new BroadcastChannel('update');
blockingChannel.postMessage(true);
});
}
proceed();
}
</script>
</body>
</html>