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<!DOCTYPE html>
<meta charset="utf-8">
<title>SharedWorker Fetcher</title>
<script>
window.addEventListener("message", function (evt) {
let { url } = evt.data;
const worker = new SharedWorker(url);
worker.onerror = (evt) => {
parent.postMessage({ error: evt.message || "unknown error" }, "*");
};
worker.port.addEventListener("message", (evt) => {
parent.postMessage(evt.data, "*");
});
worker.port.start();
});
</script>
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