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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<script>
var reg;
window.onmessage = function (event) {
if (event.data !== "register") {
return;
}
var promise = navigator.serviceWorker.register("worker.js");
window.onmessage = function (e) {
if (e.data === "register") {
promise.then(function() {
return navigator.serviceWorker.register("worker2.js")
.then(function(registration) {
reg = registration;
});
});
} else if (e.data === "unregister") {
reg.unregister();
}
};
};
</script>
</head>
<body>
This is a test page.
</body>
<html>