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<!-- Any copyright is dedicated to the Public Domain.
<!DOCTYPE HTML>
<html>
<head>
<meta charset="UTF-8">
<title>Service worker test</title>
</head>
<body>
<script type="text/javascript">
"use strict";
let registration;
window.registerServiceWorker = async function() {
registration = await navigator.serviceWorker.register(
"controlled-install-sw.js"
);
window.sw = registration;
};
window.installServiceWorker = function() {
registration.installing.postMessage("install-service-worker");
};
</script>
</body>
</html>