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<html>
<body>
<script>
var messageData;
function registerMessage()
{
navigator.serviceWorker.onmessage = (e) => {
if (window.messageData === undefined)
window.messageData = e.data;
}
}
function listenToMessages()
{
messageData = [];
setTimeout(() => {
navigator.serviceWorker.addEventListener("message", (e) => {
messageData.push(e.data);
}, { once:true });
}, 500);
setTimeout(() => {
navigator.serviceWorker.onmessage = (e) => {
messageData.push(e.data);
};
}, 1000);
}
if (window.location.search === "?repeatMessages") {
setTimeout(() => {
registerMessage();
}, 500);
} else if (window.location.search.includes("listener")) {
listenToMessages();
} else {
registerMessage();
}
</script>
</body>
</html>
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