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<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-type" content="text/html;charset=UTF-8">
<script>
function waitOnWorkerMessage(type) {
return new Promise(function(res, rej) {
function onMessage(e) {
if (e.data.type == type) {
navigator.serviceWorker.removeEventListener("message", onMessage);
(e.data.okay == "yes" ? res : rej)(e.data);
}
}
navigator.serviceWorker.addEventListener("message", onMessage);
});
}
</script>
</head>
<body>
</body>
</html>