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<!DOCTYPE html>
<script>
function ok(v, msg) {
window.parent.postMessage({status: "ok", result: !!v, message: msg}, "*");
}
var isDone = false;
function done(reg) {
if (!isDone) {
ok(reg.waiting || reg.active,
"Either active or waiting worker should be available.");
window.parent.postMessage({status: "registrationdone"}, "*");
isDone = true;
}
}
navigator.serviceWorker.register("sw.js", {scope: "."})
.then(function(registration) {
if (registration.installing) {
registration.installing.onstatechange = function(e) {
done(registration);
};
} else {
done(registration);
}
});
</script>
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